350 American Midland Naturalist Monograph No. 7 



31. Blades 5-10 nun wide. 6-10 cm long; 



ligiile 4-5 mm long; dry sandy soil. 

 June-July. [P. cuchlamydeum Shin- 

 ners] P. psvudopubcsccns Nash 



30. Spikelets 1.3-1.9 mm long; ligule 3-5 mm 

 long. 



32. Upper surface of blades glabrous or with 



a few long hairs toward the base, the 

 lower surface glabrous or pubeiailent; 



moist ground, local. June-July .-. 



P. tennesseense Ashe 



32. Upper surface of blades not glabrous. 



33. Upper surface of blades pilose, the 



hairs 3-5 mm long. 



34. Stems conspicuously villous with 



horizontal hairs 4-5 mm long; 



dry soil ; chiefly in the n. half of 



the state. June-July 



P. praecocius Hitchc. & Chase 



34. Stems with shorter hairs. 



35. Axis of panicle pilose; the low- 

 est panicle branches often 

 tangled or implicate; wet 

 meadows, swamps, or woods, 



local. June-July 



P. impUcatum Scribn. 



35. Axis of panicle puberulent; 

 branches ascending, not tan- 

 gled; sandy soil in n. part of 



111. June-July 



P. mcridionalc Ashe 



33. Upper surface of blades with some- 

 what appressed hairs 1-2 mm long; 

 meadows and open woods, common. 

 May-Sept P. huachucae Ashe 



29. Sheaths with appressed or ascending hairs; ligule 

 1-1.5 mm long; blades glabrous or nearly so 

 on the upper surface, puberulent beneath; 

 spikelets 1.8-2 mm long; sandy or gravelly soil 



in the n. part of 111. June-July — 



P. tsugetorum Nash 



70. Eriochloa HBK. — Cup Grass 



1. Pedicels and rachis copiously villous; spikelets about 5 mm long; 

 fields and waste places, occasional ; native of e. Asia. Liv- 

 ingston Co., Winterringer & Hoegger; Peoria, V. H. Chase 

 16782 ^.-E. villosa (Thunb.) Kunth 



