100 American Midland Naturalist Monograph No. 2 



rare. June-July. White Fringed Orchid 



H. leucophaea (Nutt.) Gray 



9. Flowers lilac or purplish, crowded in the spilce; meadows and 

 swamps, Lake and Cook counties, rare. July-Aug. Small Purple 



Fringed Orchid H. psycodes (L.) Spreng. 



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



rare, s. 111. July-Aug. Fringeless Purple Orchid 



H. peramoena Gray 



4. Calopogon R. Br. 



(Limodonim L. ex p.) 



C. pulchellus (Salisb.) R. Br. Grass-pink Orchid. Meadows, in the n. half 

 of 111. June-July. 



5. Triphora Nutt. 



T. trianthophora (Sw.) Rydb. Nodding Pogonia. Woods, not common. 

 Aug. -Sept. [^Pogonia trianthophora (Sw.) BSP.] 



6. Pogonia Juss. 



P. ophioglossoides (L.) Ker. Swamps and meadows, n.e. III., not common. 

 June-July. 



7. Spiranthes Rich. — Ladies' Tresses 



L Spike 8-12 mm. thick; flowers 4-5 mm. long, in a single spiral; rachis and 

 upper part of stem glabrous; leaves oval, basal, soon withering, and usually 



absent at flowering time; open woods. July-Sept 



S. gracilis (Bigel.) Beck 



1. Spike 1.5-2.5 cm. thick; flowers 7-10 mm. long, in 2 or 3 spirals; rachis and 

 upper part of stem pubescent; leaves linear; meadows and swamps. Aug.- 

 Oct S. cernua (L.) Rich. 



8. GOODYERA R. Br. 



{Peranuum Salisb.) 



G. piibescens (Willd.) R. Br. Rattlesnake-plantain. Woods, rare. July- 

 Aug. [Epipactis pubcscens (Willd.) A. A. Eaton.] 



9. Malaxis Sw. 



M. untjolia Michx. Adder's-mouth Orchid. Woods, very rare. Athens, 

 Menard Co., E. Hall in 1861. 



10. LiPARis Rich. — Twayblade 

 {Lepiorchis Thouars.) 



1. Flowers few, greenish; lip about 5 mm. long, shorter than the petals; w\et 

 ground in the n. half of the state, rare. June-July L. loesclii (L.) Rich. 



1. Flowers numerous, purple; lip 10-12 mm. long, about equalling the petals; 

 woods, not common. June-July L. liliifolia (L.) Rich. 



