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Archive for June 6, 2018

Lady Slippers & Resupination

6-6-18 inverted pink lady's slippers by Sue WEtmore DSCN3871 (002)There is just as much learning, or more, going on at my end of this blog as there is at the readers’. A Vermont naturalist recently sent me a photograph of an upside down Pink Lady’s Slipper (Cypripedium acaule). Over 50 years in the field and I have never come across this phenomenon, nor was I familiar with the process that produced it.

Some flowers, including many orchids, are “resupinate.” While the flower is developing, the flower stalk does a 180 degree twist, bringing what would be the bottom of the flower to the top. With lady’s slippers, the labellum, or lip, is inverted, so that it ends up not above the other two petals, but below them. This modified petal, or pouch, serves to attract pollinating insects and acts as a landing platform for them. For some unknown reason, the stalks of the pictured Pink Lady’s Slippers never twisted, allowing us to see the original position of the labellum in both flowers. (Photo by Sue Wetmore)

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