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| Yellow Ladyslipper in Virginia Forest |
Yesterday my friend Linda and I went out to hike at the
Thompson Wildlife Management Area in Virginia. This is one of the richest places in our area for spring wildflowers, and one particular portion, with its spectacular display of
Trillium grandiflora that extends for acres, is known as the Trillium Trail (previous postings about it
here and
here ).
We hadn't visited the Trillium Trail for a couple of years, and with this year's unusually warm spring putting our season two weeks ahead of a normal year, I was fairly sure the trillium display would be over by now.
We found some fading trillium flowers in small patches here and there (the white flowers turn pink as they age), but the main reason I wanted to make the trek was to find some yellow ladyslipper orchids for my botanical studies. The yellow ladyslipper seems to be prospering at this site, and my impression is that each year I've visited there are more flowers to be found.
I'd brought my sketchbook and pocket magnifier to make some field sketches of the flower's reproductive parts, but what exactly these were in this species, and in orchids in general, I wasn't really sure. I hoped direct observation would help clear up the mystery.
All flowers need pollinators to set seed, and orchids have evolved some of the most unusual strategies to accomplish this. Some orchids mimic bees or moths to attract specific pollinators, but in the case of the ladyslipper, the pouch forms a trap for the insect. The flowers produce nectar to attract the insect, presumably some kind of bee small enough to fit through the opening. In order to get out, the insect must crawl up towards that small protuberance you see in the photo, called the staminoide. Under the staminoide you can barely see two tiny pollen sacs, the anthers, which will drop their pollen on the insect to transfer it onto the stigma.
I was lucky to find some decaying flowers where these parts were clearly visible. I was also fascinated to learn from my on-line
research that the seeds have a very tough outer covering and need the help of mycorrhizal fungi to germinate and get nourishment during the early part of their life cycle. No wonder they are flourishing here--there is plenty of fungi all over this forest.
The young corm may not develop a true leaf for several years, but as it develops into a rhizome and produces more leaves, eventually it will no longer depend on the fungi. A plant may take up to sixteen years to produce its first flower, but they are long-lived plants.
I'll want to come back in mid-summer to see what the seed pods look like, and how many of the flowers have set seed. The secret sex life of these lovely orchids is fascinating!
