28 



A. provincialis, var. geminatus, Hack. Texas. 



14. A. saecharoides, Sws. (A. argenteus, D. C.) Texas to Arizona. 



15. A. scoparins, Jlichx. Rocky Mountains to the Atlantic. 



A. scoparius, var. inaritimns, Hack. (A. maritimus, Chap.) 



Florida. 

 A. scoparius, var. simplex, Hack. Texas to Arizona. 

 A. scoparius, var. multiramea, Hack. Common. 



16. A. tener, Kth. Florida to Texas. 



17. A. Wrightii, Hack. New Mexico to Arizona. 



A . scopariiis forms an important portion of the native grasses of 

 the prairies in Kansas and Nebraska, extending in some of its forms 

 to the Atlantic coast. 



A. macrourus, or Heavy-topped Broom-grass, is frequent on low, 

 sandy ground near the coast from New Jersey to Florida, and thence 

 westward to Arizona. 



A. provincialis, or Finger-spiked Broom-grass, frequently also 

 called Blue-stem in the West, is the tallest of our species. It grows 

 to the height of 5 or 6 feet, in rocky or hilly ground, or at the West 

 on the virgin prairies and plains, where it is one of the principal 

 hay grasses, being extensively cut for winter-feeding. 



Cheysopogon, Trin. 



Flowers loosely paniculate. Fertile spikelets one-flowered, sessile 

 between two pedicellate male or barren spikelets at the end of the 

 slender branches of the panicle, with, sometimes, one to three pairs 

 of spikelets on the branch below the terminal three. Fertile spike- 

 lets with the lower glume larger and coriaceous ; the second nar- 

 rower, thick, keeled, pointed, or awned; the third hyaline and 

 empty; the fourth or flowering glume hyaline aud awned. Palet 

 minute or none. 



1. C. avenaceum, Beath. (Sorghum aveuaceum, Chap.) North 



Carolina to Texas. 



2. C. nutans, Benth. (Sorghum nutans, Gr.) New England to 



Rocky Mountains. 

 This is a tall, perennial grass, having a wide range over all the 

 country east of the Rocky Mountains. It grows rather sparsely, 

 aud forms a thin bed of grass. The stalks are 3 to 4 feet high, 

 smooth, hollow, straight, and having at the top a narrow panicle of 

 handsome straw-colored or brownish flowers, 6 to 12 inches long, 



