Showing posts with label bee pollination. Show all posts
Showing posts with label bee pollination. Show all posts

Tuesday, July 14, 2015

You Don't Have to See It to Notice It: Wood Nymph, Moneses uniflora, Pyrole à une fleur

In my meanderings at the lake (my parents's property in the Upper Gatineau), I came across some Moneses uniflora (aka wood nymph, oneflower wintergreen, single delight, & many other names) that was well-placed for some photos.

Moneses uniflora
For those familiar with the property, it grows fairly abundantly in the cedar bush. Today's shots were taken by the metre-deep pond.

For those unfamiliar with the property, this plant is native to and found in temperate, moist coniferous forests in the Northern hemisphere [1] and was thus quite predictably found in an area where the water table is quite high (we know of at least one spring letting out in the area; the place is crisscrossed with little streams and puddles and is always very damp; it is not a place you walk if you plan to keep your feet dry), and which is populated primarily by Thuja occidentalis (white cedar). This is its native and natural habitat.

The pictures were taken quite close up (I had to lie down on the ground to take it and rose predictably quite damp as a result), so the size of the plant is not immediately obvious. In spite of its reasonable stature in the photos, Moneses uniflora is actually a very small, unpreposessing flower; the one I photographed here appeared to be quite typical of the population and was no more than 3 or 4cm high, though some sources seem to indicate that it can grow as big as 6 inches tall [2] (this may be more likely in warmer climates with longer growing seasons).

Moneses uniflora side view ; note the prominent pistil

It is very likely that people have walked by this plant many times without ever noticing it, small and plain as it is. But though people may walk by without taking note of it, it is possible that they still perceive its presence. It isn't visually dramatic, but it produces a strong and very pleasant fragrance [2] that, where it grows abundantly, sweetens the air. The scent of this flower is part of the sweet, moist, earthy smell I associate with the cedar bush.

The strong fragrance of the flower is attractive to bees, but the plant is in this respect deceptive; they will find no nectar in these flowers [2]. Nevertheless, the bees are able to collect pollen, which rather than being borne on the surface of the anther, is actually inside it. There is a pore at the tip of the anther through which pollen will fall when a bee shakes the anthers by vibrating its wings [2], thereby shaking the pollen loose -- this is called buzz pollination (which is a fascinating topic for another post).

Moneses uniflora
From a North American perspective, Moneses uniflora is native to much of the continent (US range map here, Canada range map here). It is endangered in Connecticut and Ohio, and threatened in Rhode Island [3]. It is secure in most of its native Canadian range, except Nunavut where it may be at risk and Newfoundland & Labrador, where its status has not been assessed [4].

A few sources suggest the Moneses uniflora's potential medicinal use against colds [2,5] and as an antibacterial agent [2].

Because of my mother's musical predilections, I associate all this summer heat with the Tragically Hip, whose music my mother frequently played when we were driving up to the lake. Here's to the beauty of a Canadian summer. I hope you all are able to make the most of it.

Monday, June 2, 2014

Trilliums - Trillium spp. - Trilles

Trillium erectum (red trillium, fr: trille rouge) and Trillium grandiflorum (white trillium, fr: trille blanc) are common sights in Quebec and Ontario in the early spring. The Trillium genus is in the Lilaceae family based on genetic evidence, though it used to be listed in a separate family and in spite of the fact that it displays a few characteristics which are slightly odd for the Lilaceae family (eg distinct sepals).

All Trillium spp. are myrmecochorous (see yesterday's post for discussion of myrmecochory), spring ephemeral, herbaceous perennials with thick rhizomes, and also display the distinctive sets of three in their morphology which make the trilliums so recognizable. There is a popular theory that Trillium spp. seeds have been dispersed wide distances (post-glacial expansion) by deer herbivory; I would comment only that deer herbivory and myrmecochory shouldn't generally go hand-in-hand as dispersal mechanisms, as myrmecochory is metabolically expensive and we would expect an advantage to the loss of this dispersal system if an alternative were available to the plant.

T. grandiflorum is the provincial flower of Ontario. It is primarily bee-pollinated and its seeds ant-dispersed.

T. grandiflorum in Gatineau Park
In Quebec at least, T. grandiflorum appears to form these vast colonies of thousands upon thousands of individuals. This photo shows a carpet of the flowers extending as far as one can see. In spite of a certain amount of concern over habitat losses and commercial collection for gardening, this species is listed as secure in Canada. Note, however, that it is listed as endangered or vulnerable in the US.

T. grandiflorum - with distinctive sets of 3 (leaves, sepals, petals)
T. grandiflorum flower
T. erectum, unlike T. grandiflorum, is not bee-pollinated. Instead, it is fly-pollinated. This is why it has a distinctly unpleasant odour (usually likened to wet dog); this odour attracts the flies which pollinate the species.

T. erectum flower with distinctive sets of 3
T. erectum is listed as secure in Canada, but, like T. grandiflorum, is listed as endangered, vulnerable, or threatened in the US.

T. erectum flower
I've always had a particular fondness for the red trillium, which is the only one of these two which grows at the lake (the property doesn't have any suitable places for T. grandiflorum)

T. erectum