Orchidaceae

Ram's head lady's slipper

Cypripedium arietinum R.Br.

Family: Orchidaceae
Genus: Cypripedium

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Ram's head lady's slipper (Cypripedium arietinum) — FlowerPhoto: Tom Scavo, CC BY 4.0, from iNaturalist

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Common names

By language (5)

arz: سيبريديوم اريتينوم
English: Ram's head lady's slipper, Rams-head lady's-slipper
French: Cypripède tête-de-bélier
German: Widder-Frauenschuh
Russian: Башмачок бараноголовый, Башмачок раноголовый

Synonyms

Arietinum americanum L.C.Beck
Criosanthes arietina (R.Br.) House
Criosanthes borealis Raf.
Cypripedium arietinum f. albiflorum House
Cypripedium arietinum f. arietinum
Cypripedium arietinum f. biflorum P.M.Br.

Flowers

In flower: May to June (from 296 flowering iNaturalist observations worldwide)

Characteristics

Growth habit: Forb/herb
Lifespan: Perennial
In the US and Canada: Canada: native, Lower 48 states: native

Photos

FlowerPhoto: Tom Scavo, CC BY 4.0, from iNaturalist
FlowerPhoto: christine123, CC BY 4.0, from iNaturalist
FlowerPhoto: Bruce Cook, CC0, from iNaturalist
FlowerPhoto: Dustin Snider, CC BY 4.0, from iNaturalist
Photo: Pverdonk, CC BY-SA 3.0, from Wikimedia Commons
Photo: agbelliveau, CC0, from iNaturalist
Photo: Brandon Corder, CC BY 4.0, from iNaturalist
Photo: christine123, CC BY 4.0, from iNaturalist
Photo: Dustin Snider, CC BY 4.0, from iNaturalist
Photo: psweet, CC BY-SA 4.0, from iNaturalist
Photo: victoriaelizabe, CC BY 4.0, from iNaturalist
Photo: agbelliveau, CC0, from iNaturalist

More in Cypripedium

Sources: classification, synonyms from World Flora Online Plant List (2026-06, CC0 1.0); common names, popularity from Wikidata (2026-10-26, CC0 1.0); common names, US characteristics from USDA PLANTS Database (2025-05-29, CC0 1.0). About our plant data.