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Cypripedium parviflorum Salisb. var. pubescens (Willd.) Knight Cypripedium calceolus Cypripedium calceolus L. var. planipetalum (Fernald) Vict. & J. Rousseau Cypripedium calceolus L. var. pubescens (Willd.) Correll Cypripedium furcatum Raf. Cypripedium planipetalum (Fernald) Morris & Eames Cypripedium pubescens Willd. Cypripedium pubescens Willd. var. pubescens Cypripedium calceolus L. var. planipetalum (Fernald) Victorin & Rouss. Yellow lady’s slipper, greater yellow lady’s slipper, large yellow lady’s slipper
Yellow lady’s slippers, members of the orchid family, are native to North America, and may be native to Eurasia as well. It is not clear whether the Eurasian varieties are separate species. Because these species are highly variable, botanists also have a difficult time distinguishing among several varieties of North American yellow lady’s slippers. Identification: Plants are 8-30" (20-76 cm) high, but much smaller in exposed or cold conditions, or in calcium-bearing soil. There are one or two flowers on each stem. The slipper-like flower is called the lip, and is yellow, often with purple veins or red dots, 1-2" (2.9-5.4 cm) long, larger than the other varieties of Cypripedium parviflorum. Three sepals extend from the base of the flower, usually twisted or wavy, greenish-yellow to purple-brown, each up to 3½" (8.9 cm) long. Leaves are 6-8" (15-20 cm) long and 2½-3½" (6.3-8.9 cm) wide, elliptical in shape, with roughly parallel veins. Here are some varieties of yellow lady’s slippers. Some botanists believe Cypripedium parviflorum var. parviflorum and C. parviflorum var. pubescens are the same species. |
5/15/2010 · Garden in the Woods, Framingham, MA
6/15/1990
6/15/1990 |
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Cypripedium parviflorum |
Cypripedium parviflorum var. parviflorum |
You are here Cypripedium parviflorum var. pubescens |
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| Plant | 6-16" (15-40 cm) high, but much smaller in exposed or cold conditions, or in calcium-bearing soil. | 6-16" (15-40 cm) high, smaller in exposed or cold conditions, or in calcium-bearing soil. | 8-30" (20-76 cm) high, but much smaller in exposed or cold conditions, or in calcium-bearing soil. | |||||||||||||||||||||||||||||
| Flowers | Yellow, ¾-1¾" (1.9-4.4 cm) long. The sepals and petals are greenish-yellow to purplish-brown, usually somewhat twisted or wavy, each up to 1¾" (4.4 cm) long. | Yellow, 1-2½" (3-7 cm) × ⅛-1" (6-30 mm). Petals are dark reddish brown. Although densely spotted, the spots are so small that the effect is uniformly dark, vs. blotchy as with other varieties. 1-2 flowers per stem. | Yellow, often with purple veins or red dots, 1-2" (2.9-5.4 cm) long. | |||||||||||||||||||||||||||||
| Leaves | Elliptical, with roughly parallel veins, 2½-7" (6.3-17 cm) and up to 2½" (7.0 cm) wide. | Elliptical, folded lengthwise, 2-6" (6-15 cm) long and 1-3" (3-8 cm) wide. | 6-8" (15-20 cm) long and 2½-3½" (6.3-8.9 cm) wide, elliptical in shape, with roughly parallel veins. | |||||||||||||||||||||||||||||
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| Type | Wild | Wild | Wild | |||||||||||||||||||||||||||||
Online References:
Cypripedium parviflorum var. pubescens on www.orchidworks.com
Cypripedium parviflorum var. pubescens on Vascular Plants of the Gila Wilderness
Cypripedium parviflorum var. pubescens at the University of Wisconsin's Robert W. Freckmann Herbarium
Cypripedium parviflorum var. pubescens at the Lady Bird Johnson Wildflower Center
Cypripedium parviflorum var. pubescens at Minnesota Wildflowers
Cypripedium parviflorum var. pubescens on eFloras
Cypripedium parviflorum var. pubescens description by Thomas H. Kent, last updated 16 Sep 2020.
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