On a recent trip to Vermont, Pink Lady’s Slipper orchids (Cypripedium acaule), also called Moccasin Flower, were just emerging from their winter blanket of leaves, shyly raising their showy pink blossoms, some still partially obscured by the protective sepal and bract draped over the flowers from above.
Each of these lovely orchid plants has two deeply-veined leaves at its base, from which a single flower stem emerges, topped by a spectacular pink slipper (or moccasin) shaped flower.
Lady’s Slipper orchids have three petals, one that forms the ‘slipper’, while the other two are shaped like slightly curly ribbons or ties, positioned just above the slipper in the perfect location to secure it around a slender ankle. One sepal projects directly above the slipper, adding to the floral display, while two more sepals are fused and extend down the back of the flower. The sepals acted as bud scales protecting the flower before it opened.
Pink Lady’s Slippers invest a lot of energy to produce these lovely flowers to entice pollinators to assist with the cross pollination that the plants are unable to achieve on their own. In addition to their alluring appearance, the flowers produce a mild scent to add to the attraction for insect pollinators. Insects are not altruistic, however. They expect a reward in return for their efforts, in the form of nectar and pollen.
Veining on the flower adds to the attraction, and helps steer potential pollinators to the flower’s entrance at its front. The entrance is also typically highlighted with striping that acts as a directional signal (or nectar guide) for floral visitors.
The most likely pollinators for Pink Lady’s Slipper are queen Bumble Bees of several species. These bees have the strength required to muscle their way through the narrow slit that offers access to what they anticipate will be a floral reward.
Once inside, however, bees may begin to have second thoughts about the enterprise. The entrance to the flower is one way. They can’t exit the same way they entered, because the edges of the entryway are curved inward, making an exit impossible. They are trapped inside until they find a different way out, one engineered by the plant to require traversal of a snug passage past the flower’s reproductive parts. The flower’s pistil (female reproductive part) and two fertile stamens (male reproductive parts) are tucked behind the shield-shaped flower part pointing downward at the back of the slipper. This flower part is a modified stamen, called a staminode.
Hairs inside the slipper direct the hapless bee toward the back of the slipper, its reproductive parts, and finally the flower’s exits. There are two possible exits, one on each side of the staminode, and each partially obstructed by an anther from which pollen is dispensed. To get to an exit, the bee first has to brush against the flower’s stigma at the tip of the pistil. This is the spot where pollen must be placed in order for pollination to occur. If the bee is bringing in pollen, it will be deposited on the stigma as the bee squeezes past it. The exits are within sight now, but before reaching one, the bee will brush against an anther, from which a pollinium (a package with thousands of tiny grains of pollen) will be attached to its back. Then, freedom!
Throughout this adventure, no nectar was provided to the flower’s visitor. Pollen is an important food for bees, but when it is packaged in pollinia as it is in the Lady’s Slippers, it isn’t accessible for bees to eat. The bees visiting these flowers are seduced by false advertising into assisting the Pink Lady’s Slipper with cross-pollination, but they receive no reward for their efforts. Hopefully, they’ll attempt the quest for food again with another Pink Lady’s Slipper, but it may not take many visits before a bee gets wise to the deception, and stops visiting these flowers.
If Pink Lady’s Slipper’s duplicitous plot succeeds and pollination takes place, a fruit capsule will develop, like those in the photo below. Making the most of this success, each capsule contains thousands of dust-like seeds. In order to obtain the soil nutrients it needs to germinate and grow, each seed needs to find a fungus of the genus Rhizoctonia with which to partner in the location where it lands. Without this partnership, the seeds won’t be viable, and the plant won’t develop. The fungus must be present throughout the Pink Lady’s Slipper’s life to enable the plant’s survival. In return, when the plant is mature enough, it will provide payment to the fungus in the form of carbohydrates.
Pink Lady’s Slipper is also capable of sending up additional shoots from its rhizome (underground stem), so you may sometimes see it growing in large groups, or colonies.
The color of the slipper can vary from a deep to pale pink, sometimes even white.
Pink Lady’s Slipper is found in acidic soil in various habitats including deciduous woods or mixed forests of hardwood and coniferous trees, often with pine or hemlock, and in bogs. It is native in Canada in the Northwest Territories and from Alberta to Newfoundland, in the United States from Minnesota to Maine, then south as far as Alabama and South Carolina.
Look for it blooming near you!
Yellow Lady’s Slipper – Like Winning the Lottery
USDA Forest Service – Plant of the Week
North American Orchard Conservation Center
Orchids of the North: the life of the Pink Lady’s Slipper
Davis, Richard W. The Pollination Biology of Cypripedium Acaule (Orchidaceae)
Flora of Newfoundland and Labrador
Mary Anne, thank you for sharing these beautiful photos! Very interesting article!
Thank you, Linda! I’m glad you enjoyed it.
As always, I learn so much from your posts! And your photographs are spectacular! Thanks so much for sharing your knowledge
Thanks, Audrey! It was nice to see you at the Justice Center today! Hope to see you soon.
As ever, this post was both lovely to look at and fascinating. Thank you! I’m so surprised that the orchid makes the bee’s trip through the flower so unproductive — yet somehow the bee nonetheless tries it again with other lady’s slippers, hence pollinating them. You’d think the bees would catch on. It’s tough being a bee.
I have to believe that it doesn’t take long for the bees to learn to avoid these lovely flowers. But each year there are new bees, and they each have to learn the lesson for themselves, so some flowers do get pollinated. I’m glad you enjoyed the post!
Mary Anne, your pictures are incredible. You have taught me so much for about these flowers. I am amazed how the stripping helps direct insect visitor. We have always felt so blessed to have a place nearby where we can go to enjoy the Lady’s Slippers in the spring. Both Showy and yellow bloomed in the same area but over the last few years we’ve only been finding the yellow lady slipper so seeing your detailed pictures of the pink moccasin slippers was a special treat.
Wonderful story and the photos are gorgeous. Great to see so many pics .. thank you!
I’m glad you enjoyed it!
Thank you for the fascinating tale of this beautiful pink flower. The photos are a beautiful treat. I will be on the lookout.
How interesting to see these in the wild. Do you shoot with a 100mm macro?
Hi Maria, Most were with a 180 mm macro lens.
Very nice! Thanks for great post!!
Thanks for this interesting post on the Pink Lady’s Slipper and its fascinating life history! Your photos are really beautifully illustrative.
Thank you, Juanita!
Amazing photographs as always!!! Very clear, interesting information as well. Thank you Mary Anne!
I’m glad you enjoyed it, Pam!
Thank you Mary Anne for a most specularly photographed and very detailed explanation of the intricacies of this lovely flower. The best I have ever read about it.
Michael W. O’Brien
Thank you, Michael! I’m glad you enjoyed the post.