700 MISC. PUBLTCATIOX 200, U. S. DEPT. OF AGRICULTURE 



knotted crown, erect, 40 to 90 

 tall; lower sheaths pubescent to T Cn *j' 

 the summit, with spreading r^? r 

 blades 4 to 15 cm. long, 2 to nairs ' 

 wide, erect, firm, subinvolute, T ? m ' 

 on upper surface toward bas o . pi0Se 

 icles 3 to 8 cm. , V p , an ~ 



terminal and long ' Ver ^ slend er, 



ng, pointed, glabrous, 

 the pedicel usually with a few long 

 hairs. % —Margins of swamps 

 and w T et places in pine barrens near 

 the coast, North Carolina to Florida 

 and Texas; West Indies. 



11. Agrostoidea— Tufted perennials; 

 culms erect, compressed; sheaths 

 keeled; ligules membranaceous, 

 mostly about 1 mm. long; spike- 

 lets short-pediceled, lanceolate, 

 pointed, 5- to 7-nerved, gla- 

 brous; glumes and sterile lemma 

 mostly keeled; fruit smooth and 

 shining, with a minute tuft of 

 thickish hairs at apex. 

 156. Panicum abscissum Swallen. 

 (Fig. 1065.) Culms 50 to 70 cm. tall, 

 densely tufted, compressed; lower 



Figure 1063. — Panicum amarulum. Two views of 

 spikelet, and floret, X 10. (Type.) 



tall, glaucous; rhizomes vertical or 

 ascending; blades 20 to 50 cm. long, 

 5 to 12 mm. wide, more or less in- 

 volute, pilose on the upper surface 

 near the base; panicle large, rather 

 compact, 5 to 10 cm. wide, slightly 

 nodding, densely flowered; spikelets 

 4.3 to 5.5 mm. long, acuminate. % 

 — Sandy shores and coast dunes, New 

 Jersey to Virginia; Florida; Louis- 

 iana and Texas; introduced in West 

 Virginia; Yucatan; Bahamas; Cuba. 



10. Tenera. — Perennials; culms sub- 

 compressed, wiry; ligules minute; 

 spikelets short-pediceled ; fruit 

 smooth and shining. 

 155. Panicum tenerum Beyr. (Fig. 



1064.) Culms in small tufts from a 



Figure 1064. — Panicum tenerum. Two views of spike- 

 let, and floret, X 10. (Type.) 



Figure 1065. — Panicum abscissum. Spikelet and sum- 

 mit of sheath, X 10. (Type.) 



sheaths broad, strongly keeled, 

 crowded, 3 to 4 mm. wide from keel 

 to margin, truncate or extended at 

 the summit into short, broad, obtuse 

 auricles; blades 15 to 25 cm. long, 1 

 to 2 mm. wide, folded, glabrous or 

 scabrous; panicles terminal and axil- 



