MICHIGAN ACADEMY OF SCIENCE. 



241 



ORCHIDACEAE (Orchid Family.)* 



A. Lip a large oval inflated sac ; perfect anthers 2. 



Stem leafy; lip not fissured; flower yellow, or white 



variegated with crimson 1. 



Leaves only 2, basal; flowers pink 2. 



A. Lip not an inflated sac; perfect anther 1. 



Plants saprophytic, without green herbage; stems yel- 

 lowish or purplish 24. 



Plants normally with gi'een herbage. 



B. Flowers with a conspicuous spur at least 2 mm. 

 long. 



Lip fringed, divided, or 3-parted; tall leafy- 

 stemmed plants of moist situations 11. 



Lip not fringed, divided, or 3-parted. 



C. Flowers purplish or rose color; leaves 

 basal; lip whitish 

 Leaf solitary; flowers (1-1 J^ cm. long) 



in a tall raceme, rose colored 3. 



Leaves 2, obovate; flowers (2-3 cm. 



long) purplish, in a raceme 4. 



C. Flowers mostly greenish or greenish white. 

 D. Leaves radical, 1 or 2. 



Basa leaf 1; ovary strongly 

 ciirved; spur about equal to 



the lip 10. 



Basal leaves 2; ovary straight; 

 spur 2 or 3 times longer than 



the lip 9. 



D. Leaves cauline. 



Spur long-clavate, strongly 

 curved; stem with 1 basal 

 leaf 7. 



Spur not long-clavate, not 

 strongly curved ; stems leafy, 

 tall. 



Lip 3-toothed at the apex; 

 floral bracts long and con- 

 spicuous 6. 



Cypripedium. 

 Fissipes acaulis. 



Corallorrhiza. 



Blepharigloths. 



Orchis rotundifolia. 



Galeorchis spec- 

 tabilis 



Lysiella ohtusata. 



Lysias. 



Gymnadeniopsis 

 clavellata. 



Coeloglossum brac- 

 leatum. 



•This key, adapted to suit Michigan conditions, ia 1 ased in part on that of the Illust-ated Flcra by Bri toi and Frown, 

 ani in part on Gray's Manual, 7th eilition. The writer is respo jsibie for the Reneral arrangement, which is believed wil 

 simplify for beginners the identification of our orchid flora. 



