Cypripedium passerinum Richardson 1823 SECTION Cypripedium SUBSECTION Obtusipetala

Photo courtesy of David Mcadoo

Full shadeCold LATESpring To Summer

Common Name The Sparrow's Egg Lady's Slipper

Flower Size 1.2" [3 cm]

Found in the province of Alberta and the state of Montana in moist and dry coniferous forests, wooded ravines, and littorals of streams and lakeshores as a medium sized, cold growing, pubescent terrestrial species with ovate-lanceolate, plicate, glandular-pubescent leaves sheathing the stem and blooms in the late spring and summer on an erect, slender, to 14" [35 cm] long, usually single flowered inflorescence with a foliaceous, ovate-lanceolate floral bract.

SynonymsCypripedium passerinum f. minganense (Vict.) P.M.Br. 200; Cypripedium passerinum var. minganense Vict. 1929

References W3 Tropicos, Kew Monocot list , IPNI ; AOS Bulletin Vol 38 #10 1969 photo fide; The Native Orchids of the United States and Canada Luer 1975 drawing/photos fide; Orchid Digest Vol 47 No 1 1983 photo fide; Orchid Digest Vol 47 No 4 1983 photo; fide AOS Bulletin Vol 65 Vol 6 1996 photo fide; Rudolf Schlechter Die Orchideen Band 1C lieferung 40 pg 2492 - 2564 Brieger 2000 ; Orchid Digest Vol 70 #3 2006 photo fide; Orchid Digest Vol 71 No 3 2007 photo fide; AOS Bulletin Vol 79 #4 2010 photo fide; AOS Bulletin Vol 80 #4 2011 photo fide; AOS Bulletin Vol 83 #6 2014 photo fide; AOS Bulletin Vol 89 #1 2020 drawing/photo fide; AOS Bulletin Vol 89 #11 2020 photo fide;

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