158 PANICACE^. 



Culms slender, erect, flatteued and branching below, 60-90 cm. 

 high, from creeping rootstocks; nodes glabrous. Leaf -blades 

 scabrous, twisted, flat, some of the largest 20 cm. long, 4 mm. wide, 

 having a very long slender apex. Panicle cylindrical, pale green, 

 interrupted, 15-20 cm. long, 7 mm. diam., main axis pilose, bris- 

 tles 1-3 to the spikelet, the asperities pointing upwards, some of 

 them as long as the spikelets, others 10 mm. long, with all grades 

 between. Spikelets oblong, moderately acute, nearly 3 mm. long, 

 first glume broad, nearly half the length of the spikelet, 3-nerved, 

 second glume and floral glume of the neuter spikelet equal, 5-7- 

 nerved; palea small; fertile floret acute, finely transversely 

 wrinkled. A good forage grass. 



Arizona, Pringle; Lower California and Mexico, Palmer 340. 



New Mexico, Texas, and Arizona; also West Indies, Brazil, and 

 East Indies. 



Var. pauciflora Vasey, ined. 



Much more slender, 30-40 cm. high, blades thinner, nearly 

 smooth, 10 cm. long, 8-10 mm. wide; panicle more interrupted, 

 some of the lower branches 1 cm. long. 



California, Palmer 191. 



14. C. uniseta (Presl) Kuntze, Eev. Gen. PL 770 (1891). Uro- 

 chloa uniseta Presl, Reliq. Ha^nk. 1: 319 (1830). Panicum unise- 

 twn Trin. et Rupr. Mem. Acad. St. Petersb. (VI.) t. 3:217 

 (1835). Setaria uniseta Fourn. Ilemsl. Biol. Centr. Am. Bot. 

 3:506 (1880). 



Culms slender, smooth or rough, branching below, 40-70 cm. 

 high. Leaf-blades flat, twisted (?), scabrous, 10-14 cm. long, 10-15 

 mm. wide. Spikes interrupted, the larger branches 3-5 mm. long, 

 bristles single, finely serrulate, 10-15 mm. long. Spikelets oval, 

 hardly acute, 2 mm. long, first glume less than half as long as the 

 spikelet, 3-nerved, second and the floral glume of the neuter spike- 

 let 5-nerved, the former a little the shorter; palea small; fertile 

 floret with very slight transverse ridges as seen with a lens. 



Mexico, Pringle 381. 



15. C. sulcata (Kaddi). Setaria sulcata Raddi, Agrost. Bras. 

 50. 



