You put your left flower in, you take your left flower out...

Species name: Physostegia virginiana

Common name: obedient plant

Location: Western University campus

I didn't realize until after I had taken and water-marked these photos that I had already blogged about this plant once. If you'd like to go back and read the first version, you can do so HERE. If you'd like to read a "better than the last" version, keep reading! :)

The obedient plant is one cool plant. Endless hours of entertainment if you're lost in a prairie (more on that later). The native range of this tiny plant is quite impressive, ranging from the northernmost edge of the temperate forest in Canada all the way south to parts of the (very small bit that's remaining) tropical forests of Mexico. If grown in Canada it illustrates the reason why I should have made the species status diagrams with a "common, native, invasive species" combination because it spreads very quickly and can dominate a landscape in just a few years. Where there is snow during the winter the plant will die off, but because of the extensive underground network of rhizomes it will pop back up in the spring and produce more of the beautiful flowers. If you're thinking of planting this species in your garden, then go ahead and do so if you live in my area. It's a native species, and it's never a bad idea to plant a native species! You might want to reconsider, however, if you have an intense aversion to weeding (it will spread, trust me) or if your yard backs onto an Environmentally Significant Area. For those locations, even the slightest change in dominant species (such as providing a source for a seed bank of a weedy, although native, species) could spell disaster for the area. Always make sure you keep in mind what is around you before making major changes to the landscaping in your yard.

This species is one of the best examples of a member of the mint family, or the Lamiaceae. The stems of this family are almost always square, while nearly all other plant stems (the notable exception are the sedges) are round in cross-section. You can see the ridges of the square stems of this plant clearly in the third picture, above. The leaves are also characteristic of the mint family: they are simple leaves with teeth (some members of the mint family have leaves with smooth edges) that emerge from the stem directly across from each other. The next node up (or down) on the stem will also have opposite leaves but they will be at right angles to the previous level of leaves. You can also see what I mean by this in the third photo. The flowers are also very characteristic of the mint family, although different varieties of this plant have been modified in different ways (sometimes quite drastically) to be different than the so-called "wild type." A wild type plant is a plant that would be found growing in the wild without having experienced any intervention by horticulturalists (or, in the case of edible plants, farmers). The group of plants above are pretty characteristic of the wild type of this species: purple-pink flowers, the flower petals are joined at the bottom and form a structure that looks like two lips at the edge of the flower, darker purple or purple-pink splotches on the bottom lip, and the sexual parts (most noticeable being the stigmas) being attached to the top lip of the flower. This "two lip" morphology isn't done just by chance by the plant; it's actually a flower shape that has co-eveolved with the choice pollinator of this species: bees. Something that you may or may not be aware about bees is that they can't see colours like we see colours. Everything green looks a very dark blue to them, so picking out flowers from a sea of blue-black is difficult, especially when you can't see them. Bess are special, though, because they can see a wavelength of light that we can't see: ultraviolet light. This means that anything that's purple, or even purple-pink, will glow when a bee looks at it. The flowers themselves aren't quite purple, so merely act as lightly glowing beacons in the sea of blue-black plant material. This is enough to entice the bees over, but the dark purple patches on the lower lips of the flower is what really brings the bees over. The bees see the structure of the flower, and use the lower lip of the flower like a landing pad (those darker splotches would be like the landing lights that pilots use to land planes on runways at night). The bee would wiggle around, trying to get its head as deep into the flower tube as possible to access all of the yummy nectar. This would cause the bee's back to rub up against the stigmas of the flower (located on the top lip, which you can see in the fourth and fifth pictures above), which would dust pollen all over the bee's back. Once the nectar is gone, the bee would fly to the next flower, do the same thing, and transfer all of the pollen from its back onto the stigmas of the next flower, ensuring successful cross-pollination. Sneaky little flower! But also quite a smart little flower.

So why is this plant called the "obedient" plant? Well...it stays where you put it. Huh? The flowers actually have the ability to swivel around the flower stalk, and when the flowers swivel into a new position they stay that way. Check it out below:

In the top photo all of the flowers are pointing towards the ground, which is actually pretty common in this species once the flower heads flop over (often they grow too quickly for their own stems to support them if conditions are ideal). In the bottom photo I took two of the flowers by the base and swivelled them around to point straight up. They'll stay that way for up to a minute, then flop back to their original position. If you give the flowers a break, you can move them back and forth multiple times before the plant will just give up on those flowers and dissolve them off the flower stalk. Only the best are allowed to set seed!

The less majestic grey-headed coneflower

Species name: Ratibida pinnata

Common name: grey-headed coneflower

Location: Ontario

This is one of our many native species of wildflowers that prefers very dry clay-rich soils. At one point it was widely distributed across North America with its native range being from Ontario all the way south to the Gulf coast and all the way east to the Atlantic coast. This plant was recently declared extirpated in the wild from Pennsylvania state, and I'm sure there will be other states that will quickly follow suit. The native habitat of this species of flower is very quickly disappearing (large expanses of prairies have all but disappeared from Ontario with few exceptions) and soon the plant itself will follow. The only saving grace about this plant is that it has recently been added onto gardening lists as a desirable species to have in a butterfly and bee garden as they are preferred nectar and pollen sources for these species of insects, so gardeners are bringing them back in large numbers in Ontario and the United States. This doesn't quite count to "un-extirpate" a species, as it must be able to colonize and sustain a population in the wild to be considered "present".

Aside from an ornamental use, it has no known uses to humans. There has been one documented case of a historical use of the roots of this plant used as a treatment for toothaches when crushed, but the plant is no longer used for this purpose. That would probably suggest that either modern dentistry and pharmacology do the trick, or that this plant relied on the placebo effect and wasn't actually effective against aches and pains of any origin.

Bloodroot: a native North American wildflower

UPDATE: Mi compadre (aka my friend) Aaron alerted me to a very interesting experimental application of this plant in controlling another plant I blogged about, garlic mustard (see, even I'm learning things while writing this blog!). When bloodroot rhizomes are over-planted very densely where garlic mustard is prevalent (especially in shady areas) it can out-compete it for resources, and gradually it starts to die off. A fantastic idea of using native plant species in environments where they naturally thrive to eradicate invasive weeds. Brilliant!

Species name: Sanguinaria canadensis

Common name: Bloodroot, bloodwort, red puccoon root, pauson

Location: Ontario

Bloodroot is a species of native North American wildflower that grows from Nova Scotia to Ontario, and further south in the United States down to Florida and Mississippi. It flowers usually from March to May when the ground is still quite cold, and can grow in a wide variety of soil types (but preferring sandy soils, as in the first photo).

This plant was originally used in Native American medicine as a treatment for breathing problems and as an emetic. The roots were cut into small pieces, and then steeped in hot water like to make tea. The tea would then be consumed. I wouldn't recommend that today, since we now know that bloodroot is a poisonous plant, and topical application can lead to intense pain and scarring. The dark side of this plant's "medicinal" use today is as on of the USA's "187 cancer 'cures' consumers should avoid". It seems like if a plant produces any kind of effect on the body, someone will try to pass it off as a cure for cancer. For bloodroot's case, the roots have been made into a paste and sold as a cure for skin cancer and breast cancer, leading to massive deformation and pain in both circumstances. The lesson to be learned here is that just because it's "natural" doesn't mean it's good for you!

Today, this plant is still used for its roots, but not in a medicinal sense. The roots really are red, and really do "bleed" like you would expect from its name. This is of great use as a natural red dye for fabrics and plastics or as a paint (but again should not be added to food products because of the danger it poses).

The reproduction of this plant and the way that it relies on animals is one of the most fascinating in the plant kingdom. The fleshy surrounding of the fruit attracts ants, which carry away the seeds into their underground colonies. The ants will feed on the fruit, leaving the seed intact because it has a very tough and thick seed coat. The ants probably feel it's not worth the effort to try to break through the seed coat. Once ants are done with the fruit, they carry the seeds into their "waste rooms" in their colonies to discard of them. This puts the seeds in a nutrient-rich environment, where they will stay until the next spring. They grow out of the soil, and start their life anew. This type of symbiosis with ants for seed dispersal is called myrmecochory.

Despite this incredibly complex association with ants, most of the bloodroot plants you see in one area are not grown from seed. These plants also produce an underground storage tissue called a rhizome (think of ginger; that's a rhizome) from which a new sprout can form and emerge above-ground. Every year the sugars the plant produces in the leaves are shuttled down to the rhizome where they are converted into starch and stored for the next year's growth. Every "patch" of bloodroot in an area are produced from this underground rhizome network, not from seeds. Since the plant is then no longer relying on external inputs for growth (instead breaking that starch back down into sugar and using that to grow), they can grow much earlier in the season than other plants around it.