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McAdoo, David R.
Cypripedium parviflorum Salisb.
Lesser yellow lady's slipper, Yellow lady's-slipper orchid
USDA Symbol: CYPA19
This orchid is easily distinguished from others by its large yellow lip, or slipper. It grows up to 2 feet tall and has large, strongly veined leaves 6–8 inches long and half as wide. It has a flower, sometimes 2, at the end of the stem, cream-colored to golden-yellow. Flowers have 3 sepals, greenish-yellow to brownish-purple, the upper sepal larger, usually erect, and hanging over the blossom. The upper sepal is 1 1/4–3 1/2 inches long, the lower 2 sepals are united and appear as 1 beneath the lip. There are 3 petals. The 2 lateral petals are long and narrow, purplish-brown to greenish-yellow, and spirally twisted–the shoestrings to the slipper. The lip, or slipper, is creamy or yellow, and about 2 1/2 inches long, and cupped to form the slipper shape. The stamens and pistil hang down toward the opening of the slipper.
Bloom InformationBloom Color: Yellow , Green , Brown
Bloom Time: Apr , May , Jun , Jul , Aug
, WY Canada: NB
Growing ConditionsLight Requirement: Part Shade
Soil Moisture: Moist , Wet
BenefitUse Medicinal: First Nations made a preparation from the roots that was drunk as a treatment for worms(Niering).
Warning: POISONOUS PARTS: Glandular, irritating hairs on leaves. Symptoms include skin irritation after contact.
Conspicuous Flowers: yes
National Wetland Indicator Status
This information is derived from the U.S. Army Corps of Engineers National Wetland Plant List, Version 3.1
(Lichvar, R.W. 2013. The National Wetland Plant List: 2013 wetland ratings. Phytoneuron 2013-49: 1-241). Click here
for map of regions.
From the National Organizations Directory
According to the species list provided by Affiliate Organizations, this plant is either on display or available from the following:
Mt. Cuba Center
- Hockessin, DE
Record Last Modified: 2007-08-09
Research By: TWC Staff