730 



Misc. PUBLICATION 2UU, U. S. DEPT. OF AGRICULTURE 



5 to 10 mm. long, the inner plumose. % 

 — Occasionally cultivated in the Southern 

 States; adventive in wool waste, Yonkers, 

 N. Y. In the West Indies said to be good for- 

 age. India, 



Pexnisettjm alopecuroides (L.) Spreng. 

 Perennial; culms compressed, to 1 m. tall, 

 with elongate scabrous blades and softly 

 bristly panicles 8 to 15 cm. long; bristles of 

 the fascicles to 2 cm. long. % — Sparingly 

 cultivated; escaped in Berks Count}*, Pa.; 

 Asia. 



Pekntsettjm macrostachytjm (Brongn.) 

 Trin. Resembling P. setaceum, blades as 

 much as 2.5 cm. wide; panicle denser, brown- 

 ish purple, fascicles smaller; bristles not plu- 

 mose. 21 — Sparingly cultivated for orna- 

 ment. East Indies. 



Pennisetum latifolium Spreng. Peren- 

 nial; culms 100 to 150 cm. tall, the nodes 

 appressed-pubescent; blades 2 to 3 cm. wide, 

 tapering to a long point; panicles terminal 

 and axillary, nodding, 5 to 8 cm. long, the 

 bristles prominent. % — Occasionally cul- 

 tivated for ornament. South America. 



FIGURE 1113. — Pennisetum setaceum, X H. (Hitch- 

 cock, D. C.) 



Pennisetum ciliare (L.) Link. Culms 

 geniculate, from a knotted crown, 10 to 50 

 cm. tall; panicle 2 to 10 cm. long; bristles 

 united at the very base, flexuous, purple, 



Figure 1114. — Pennisetum clandestinum, X 1. (Chase 10181, Brazil.) 



145. CfiNCHRUS L. Sandbur 



Spikelets solitary or few together, surrounded and enclosed by a spiny 

 bur composed of numerous coalescing bristles (sterile branchlets), the bur 

 subglobular, the peduncle short and thick, articulate at base, falling with the 

 spikelets and permanently enclosing them, the seed germinating within the 

 old involucre, the spines usually retrorsely barbed. Annuals or sometimes 

 perennials, commonly low and branching, with flat blades and racemes of 



