152 Karl M. Wiegand and Arthur J. Eames 



e. Sepals and petals, except the lip, erect and connivent ; flowers small, 

 numerous, white or greenish white, in spiral or secund spikes. 

 /. Lip saccate ; leaves ovate or elliptical, mostly variegated, basal. 



11. Epipactis 

 /. Lip not saccate ; leaves ovate or linear, never variegated, basal or cauline. 



10. Spiranthes 

 c. Sepals and petals free, usually divaricate; flowers greenish or purplish. 

 /. Sepals 8-10 mm. long; flowers many, in a long raceme; leaves many- 

 nerved, plaited, papery; plant 25-60 cm. high. 9. Serapias 

 /. Sepals less than 6 mm. long; leaves inconspicuously veined, waxy; plant 

 3-25 cm. high. 

 g. Leaf solitary. 14. Microstylis 

 g. Leaves 2, appearing opposite, cauline. 12. Listera 

 g. Leaves 2, basal. 15. Liparis 

 d. Green foliage absent at flowering time (the remains of a single broad, 

 many-veined, plaited, papery, basal leaf may be present in the first-named 

 genus) ; stem and flowers brownish. 

 e. Sepals 12 mm. long; plant from a globular corm. 16. Aplectrum 

 e. Sepals 6 mm. long or less ; plant from coral-like rootstocks. 



13. Corallorrhiza 



1. Cypripedium L. 



a. Plant leafy-stemmed ; flowers 1-2, rarely several ; lip not fissured in front. 



b. Lip yellow, shorter than the brownish, linear-lanceolate, acute sepals and petals. 

 c. Lip 2-3 cm. long; sepals deep purple-brown. 1. C. parviflorum 



c. Lip 3.5-5 cm. long ; sepals paler, shorter. la. C. p., var. pubescens 



b. Lip white flushed with purple; sepals and petals greenish white, broad, obtuse. 



2. C. reginae 



a. Plant acaulescent, 1-flowered, 2-leaved at the base; lip pink, fissured in front. 



3. C. acaule 



1. C. parviflorum Salisb. Smaller Yellow Lady's Slipper. 



Boggy and springy places, in marly, rarely subacid soils ; infrequent. May 25- 

 June 15. 



Headwaters Swamp; Michigan Hollow Swamp (£>.!); Six Mile Creek (D. !) ; 

 Cascadilla woods (£>.) ; near Freeville (D.) ; Mud Creek, Freeville; Malloryville 

 (£>.!) ; larch and arbor vitae swamp, Savannah; boggy woods s. w. of Westbury. 



Newf. to B. C. and Wash., southw. to Ga., Mo., and Nebr. ; rare or absent on the 

 Atlantic Coastal Plain. 



la. C. parviflorum Salisb., var. pubescens (Willd.) Knight. (C pubescens of 

 Cayuga Fl.) Larger Yellow Lady's Slipper. 



In situations similar to the preceding, but often drier ; frequent. May 25-June. 



Headwaters Swamp ; Enfield Glen ; Coy Glen ; Six Mile Creek ; University Grove, 

 formerly (Dr. Jordan) ; Cascadilla woods (D.) ; Ellis Hollow Swamp; swamp e. of 

 Slaterville; Fir Free Swamp between Slaterville and Dryden; Mud Creek, Free- 

 ville; "abundant in the swamps of Freeville, Beaver Cr. and elsewhere" (D.), 

 however, apparently not so abundant as implied in the foregoing statement; often in 

 rich, rather dry woods, as at Enfield Glen, upper Six Mile Creek, and the Caroline 

 hills. 



N. S. to Minn., southw. to Ga. and Nebr. ; rare near the coast. 



Perhaps only an extreme of the preceding species, and doubtfully worthy of 

 nomenclatorial distinction. Knight (Rhodora 8:93. 1906) claims to have seen one 

 form change into the other when transplanted to garden soil. 



