28 POACEAE. 



2. Chaetochloa setosa (Sw.) Scribn. Bull. U. S. Dep. Agr. Agrost. 4:39. 



1897. 

 Panicum setosum Sw. Prodr. 22. 1788. 

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

 Panicum paractaenoides Trin. Mem. Acad. St. Petersb. YI. 3-: 219. 1834. 



Perennial, tufted; culms why, slender, 3-9 dm. high, somewhat flattened. 

 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. 



Sandv or rockv soil, Berry Islands, Water Cay. Acklin's Island, Eleuthera, 

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

 Mexico ; tropical America. Referred by Hitchcock to Setaria caiidata (Lam.) R. & 

 S., and by Coker to Setaria macrostachija H.B.K. Bristly Fox-tail Geass. 



3. Chaetochloa 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 cm. thick; bristles 1.5-3 cm. long; 

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

 wrinkled, acute. 



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

 Laege Fox-tail Gbass. 



[Setaria filiformis of Coker is a misprint for Scleria filiformis.'] 



16. CENCHROPSIS Xash, in Small, PL SE. U. S. 109. 1903. 



Perrenial grasses, with long rootstocks and flat 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 rachis 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 Cenclirus.] A few species, of tropical 

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



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

 Cenclirus myosuroides H.B.K. Xov. 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 ; Hispaniola ; Porto Rico ; 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 

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



