28 POACEAE. 



2. Chaetochloa setosa (6w.) Soribn. Bull. U. S. Dep. Agr. Agrost. 4: 39. 



1897. 



Fanicum setosum Sw. Prodr. 22. 1788. 



Setaria setosa Beauv. Agrost. 51, 178. 1812. 



Panicum paraotaenoides Trin. Mem. Acad. St. Petersb. VI. 3': 219. 1834. 



Perennial, tufted; culms wiry, slender, 3-9 dm. high, somewhat flalttened. 

 Leaves 2 dm. long or less, pubescent or scabrous, 5-15 mm. wide; inflorescence 

 more or less branched, the branches erect, or ascending, the lower sometimes 

 3 cm. long; bristles 1-3 at the base of all the spikelets or of some of them, 

 6-12 mm. long; spikelets ovoid, about 2 mm. long. 



Sandy or rocky soil, Berry Islands, Water Cay, Acklin's Island, Bleuthera, 

 Crooked Island, Inagua, Little Inagua and Anguilla Isles : — Western Texas and New 

 Mexico; tropical America. Referred by Hitchcock to Setaria caudatai (Lam.) E. & 

 S., and by Coker to Setaria macrostachya H.B.K. Bristly Pox-tail Gkass. 



3. Chaetocliloa macrosperma Scribn. & Merr. Bull. U. S. Dep. Agr. Agrost. 



21:33. 1900. 



Perennial; culms rather stout, glabrous, up to 1.2 m. high. Leaf -sheaths 

 compressed, the margins ciliate, the blades 1-3 dm. long, 1-2 cm. wide, glabrous; 

 spike-like panicle 2.5 dm. long or less, 2-4 em. thick; bristles 1.5-3 cm. long; 

 spikelets acute, 3 mm. long, the narrowly ovoid flowering scale transversely 

 wrinkled, acute. 



Coastal thicket, Frozen Cay, Berry Islands : — southern Florida and Texas. 

 Labge Fox-tail Grass. 



[Setaria filiformis of Coker is a misprint for Scleria filiformis.} 



16. CENCHB.OPSIS Nash, in Small, ¥\. SE. U. S. 109. 1903. 



Perrenial grasses, with long rootstocks and fiat leaves, the spikelets in 

 terminal spikes, each spikelet subtended by an involucre of 1 or 2 outer rows 

 of barbed, thick-based bristles, and 1 or 2 inner rows of barbed spines longer 

 than the bristles, the involucre jointed to the raohis and deciduous. Spikelets 

 of 4 scales, the first and second ones empty, the third enclosing a palet one- 

 half its length or less, the fourth enfolding a similar palet and a perfect 

 flower. Stamens 3. [Greek, resembling Cenchrus.] A few species, of tropical 

 America. Type species: Cenchrus myosuroides H.B.K. 



1. Cenchropsis myosuroides (H.B.K.) Nash, in Small, PI. SE. XJ. S. 109. 1903. 



Cenchrus myosuroides H.B.K. Nov. Gen. 1: 115. 1815. 



Culms erect, slender, 0.6-1.5 m. tall, simple or branched above, glabrous. 

 Leaves 1-3 dm. long, 3-8 mm. wide, glabrous; spikes 5-20 cm. long; involucres 

 numerous, the barbed spines about 5 mm. long, and about as long as the spike- 

 let. 



In sandy places, Grand Turk, Inagua, and Anguilla Isles : — southern Florida ; 

 Mexico ; Cuba ; Hispanlola ; Porto Eico ; tropical South America. Spiked Fox-tail 

 Grass. 



17. CENCHRUS L. Sp. PI. 1049. 1753. 



Annual or perennial grasses, with usually flat leaves. Inflorescence spike- 

 like. Spikelets subtended by a spiny involucre which is deciduous with them 

 at maturity. Scales 4; the first hyaline; the second and third membranous, the 

 latter sometimes having a palet and staminate flower in its axil; the fourth 

 chartaeeous, subtending a palet of similar structure which encloses a perfect 



