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Cypripedium parviflorum var. pubescens

Cypripedium parviflorum Salisb. var. pubescens (Willd.) Knight

Cypripedium calceolus

Cypripedium calceolus L. var. planipetalum (Fernald) Victorin & Rouss.

Cypripedium calceolus L. var. pubescens (Willd.) Correll

Cypripedium furcatum Raf.

Cypripedium planipetalum (Fernald) Morris & Eames

Cypripedium pubescens Willd.

Cypripedium pubescens Willd. var. pubescens

Yellow Lady’s Slipper, Greater Yellow Lady's Slipper, Large Yellow Lady’s Slipper

KingdomPlantaePlants, but not fungi, lichens, or algae
SubkingdomTracheobiontaVascular plants—plants with a “circulatory system” for delivering water and nutrients
DivisionMagnoliophytaFlowering plants, also known as angiosperms
ClassLiliopsidaMonocots (plants with a single seed leaf); includes the lily family
SubclassLiliidaeIncludes lilies, orchids, and many others
OrderAsparagalesA diverse group that includes asparagus
FamilyOrchidaceaeOrchid family
GenusCypripediumLatinization (albeit an incorrect one) of ancient Greek words meaning “Venus’ shoe”
SpeciesparviflorumLatin for “small flower”
var.pubescensDowny with soft short hairs (from Stearn's Botanical Latin)

About plant names...

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.

 

Cypripedium parviflorum (Yellow Lady’s Slipper, Greater Yellow Lady's Slipper, Large Yellow Lady’s Slipper)

5/15/2010 · Garden in the Woods, Framingham, MA
≈ 21 × 14" (52 × 34 cm)

Cypripedium parviflorum (Yellow Lady’s Slipper, Greater Yellow Lady's Slipper, Large Yellow Lady’s Slipper)

6/15/1990

Cypripedium parviflorum (Yellow Lady’s Slipper, Greater Yellow Lady's Slipper, Large Yellow Lady’s Slipper)

6/15/1990

 
Cypripedium parviflorum

Cypripedium parviflorum var. parviflorum
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Cypripedium parviflorum var. pubescens
Common Name

Yellow Lady’s Slipper

Small Yellow Lady’s Slipper

Yellow Lady’s Slipper
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.
Range/ Zones

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 Aug 2013.

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Range:

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