POACEAE 95 



45. Panicum pyriforme Nash. Stems densely tufted, 3-4 dm. tall, rather slender, 

 glabrous, rather weak, finally mucii branciied : leaves usually 2, or sometimes 3 ; sheaths 

 densely papillose-hirsute with long reHexed hairs ; blades thin, lax, glabrous on both sur- 

 faces, long-acuminate, narrowed to the barely rounded base, the primary ones 1-2 dm. 

 long, 8-12 mm. wide : panicle ample, loose and open, 6-1 1 cm. long, its branches widely 

 spreading: spikelets rather few, about 2.5 mm. long and 1.5 mm. wide, broadly obovoid, 

 densely pubescent with long hairs. 



In clay or sandy soil, peninsular Florida. Spring and summer. 



46. Panicum laxiflorum Lam. Stems tufted, erect, simple, 2-4 dm. tall, pubescent 

 or glabrous : leaf-sheaths hirsute with reflexed hairs ; blades 6-13 cm. long, 4-10 mm. 

 wide, erect, glabrous or pubescent, ciliate on the margin : panicle 5-10 cm. long, its axis 

 and erect or spreading branches sometimes hirsute : spikelets about 2 mm. long, elliptic or 

 narrowly obovoid, strongly pubescent. 



In moist or dry soil, Virginia to Kentucky and Florida. Summer. 



47. Panicum neuranthum <Triseb. A tufted usually glabrous perennial, or some- 

 times the sheaths and lower part of the stem ascending-hirsute. Stems erect, 3-6 dm. tall, 

 finally dichotoraously much-branched : primary leaves 4-6 ; sheaths usually much shorter 

 than the internodes ; blades erect, firm, thickish, the primary ones 3-10 cm. long, 2-5 mm. 

 wide, long-acuminate, those on the branches much smaller and usually involute : primary 

 panicle much exserted, narrow, 5-8 cm. long, its branches erect or nearly so, sometimes 

 spreading in age : spikelets 1.75-2 mm. long and about 1 mm. wide, turgid, broadly obo- 

 void, pubescent with short spreading hairs. [P. ovinum Scribn. & Smith.] 



In dry or moist sandy soil, Virginia to Florida, Texas and the Indian Territory. Also in Cuba. 

 Spring to fall. 



48. Panicum angustifolium Ell. Stems tufted, 3-6 dm. tall, finally profusely 

 branched, glabrous, or sometimes pubescent toward the base : primary leaves usually 4 or 

 5 ; sheaths glabrous, or the lower ones sometimes pubescent ; blades erect, linear-lanceolate, 

 acuminate, glabrous, or the lower ones sometimes pubescent below, ciliate on the margin 

 near the base, 5-12 cm. long, 3-6 mm. wide, those on the branches much smaller, crowded, 

 usually involute : primary panicle broadly ovate, long-exserted, 6-9 cm. long, its branches 

 spreading, glabrous, the secondary panicles much smaller, simple or nearly so : spikelets 

 obovoid, 2.5-3.5 mm. long and 1.3-1.6 mm. broad, strongly nerved, densely pubescent with 

 spreading hairs. [P. arenicoloidea Ashe. P. orthophyllum Ashe.] 



In dry sandy soil, Maryland to Florida and Texas. Spring to fall. 



49. Panicum consanguineum Kunth. A densely villous tufted perennial. Stems 

 3-7 dm. tall, finally much branched, the nodes barbed with spreading hairs : primary leaves 

 usually about 5 ; sheaths shorter than the internodes ; blades erect, linear-lanceolate, the 

 primary ones 4-8 cm. long, 3-10 mm. wide, those on the branches much smaller : primary 

 panicle 4-8 cm. long, oval, its branches ascending : spikelets 2.5 mm. long and about 1.3 

 mm. wide, broadly obovoid, denseh' pubescent with spreading hairs. 



In dry sandy soil, North Carolina to Florida and Texas. Spring and summer. 



50. Panicum arenicola Ashe. Stems tufted, erect, usually from an ascending base, 

 2-4 dm. tall, finally branched, pubescent below with long ascending or nearly erect hairs, 

 minutely pubescent above : leaves 4 or 5, confined to the lower two-thirds of the stem ; 

 sheaths, at least the lower ones, hispid with ascending hairs ; blades erect, firm, stiff, in- 

 clined to become involute in drying, acuminate from below the middle, the lower ones 

 sparingly hispid beneath, 2-6 cm. long, 2-6 mm. wide : panicle long-exserted, broadly 

 ovate, 2-5 cm. long, its branches widely spreading : spikelets a little less than 2 mm. long 

 and about 1.2 mm. wide, broadly obovoid, pubescent with very short spreading hairs. 



lu dry soil, North Carolina to Mississippi, Summer. 



51. Panicum Roanokense Ashe. Glabrous. Stems tufted, erect, 3-5 dm. tall, 

 finally branched : leaves 3 or 4 ; blades erect, rather firm, 3-8 cm. long, 3-5 mm. wide : 

 panicle 5-7 cm. long, its branches ascending : spikelets glabrous, 2 mm. long and 1 mm. 

 wide, elliptic. 



In dry soil, North Carolina. Summer. 



52. Panicum Nashianum Scribn. Stems tufted, glabrous or puberulent, slender, 

 1.5-4 dm. tall, finally much branched : leaf-blades erect or ascending, lanceolate, acumi- 

 nate, glabrous or puberulent beneath, ciliate, at least at the base, 2-5 cm. long, 2-5 mm. 

 wide, the blades on the branches smaller: primary panicle 2.5-5 cm. long, its branches 

 widely spreading : spikelets about 2 mm. long, obovoid, glabrous to densely pubescent with 

 short spreading hairs. [P. pauciciliaium Ashe. ] 



In pine lands, Virginia to Florida and ]Mississippi. Spring and summer. 



53. Panicum patentifolium Nash. A nearly glabrous purplish tufted perennial. 

 Stems erect or nearly so, 2-4 dm. tall, puberulent,'slender, finally much branched : leaves 2-4, 



