100 POACEAE 



elliptic, 1.5 mm. long, pubescent. [P. Albunarlense Ashe. P. inicrophyUuui Aslie. P. 

 subvillosum Ashe. ] 



In dry soil, New Jersey to Georgia. Summer. 



87. Panicuni 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, tliose on the main stem 



5-8 cm. long, those on the branches much shorter : primary j)anicle 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 Ijranched : i)rimary leaves 5-7 ; sheaths shorter than the internodes, 

 ciliate on the margin, usually s})aringly 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 inflatum 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 nmi. long and about 0.9 mm. wide, minutely and sparsely pubescent. [P. Missmip- 

 piense Ashe.] 



In sandy soil, Mississippi. Fall. 



91. Panicum erectifolium Nash. A nearly glabrous tufted pereimial. Stems erect, 

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

 sheaths usually about i 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. F lor ida7ium (Jha.pm.'\ 



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



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



l)rous : 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. microcarpon Muhl.] 



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

 iana, Nebraska and Texas. Summer and fall. 



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

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

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

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

 papillose-hirsute on both siu'faces 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 witii short spreading liairs. 



In dry sandy soil, middle Florida. Spring. 



94. Panicum pseudopub6scens Nash. A densely tufted pubescent perennial. Stems 

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

 usually 3 ; sheatlis densely hirsute witli spreading hairs ; blades erect, rather firm, lanceo- 

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

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

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

 wide, ol)ovoid, densely pubescent with spreading liairs. 



In sandy soil, Alabama. Spring and summer. 



