Year of Pollination: Botanical Terms for Pollination, part two

“The stage is set for reproduction when, by one means or another, compatible pollen comes to rest on a flower’s stigma. Of the two cells within a pollen grain, one is destined to grow into a long tube, a pollen tube, that penetrates the pistil’s tissues in search of a microscopic opening in one of the ovules, located in the ovary. … The second of a pollen grain’s cells divides to become two sperm that move through the pollen tube and enter the ovule.” – Brian Capon, Botany for Gardeners

“Once pollination occurs, the next step is fertilization. Pollen deposited on the sticky stigma generates a fine pollen tube that conveys the sperm through the style to the ovary, where the ovules, or eggs, have developed. After fertilization, the rest of the flower parts wither and are shed as the ovary swells with seed development.” – Rick Imes, The Practical Botanist

Pollination tells the story of a pollen grain leaving an anther by some means – be it wind, water, or animal – and finding itself deposited atop a stigma. As long as the pollen and stigma are compatible, the sex act proceeds. In other words, the pollen grain germinates. One of the pollen grain’s cells – the tube nucleus – grows down the length of the style, forming a tube through which two sperm nuclei can travel. The sperm nuclei enter the ovary and then, by way of a micropyle, enter an ovule. Inside the ovule is the female gametophyte (also referred to as the embryo sac). One sperm nucleus unites with the egg nucleus to form a zygote. The remaining sperm nucleus unites with two polar nuclei to form a triploid cell which becomes the endosperm. The sex act is complete.

The illustration on the left includes the cross-section of a pistil showing the inside the ovary where pollen tubes have made their way to the ovules. The illustration on the right shows pollen grains germinating on a stigma and their pollen tubes begining to work their way down the style. (photo credit: wikimedia commons)

The illustration on the left includes the cross section of a pistil showing the inside of the ovary where pollen tubes have made their way to the ovules. The illustration on the right shows pollen grains germinating on a stigma and pollen tubes as they work their way down the style. (image credit: wikimedia commons)

The zygote divides by mitosis to become an embryo. The endosperm nourishes the development of the embryo. The ovule matures into a seed, and the ovary develops into a fruit. During this process, the remaining parts of the flower wither and fall away. In some cases, certain flower parts remain attached to the fruit or become part of the fruit. The flesh of an apple, for example, is formed from the carpels and the receptacle (the thickened end of a flower stem – peduncle – to which the parts of a flower are attached).

As the seed matures, the endosperm is either used up or persists to help nourish the embryonic plant after germination. Mature seeds that are abundant in endosperm are called albuminous. Examples include wheat, corn, and other grasses and grains. Mature seeds with endosperm that is either highly reduced or absent are called exalbuminous – beans and peas, for example. Certain species – like orchids – do not produce endosperm at all.

The cross section of a corn kernel showing the endosperm and the embryo (image credit: Encyclopedia Britannica Kids)

The cross section of a corn kernel showing the endosperm and the embryo (image credit: Encyclopedia Britannica Kids)

It is fascinating to consider that virtually every seed we encounter is the result of a single pollen grain making its way from an anther to a stigma, growing a narrow tube down a style, and fertilizing a single ovule. [Of course there are always exceptions. Some plants can produce seeds asexually. See apomixis.] Think of this the next time you are eating corn on the cob or popcorn – each kernel is a single seed – or slicing open a pomegranate to reveal the hundreds of juicy seeds inside. Or better yet, when you are eating the flesh or drinking the milk of a coconut. You are enjoying the solid and liquid endosperm of one very large seed.

Much more can be said about pollination and the events surrounding it, but we’ll save that for future posts. The “Year of Pollination” may be coming to an end, but there remains much to discover and report concerning the subject. For now, here is a fun video to help us review what we’ve learned so far:


Also, take a look at this TED talk: The Hidden Beauty of Pollination by Louie Schwartzberg

And finally, just as the “Year of Pollination” was coming to an end I was introduced to a superb blog called The Amateur Anthecologist. Not only did it teach me that “anthecology” is a term synonymous with pollination biology, it has a great series of posts called “A Year of Pollinators” that showcases photographs and information that the author has collected for various groups of pollinators over the past year. The series includes posts about Bees, Wasps, Moths and ButterfliesFlies, and Beetles, Bugs, and Spiders.

Year of Pollination: Botanical Terms for Pollination, part one

When I began this series of posts, I didn’t have a clear vision of what it would be. I had a budding interest in pollination biology and was anxious to learn all that I could. I figured that calling 2015 the “Year of Pollination” and writing a bunch of pollination-themed posts would help me do that. And it has. However, now that the year is coming to a close, I realize that I neglected to start at the beginning. Typical me.

What is pollination? Why does it matter? The answers to these questions seemed pretty obvious; so obvious, in fact, that I didn’t even think to ask them. That being said, for these last two “Year of Pollination” posts (and the final posts of the year), I am going back to the basics by defining pollination and exploring some of the terms associated with it. One thing is certain, there is still much to be discovered in the field of pollination biology. Making those discoveries starts with a solid understanding of the basics.

Pollination simply defined is the transfer of pollen from an anther to a stigma or – in gymnosperms – from a male cone to a female cone. Essentially, it is one aspect of plant sex, albeit a very important one. Sexual reproduction is one way that plants multiply. Many plants can also reproduce asexually. Asexual reproduction typically requires less energy and resources – no need for flowers, pollen, nectar, seeds, fruit, etc. – and can be accomplished by a single individual without any outside help; however, there is no gene mixing (asexually reproduced offspring are clones) and dispersal is limited (consider the “runners” on a strawberry plant producing plantlets adjacent to the mother plant).

To simplify things, we will consider only pollination that occurs among angiosperms (flowering plants); pollination/plant sex in gymnosperms will be discussed at another time. Despite angiosperms being the youngest group of plants evolutionarily speaking, it is the largest group and thus the type we encounter most.

A flower is a modified shoot and the reproductive structure of a flowering plant. Flowers are made up of a number of parts, the two most important being the reproductive organs. The androecium is a collective term for the stamens (what we consider the male sex organs). A stamen is composed of a filament (or stalk) topped with an anther – where pollen (plant sperm) is produced. The gynoecium is the collective term for the pistil (what we consider the female sex organ). This organ is also referred to as a carpel or carpels; this quick guide helps sort that out. A pistil consists of the ovary (which contains the ovules), and a style (or stalk) topped with a stigma – where pollen is deposited. In some cases, flowers have both male and female reproductive organs. In other cases, they have one or the other.

photo credit: wikimedia commons

photo credit: wikimedia commons

When pollen is moved from an anther of one plant to a stigma of another plant, cross-pollination has occurred. When pollen is moved from an anther of one plant to a stigma of the same plant, self-pollination has occurred. Cross-pollination allows for gene transfer, and thus novel genotypes. Self-pollination is akin to asexual production in that offspring are practically identical to the parent. However, where pollinators are limited or where plant populations are small and there is little chance for cross-pollination, self-pollination enables reproduction.

Many species of plants are unable to self-pollinate. In fact, plants have evolved strategies to ensure cross-pollination. In some cases, the stamens and pistils mature at different times so that when pollen is released the stigmas are not ready to receive it or, conversely, the stigmas are receptive before the pollen has been released. In other cases, stigmas are able to recognize their own pollen and will reject it or inhibit it from germinating. Other strategies include producing flowers with stamens and pistils that differ dramatically in size so as to discourage pollen transfer, producing separate male and female flowers on the same plant (monoecy), and producing separate male and female flowers on different plants (dioecy).

As stated earlier, the essence of pollination is getting the pollen from the anthers to the stigmas. Reproduction is an expensive process, so ensuring that this sex act takes place is vital. This is the reason why flowers are often showy, colorful, and fragrant. However, many plants rely on the wind to aid them in pollination (anemophily), and so their flowers are small, inconspicuous, and lack certain parts. They produce massive amounts of tiny, light-weight pollen grains, many of which never reach their intended destination. Grasses, rushes, sedges, and reeds are pollinated this way, as well as many trees (elms, oaks, birches, etc.) Some aquatic plants transport their pollen from anther to stigma via water (hydrophily), and their flowers are also simple, diminutive, and produce loads of pollen.

Inforescence of big bluestem (Andropogon gerardii), a wind pollinated plant - pohto credit: wikimedia commons

Inflorescence of big bluestem (Andropogon gerardii), a wind pollinated plant – photo credit: wikimedia commons

Plants that employ animals as pollinators tend to have flowers that we find the most attractive and interesting. They come in all shapes, sizes, and colors and are anywhere from odorless to highly fragrant. Odors vary from sweet to bitter to foul. Many flowers offer nectar as a reward for a pollinator’s service. The nectar is produced in special glands called nectaries deep within the flowers, inviting pollinators to enter the flower where they can be dusted with pollen. The reward is often advertised using nectar guides – patterns of darker colors inside the corolla that direct pollinators towards the nectar. Some of these nectar guides are composed of pigments that reflect the sun’s ultraviolet light – they are invisible to humans but are a sight to behold for many insects.

In part two, we will learn what happens once the pollen has reached the stigma – post-pollination, in other words. But first, a little more about pollen. The term pollen actually refers to a collection of pollen grains. Here is how Michael Allaby defines “pollen grain” in his book The Dictionary of Science for Gardeners: “In seed plants, a structure produced in a microsporangium that contains one tube nucleus and two sperm nuclei, all of them haploid, enclosed by an inner wall rich in cellulose and a very tough outer wall made mainly from sporopollenin. A pollen grain is a gametophyte.”

A pollen grain’s tough outer wall is called exine, and this is what Allaby has to say about that: “It resists decay, and the overall shape of the grain and its surface markings are characteristic for a plant family, sometimes for a genus or even a species. Study of pollen grains preserved in sedimentary deposits, called palynology or pollen analysis, makes it possible to reconstruct past plant communities and, therefore, environments.”

Scanning electron microscope image of pollen grains from narrowleaf evening primrose (Oenothera fruticosa) - photo credit: wikimedia commons

Scanning electron microscope image of pollen grains from narrowleaf evening primrose (Oenothera fruticosa) – photo credit: wikimedia commons

Botany in Popular Culture: Futurama’s Holiday Spectacular

Matt Groening and David X. Cohen’s animated sitcom, Futurama, is replete with social commentary. Set in the 31st Century, it’s not surprising that much of that commentary involves environmental issues. Episode 13 of season 6 – a special, holiday season episode – addresses a number of such issues, including extinction, global warming, fossil fuel depletion, and Colony Collapse Disorder. The episode is broken up into three, distinct segments; each has its own storyline, but all – apart from being environmentally themed – center around traditional (in the fictional world of Futurama) holiday celebrations. Hence, the title of the episode: The Futurama Holiday Spectacular.

Botany plays a particularly prominent role in the first segment of the episode. In the 31st Century, Christmas has morphed into a holiday called Xmas. In the opening scene, the Planet Express Crew has decorated a palm tree to look like a Christmas tree. Looking despondent, Philip J. Fry (a pizza delivery boy from the 21st century who was inadvertently cryopreserved and thawed 1,000 years later) laments, “Something about Xmas just doesn’t feel like Christmas.”  Just then, the arrival of Santa is announced.

In the 31st Century, Santa Claus has been replaced by a robot called Robot Santa, and instead of gifts and holiday cheer, he brings violence and mayhem. The crew begins to lock down the Planet Express headquarters in preparation for Robot Santa’s arrival. Disturbed by this, Fry demands to know how “this crazy holiday” is celebrated – “preferably in song.”  At which point, Robot Santa bursts out of the fireplace singing, “It’s the violentest season of the year…”

robot santa

After a few violent exchanges between the crew and Robot Santa, Robot Santa sings, “The one thing that you need to make your Xmas Day splendiferous / Is a pine tree – a pine tree that’s coniferous.” The crew agrees; they need “an old-fashioned pine tree.” But there is one problem.

“Pine trees have been extinct for over 800 years,” explains Professor Farnsworth. Apparently, they were all chopped down and turned into toilet paper during something called “The Fifty-Year Squirts.” Yet, the Professor exclaims, “There is one hope and, as usual, it’s Norwegian!” And at that, the crew heads off to Norway.

In Norway, the crew arrives at the Svalbard Global Seed Vault where, as the Professor explains, “since 2008, the vault has preserved seeds of every known plant species in case of extinction.” They are confronted by a seed vault employee who asks why the crew is “pokey-poking about the seed vault – guardian of mankind’s precious botanical heritage there?”

The Professor tells the man that they are there to “rummage about a bit.” The crew notes that there is a Germ Warfare Repository that has been constructed right next to the seed vault and asks if there are any cross-contamination concerns. The man says, “No,” and then lets them inside where he brings them a container marked Pinus xmas. Amy notices some “splork” on the seeds and asks, “It’s not germs is it?” Again the man says, “No.” 


The Planet Express crew at the Svalbard Global Seed Vault being presented with the seeds of Pinus xmas.

Back in New New York, Fry plants a pine tree seed outside the Planet Express building. A year later, a sapling as tall as Fry has emerged. Fry declares, “Now that’s a tree worth chopping down.” At that point, President Nixon pulls up in his limousine and sees the tree. “That’s what my poll numbers need, ” he says turning to Vice President Cheney – both of them animated heads in jars. Cheney orders Nixon to steal the tree.

The tree is transplanted in front of the White House. During the Xmas tree lighting ceremony, the tree begins to grow rapidly. Apparently it was contaminated with a weaponized virus after all. It begins to produce cones which then fly off the tree and explode. Shortly after the explosions, more pine trees begin to emerge and grow rapidly, at which point Leela exclaims, “Wait! This could be a good thing. Reforestation has begun!” However, this reforestation is occurring at an extremely rapid pace, and before long all land on Earth is completely covered in pine trees.

Soon, all manner of wildlife is found frolicking among the trees. Again Leela exclaims, “Arguably, this could be a good thing. The planet has returned to its primeval state!” The Professor concurs, “All these pine trees are fighting global warming by producing oxygen.”

But the “good news” doesn’t last long. The oxygen level continues to increase and quickly reaches 80%. Ignorantly, Bender decides to celebrate his own laziness with a cigar. As he lights it, the entire planet bursts into flames. Robot Santa returns to announce, “Ho ho ho! Everyone’s dead!”


Similar dark comedy ensues in the other two segments as the crew learns about the holiday traditions of Robanukah and Kwanzaa. Again, both segments explore important environmental concerns in the process. Al Gore’s animated head in a jar makes appearances throughout the episode. If you are looking for some added hilarity during this holiday season – as well as some bleak environmental messaging – you can’t go wrong with Futurama’s Holiday Spectacular.

Interesting fact: In 2011, this episode of Futurama won an Environmental Media Award for best comedic television episode with an environmental message. EMA’s have been awarded since 1991 to “honor film and television productions and individuals that increase public awareness of environmental issues and inspire personal action on these issues.”

Harvester Ants – Seed Predators and Seed Dispersers

“The abundance of ants is legendary. A worker is less than one-millionth the size of a human being, yet ants taken collectively rival people as dominant organisms on the land. …  When combined, all ants in the world taken together weigh about as much as all human beings.” – Journey to the Ants by Bert Hölldobler and Edward O. Wilson

Considering how abundant and widely distributed ants are, it is easy to imagine the profound role they might play in the ecosystems of which they are a part. In fact, in the epilogue to Hölldobler and Wilson’s popular book about ants (quoted above), they conclude that in a world without ants, “species extinction would increase even more over the present rate, and the land ecosystems would shrivel more rapidly as the considerable services provided by these insects were pulled away.” It is no doubt then that ants, through their myriad interactions with their surroundings, are key players in terrestrial ecosystems.

photo credit:

photo credit:

Harvester ants offer a prime example of the important roles that ants can play. In the process of collecting seeds for consumption, harvester ants can help shape the abundance and distribution of the plants in their immediate environment. They do this by selecting the types and amounts of seeds they collect, by abandoning seeds along their collection routes, and by leaving viable seeds to germinate in and around their nests. Hölldobler and Wilson have this to say about harvester ants:

[The] numerical success [of ants] has allowed them to alter not just their nest environments, but the entire habitats in which they live. Harvesting ants, species that regularly include seeds in their diet, have an especially high impact. They consume a large percentage of the seeds produced by plants of many kinds in nearly all terrestrial habitats, from dense tropical forests to deserts. Their influence is not wholly negative. The mistakes they make by losing seeds along the way also disperse plants and compensate at least in part for the damage caused by their predation.

There are more than 150 species of harvester ants, spanning at least 18 genera. They are found throughout the world (except extreme cold locales) and are particularly common in arid to semi-arid environments. Pogonomyrmex is one the largest genera of harvester ants with nearly 70 species occurring throughout North, Central, and South America. Messor is another large genus of harvester ants that mainly occurs in Europe, Asia, and Africa. Both of these genera build large nests and move massive amounts of soil in the process.

Seed dispersal by harvester ants (also known as diszoochory) is a type of secondary (or Phase II) seed dispersal. It is a case of serendipity, as the dispersal occurs largely by accident. Some plants, on the other hand, have developed a mutualistic relationship with ants, enlisting them to disperse their seeds by way of an elaiosome – a fleshy, nutritious structure attached to seeds that attracts ants. Seeds with such structures are picked up by ants and brought to their nests where the elaiosome is consumed and the seed is left to germinate. This form of ant-mediated dispersal is called myrmecochory and is typically not carried out by harvester ants.

photo credit: wikimedia commons

photo credit: wikimedia commons

Harvester ant colonies have both direct and indirect influences on their surrounding environments; however, there is a dearth of research elucidating the exact details of such influences. A paper published in the Annual Review of Ecology and Systematics in 2000 by MacMahon et. al. reviewed available studies concerning harvester ants and explored our current understanding of the influences that harvester ants (particularly those in the genus Pogonomyrmex) can potentially have on community structure and ecosystem functions. Following are some of the direct influences the authors listed:

  • Removal and consumption of seeds and other materials – The relative abundance of plant species can be affected by the selective removal of seeds. Harvester ants also collect leaves, twigs, pollen, flowers, vertebrate feces, and arthropod body parts.
  • Storage and rejection of seeds – Collected seeds can be dropped during transport, rejected after arriving at the nest, or abandoned in nest granaries. All result in the transport of seeds away from the parent plant and dispersal beyond the plants’ primary dispersal mechanisms.
  • Construction and maintenance of nests – All vegetation and debris is removed from the area immediately surrounding the nest including mature and emerging plants. This area is kept clear for the duration of the life of the colony and, in some cases, can be quite extensive.

Harvester ants can also influence soil properties and soil food webs within and in the vicinity of their nests. They bring large amounts of organic matter down into the soil and redistribute vast amounts of soil particles. Their actions also influence the amount of moisture in the soil surrounding their nests.

This is a mere distillation of the influences that harvester ants might have; see the paper by MacMahon et al. to learn more.

In an effort to better understand how the seed predation and seed dispersal behaviors of harvester ants might influence plant population dynamics, a research team in Spain used data obtained from field research to build a computer model that would predict changes over time. The study site was described as “open and heterogeneous shrubland” and the vegetation was stated to be in “a very early stage in the secondary succession” after being subject to “recurring fires.” The harvester ant colonies involved in the study consisted of three species in the genus Messor. The plant species selected for the study were three native shrubs whose seeds were known to be collected by the harvester ants. Each plant species differed slightly in the amount and size of seeds it produced and in its primary seed dispersal mechanism, which is important because the researchers hypothesized that “the effect of seed predation and seed dispersal may depend on plant attributes.”

Messor bouvieri (photo credit:

Messor bouvieri (photo credit:

Data obtained from simulated scenarios and field observations appeared to support this hypothesis; each shrub species interacted differently with the harvester ants. Coronilla minima benefited from “accidental” seed dispersal. Comparatively, it produces a high amount of large seeds, which are primarily dispersed by gravity. Despite predation, ant-mediated dispersal was an advantage. Dorycnium pentaphyllum produced the highest amount of seeds among the three shrub species; however, seed predation was found to have negative effects on its population dynamics. Its primary seed dispersal mechanism involves ballistics (the mechanical ejection of its seeds), so ant-mediated dispersal may not offer an advantage. Finally, Fumana ericoides, despite its limited primary seed dispersal and its comparatively low production of seeds was not affected by the actions of the harvester ants. The authors concluded that “some unknown factor is driving the population dynamics of this species, more than the action of ants.”

Studies such as this, while leaving many unanswered questions, help us understand the important role that harvester ants play in our world. Harvester ants, and ants in general, are truly among Earth’s most enthralling and influential creatures. Learn more about their complex behaviors and countless interactions with flora and fauna by checking out these three documentaries recommended by ANTfinity.

Artificial Photosynthesis – A Case of Biomimicry

Humans have long sought solutions to their problems by observing nature and trying to mimic it. These endeavors have lead to improvements in the designs and production processes of countless things. In recent decades there has been a growing movement composed of scientists, engineers, and innovators of all types to expressly seek for answers to today’s most pressing problems by deeply observing and analyzing the natural world. These efforts are coupled with a desire to learn how to work with nature rather than against it in an attempt to secure a more sustainable future for life on Earth. This is the essence of biomimicry.

To this end, plants have much to teach us. Everything from their basic forms and functions to the way they fight off pests and diseases to the way they communicate with each other is worth exploring for biomimicry purposes. A plant-based phenomenon that has probably received the most attention – and for good reason – is photosynthesis, the process that enables plants to use the sun to make food.

Put another way, photosynthesis is the process of converting light energy into chemical energy. Specialized proteins in plant cells absorb particles of light which initiates the passing of electrons across a series of molecules. Subsequently, water is split by a protein complex into oxygen and hydrogen protons. The oxygen is released from the plant, while the electrons and hydrogen protons go on to help generate two compounds – NADPH and ATP – which are later used to power the reaction that transforms atmospheric carbon dioxide into sugars. The concept of photosynthesis, while fairly simple to grasp from a high level (i.e. light + water + carbon dioxide = sugars + oxygen), is actually quite complex, and there is still much too discover concerning it.

photo credit: wikimedia commons

photo credit: wikimedia commons

One thing is certain, photosynthesis is ubiquitous. As long as the sun is overhead, most plants, algae, and cyanobacteria are photosynthesizing at a steady clip and are thereby helping to power just about every other living organism on the planet. Without plants, most of the rest of us could not survive. Janine M. Benyus offers this human-centric view in her book Biomimicry:

Consider that everything we consume, from a carrot stick to a peppercorn filet, is the product of plants turning sunlight into chemical energy. Our cars, our computers, our Christmas tree lights all feed on photosynthesis as well, because the fossil fuels they use are merely the compressed remains of 600 million years worth of plants and animals that grew their bodies with sunlight. All of our petroleum-born plastics, pharmaceuticals and chemicals also spring from the loins of ancient photosynthesis. … Plants gather our solar energy for us and store it as fuel. To release that energy, we burn the plants or plant products, either internally, inside our cells, or externally, with fire.

Since plants are so well-versed in using sunlight to create food and energy, it only makes sense that we would look to them to learn how we might improve and expand upon our quest for renewable energy production. We already use the sun to produce electricity by way of photovoltaic systems; however, these systems are limited in that they can only produce electricity when the sun is shining, and electricity is difficult to store. Artificial photosynthesis involves using that electricity to power catalysts that can split water into hydrogen and oxygen. The hydrogen can be used as a fuel or can be fed into reactions involving carbon dioxide, ultimately resulting in a carbon-based fuel source. Fuels produced this way – referred to as solar fuels – could be stored and used regardless of whether or not the sun is out.

Artificial photosynthesis has largely moved beyond the theoretical stage. Multiple efforts have demonstrated ways in which water can be split using the light of the sun and solar fuels can thereby be produced. Mass production is the next step, and that is where the real limitations lie. The production of solar fuels has to be done cheaply enough to compete with other available fuels, and the infrastructure to use such fuels has to be available. These hurdles may very well be overcome, but it will take time. Meanwhile, research continues, adding to the mountains of studies already published.

photo credit: wikimedia commons

photo credit: wikimedia commons

On such study published in 2011 describes an “artificial leaf” that was developed at the Massachusetts Institute of Technology by Daniel Nocera and a team of researchers. Listen to an interview with Nocera on Science Friday and watch this BBC Worldwide video to learn more about this discovery. This Nature article explains why the artificial leaf is not yet commercially available, and why we are not likely to see it any time soon.

Another development in artificial photosynthesis was published earlier this year in Nano Letters. It is the product of Peidong Yang and the Kavli Energy NanoSciences Institute. While Nocera and his team stopped at the production of hydrogen gas, Yang’s lab added bacteria to the mix and were able to use the sun’s energy to transform carbon dioxide into acetate. If passed along to another species of bacteria, the acetate could be used to produce various synthetic fuels. Learn more about this by reading this livescience article and watching this FW: Thinking video. As with other artificial photosynthesis developments, limitations abound, but the research is promising.

Artificial photosynthesis is a compelling subject and one worth keeping an eye on. Follow the links below to learn more:

Biomimicry is an equally compelling subject and one I hope to explore further in future Awkward Botany posts. Meanwhile, check out these links: