100 POACEAE 



elliptic, 1.5 mm. long, pubescent. [P. Albemarlense Ashe. P. microphyllum A she. P. 

 subvillosum Ashe.] 



In dry soil, New Jersey to Georgia. Summer. 



87. Panicum unciphyllum Trin. Stems at first erect and simple, later profusely 

 branched and leaning or ascending, glabrous or pubescent : leaf-sheaths hirsute, often 

 papillose ; blades hirsute, especially beneath, erect or spreading, those on the main stem 

 5-8 cm. long, those on the branches much shorter : primary panicle less than 8 cm. long, 

 ovoid, its branches ascending, the lateral panicles much smaller : spikelets hardly 2 mm. 

 long, pubescent. [P. pubescens A. Gray, not. Lam.] 



In dry soil, common, Maine and Quebec to British Columbia, Georgia, the Indian Territory and 

 Arizona. Summer. 



88. Panicum Lindheimeri Nash. A nearly glabrous perennial. Stems 3-5 dm. 

 tall, finally much branched : primary leaves 5-7 ; sheaths shorter than the internodes, 

 ciliate on 'the margin, usually sparingly tuberculate-hirsute ; blades ascending, lanceolate, 

 acute, smooth on both surfaces, usually 2-7 cm. long, sometimes longer, 4-10 mm. wide : 

 primary panicle 3-5 cm. long, broadly ovate or oval, its branches spreading : spikelets about 

 1.5 mm. long and about 0.8 mm. wide, broadly obovoid, pubescent with spreading hairs. 



In dry soil, Georgia to Texas and the Indian Territory. Spring and summer. 



89. Panicum sphaerocarpon Ell. Stems generally erect, simple or somewhat 

 branched at the base, 2.5-6 dm. tall, glabrous : leaf -sheaths usually shorter than the inter- 

 nodes, glabrous, the margins ciliate ; blades 5-10 cm. long, 4-14 mm. wide, rough above, 

 smooth beneath, the margins cartilaginous and minutely serrulate, ciliate toward the base : 

 panicle ovoid, 5-10 cm. long : spikelets less than 2 mm. long, nearly spherical, or a little 

 longer than thick, obtuse. 



In dry soil, southern Ontario, New York and Missouri to Florida, Texas and Mexico. Summer and 

 fall. 



90. Panicum iiiflatum Scribn. & Smith. Stems 3-4 dm. tall, branched, finally pros- 

 trate and rooting at the lower nodes : sheaths compressed, inflated, very loosely embracing 

 the stem, strongly striate, marked with white tubercles, ciliate on the margin ; blades as- 

 cending, lanceolate, ciliate at the base, 3-7 cm. long, 7-10 mm. wide, 'flat, acuminate into an 

 obtuse point : panicle much exserted, 6-8 cm. long, oval, its branches ascending : spikelets 

 oval, 1.3 mm. long and about 0.9 mm. wide, minutely and sparsely pubescent. [P. Mississip- 

 piense Ashe.] 



In sandy soil, Mississippi. Fall. 



91. Panicum erectif olium Nash. A nearly glabrous tufted perennial. Stems erect, 

 5-7 dm. tall, finally sparingly branched, the branches erect : primary leaves usually 5-7 ; 

 sheaths usually about as long as the internodes, ciliate on the margins ; blades erect, 

 firm, ciliate on the margins toward the base, lanceolate, acuminate, 5-10 cm. long, 5-13 

 mm. wide : panicle elliptic, 8-12 cm. long, its branches erect-ascending : spikelets numer- 

 ous, 1-1.3 mm. long and 0.6-0.8 mm. wide, elliptic to oval, pubescent with spreading 

 hairs. [P. Floridanum Chapm.] 



In wet soil or swamps, Florida to Mississippi. Spring and summer. 



92. Panicum polyanthes Schult. Stems generally erect, 6-9 dm. tall, simple, gla- 

 brous : leaf -sheaths glabrous, longer than the internodes ; blades 1-2 dm. long, 1-2.5 

 cm. wide, long-acuminate, smooth, cordate-clasping and sparingly ciliate at the base : 

 panicle 7-20 cm. long, ovoid to oblong, its branches slender, ascending : spikelets 1.5 mm. 

 long, obovoid to nearly spherical, numerous, puberulent. [P. mkrocarpon Muhl.] 



In woods and along thickets, southern New York and Pennsylvania to Michigan, Florida, Louis- 

 iana, Nebraska and Texas. Summer and fall. 



93. Panicum cbrysopsidif olium Nash. Stems tufted, 2.5-5 dm. tall, stout, finally 

 branched, strongly pubescent below with long stiff' nearly appressed hairs, the upper por- 

 tion sparingly pubescent : leaves 5 or 6 ; sheaths papillose-hirsute with ascending hairs ; 

 blades lanceolate, acuminate, 3-12 cm. long, 3-10 mm. wide, thick, firm, rather sparingly 

 papillose-hirsute on both surfaces with long spreading stiff hairs : panicle 5-7 cm. long, 

 broadly ovoid, its branches spreading: spikelets about 2 mm. long and 1.2 mm. wide, 

 broadly obovoid, coarsely and strongly nerved, pubescent with short spreading hairs. 



In dry sandy soil, middle Florida. Spring. 



94. Panicum pseudopubscens Nash. A densely tufted pubescent perennial. Stems 

 2-4 dm. tall, . hirsute with ascending hairs, finally branched, the nodes barbed : leaves 

 usually 3 ; sheaths densely hirsute with spreading hairs ; blades erect, rather firm, lanceo- 

 late, 4-10 cm. long, 3-11 mm. wide, densely hispid on the lower surface with spreading 

 hairs, the upper surface with long stout hairs at the base : panicle 5-9 cm. long, broadly 

 ovoid, its branches ascending or spreading: spikelets 2.25-2.5 mm. long and 1-1.2 mm. 

 wide, obovoid, densely pubescent with spreading hairs. 



In sandy soil, Alabama. Spring and summer. 



