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Cypripedium parviflorum var. parviflorum

Cypripedium parviflorum Salisb. var. parviflorum

Cypripedium calceolus L. ssp. parviflorum (Salisb.) Hultén

Cypripedium calceolus L. var. parviflorum (Salisb.) Fernald

Small Yellow Lady’s Slipper

KingdomPlantaePlants, but not fungi, lichens, or algae (from Stearn’s Botanical Latin)
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”—a smaller small flower
var.parviflorumLatin for “small flower”—a smaller small flower

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 6-16" (15-40 cm) high, smaller in exposed or cold conditions, or in calcium-bearing soil. Leaves are egg-shaped, folded lengthwise, 2-6" (6-15 cm) long and 1-3" (3-8 cm) wide. The yellow, slipper-like flower is called the lip, and is 1-2½" (3-7 cm) long and ⅛-1" (6-30 mm). Petals are dark reddish brown. Although they are densely spotted, the spots are so small that the effect is uniformly dark, vs. blotchy as with other varieties. The flowers may have a rose-like fragrance. Produces one or two flowers per stem.

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 (Small Yellow Lady’s Slipper)

5/15/2010 · Garden in the Woods, Framingham, MA
≈ 9 × 11" (23 × 26 cm)

Cypripedium parviflorum (Small Yellow Lady’s Slipper)

5/22/2010 · Garden in the Woods, Framingham, MA
≈ 7 × 4½" (17 × 11 cm)

 
Cypripedium parviflorum
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Cypripedium parviflorum var. parviflorum

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. parviflorum at the Orchids of Wisconsin

Cypripedium parviflorum var. parviflorum on www.orchidspecies.com

Cypripedium parviflorum var. parviflorum on ohiodnr.com

Cypripedium parviflorum var. parviflorum on eFloras

Cypripedium parviflorum (Small Yellow Lady’s Slipper)

5/15/2010 · Garden in the Woods, Framingham, MA
≈ 6 × 8" (15 × 21 cm)

Cypripedium parviflorum var. parviflorum description by Thomas H. Kent, last updated 16 Aug 2013.

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Range:

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