60 PANICACE.E. 



Dry soil, New England to the Rocky Monntains, south to the 

 Argentine Republic. 



This grass starts late in spring and is late in flowering. In 

 some of the prairie regions it forms an important element in the 

 grazing. With other wild grasses it is often cut for hay, though at 

 the east it is considered of poor quality. 



Var. stipoides (Kunth) Hack. Monog. Phan. 6 : 530 (1889). 

 A. stipoides H. B. K. Nov. Gen. et sp. 1 : 189 (1815). 



Spikelets 4-6 mm. long, awn 10-15 mm. long; ligule 2-3 mm. 

 long; blades fiat or subconvolute above, scabrous or pubescent. 

 Nodes of the peduncle with short, silvery, silky hairs. Spikelets 

 chestnut-colored, first glume pilose for two-thirds its length, second 

 glabrous. 



Var. Linngeanus Hack. D. C. Monog. Phan. 6 : 531 (1889). A. 

 nutans L. in part. Sorghum nutans Chapm. Fl. S. States 583 

 (1860). Spikelets linear, oblong, 6-7 mm. long, awn 20-30 mm. 

 long; ligule 2 mm. long; blades very scabrous. Panicle 25-30 cm. 

 long. Tenn., Scrihner. 



Florida, Texas, Maine. 



Var. incompletus (Presl.) Hack. 1. c. A. incompletus Presl. 

 Eeliq. Ha?nk. 1 : 342 (1830). 



Spikelets linear, oblong, 4 mm. long, brownish, the awn 20-22 

 mm. long. Sheaths glabrous; ligule 1-2 mm. long; blade 4-5 

 mm. wide, fiat, glabrous or scabrous. Panicle 10-15 cm. long, 

 rather dense, rachis smooth. First glume truncate, pilose for two- 

 thirds of its length, second glabrous. 



Mexico, Pringle 2466, Palmer 590. 



28. A. unilateralis Hack. D. C. Monog. Phan. 6 : 533 (1889). 

 A. secundus Ell. Bot. S. C. and Ga. 1 : 38 (1816). Sorghum 

 secundum. Chapm. Fl. S. States, 583 (1860). 



Perennial; culms 60-100 cm. or more high. Sheaths glabrous, 

 nodes puberulent or smooth; ligule 4-5 mm. long; blades narrowed 

 at the base, fiat or subconvolute, 2-5 mm. wide. Panicle 18-25 

 cm. long, linear, secund, dense or open, rays capillary, often curved. 

 Spikelets linear-lanceolate or linear-oblong, 7 mm. long, brown, first 

 glume firm, truncate, 9-nerved, callus densely barbed; second 



