Cypripedium arietinum R. Br. in W.T. Aiton 1813 SECTION Arietinum

Side View of Flower

Inflorescence Photos by Dave Janas


Common Name Ram's Head Lady's Slipper

Flower Size 1" to slightly more [2.5 cm and more]

This medium sized, cold growing terrestrial species is found in eastern and central Canada and south to Minnesota and Connecticut where it is found in sphagnum bogs on wooded limestone slopes with elliptic-lanceolate, plicate leaves which spiral around the stem that blooms in the late spring and early summer on a short, slender stalked, pubescent, to 14" [35 cm] long, terminal raceme arising from a broad leaflike bract with a solitary, fragrant, nodding, short-lived flower arising from the larger semi-mature leaves of which there are 3 to 5.

Synonyms Arietinum americanum L.C. Beck 1833; Criosanthes arietina (R. Br. in W.T. Aiton) House ?; Criosanthes borealis Raf. 1818; Cypripedium arietinum f. albiflorum House 1923; Cypripedium arietinum f. biflorum P.M.Br. 1995

References W3 Tropicos, Kew Monocot list , IPNI ; Atlas des Orchidees Cultivees Constantin 1920 drawings fide; AOS Bulletin Vol 32 No 6 1963; AOS Bulletin Vol 33 No 5 1964 photo; Encyclopedia of Cultivated Orchids Hawkes 1965; Die Orchideen 3 Auflage Bd 1 Sonderabdruck aus Schlechter Lieferung 4 193 to 256 Brieger, Maatsch and Senghas 1971 photo ok; Orchid Digest Vol 46 No 6 1982 photo fide; AOS Bulletin Vol 55 No 7 1986 photo; Schlechteriana Vol 4 No 4 1993; AOS Bulletin Vol 66 No 3 1997 photo; Rudolf Schlechter Die Orchideen Band 1C lieferung 40 pg 2492 - 2564 Brieger 2000; AOS Bulletin Vol 73 No 5 2004 photo; Die Orchideen Schlechter 1915;