Cypripedium arietinum R. Br. in W.T. Aiton 1813 SECTION Arietinum
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 species is found in eastern and central Canada and south to Minnesota and Connecticut where it grows as a cool to cold growing terrestrial found in sphagnum bogs on wooded limestone slopes with elliptic-lanceolate, plicate leaves that 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 ;
AOS Bulletin Vol 32 No 6 1963; AOS Bulletin Vol 33 No 5 1964 photo; Encyclopedia of Cultivated Orchids Hawkes 1965; Die Orchideen #4 13-16 tafel 5 Rudolph Schlechter 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; AOS Bulletin Vol 73 No 5 2004 photo;
--------------------------------------------------------------------------------------------------------------------------
-------------------------------------------------------------------------------------------------------
to 
LATE
EARLY 
