296 American Midland Naturalist Monograph No. 7 



2. Stem scapiform; leaves basal, orbicular, 3-10 cm broad; lip 

 lanceolate, entire, about 1 cm long; flowers yellowish-green; 

 rich woods ; Cook and Lake counties. June-July. Round- 

 leaved Orchid H. hookeri Torr. 



1 . Lip fringed or deeply lobed ; flowers large and showy. 



6. Flowers orange-yellow; lip oval, about 1 cm long, the conspicu- 

 ous fringe 3-5 mm long; wet ground, rare, Cook Co. Yellow 



Fringed Orchid H. ciliaris (L.) R.Br. 



6. Flowers whitish, greenish, or piaplish ; lip more or less 3-lobed, 

 each lobe fringed or denticulate. 

 7. Petals entire; flowers greenish; lobes of the lip narrow, few- 

 fringed; swamps, rare; Cook, Kane, Kankakee, Lake, 

 Vermilion, and Winnebago counties. June-July. Green 



Fringed Orchid H. lacera (Michx. ) Lodd. 



7. Petals denticidate; lobes of the lip fan-shaped. 



8. Lip deeply fringed and 3-parted, the fringe 2-5 mm long. 



9. Flowers creamy-white, fragrant, the spikes relatively 



few-flowered; wet meadows, rare. June-July. White 



Fringed Orchid H. leucophaea (Nutt.) A.Gray 



9. Flowers lilac or purplish, crowded in the spike; mead- 

 ows and swamps, rare; Cook, Lake, and Winnebago 

 counties. July-Aug. Small Purple Fringed Orchid 



H. psycodes (L.) Spreng. 



8. Lip toothed but not fringed; flowers violet-purple; moist 

 woods, occasional; s. 111. July-Aug. Fringeless Purple 

 Orchid H. peramocna A.Gray 



4. Calopogon R.Br. — Grass-pink Orchid 



C. pulchellus (Salisb.) R.Br. Meadows, chiefly in the northern half 

 of 111. May-July. 



5. Triphora Nutt. — Nodding Pogonia 

 T. trianthopJiora (Sw.) Rydb. W'oods, not common. Aug. -Sept. 

 \Pogonia trianthophora (Sw. ) BSP.]. 



6. Pogonia Juss. 

 P. ophioglossoides (L.) Ker. Swamps and meadows, not common; 

 Cook, Lake, Lee, McHenry, and Will counties. June-July. 



7. Spiranthes Rich. — Ladies' Tresses 

 1. Raceme loosely-flowered, the flowers usually in a. single row, 

 spirally twisted or merely secund. 

 2. Rachis of inflorescence and stem glabrous; leaves basal, oval, 

 petioled, soon withering and usually absent at flowering time. 

 3. Perianth 3 mm long; lip entirely white; root solitary; dry 

 woods and bluff tops; Jackson, Pope, Randolph, and Union 

 counties. July-Sept. [S. tuherosa Raf., nom. dub.; S. beckii 

 sensu auth.] S. grayi Ames 



