264 NORTH AMERICAN FLORA [Volume 17 



spreading, 6-10 cm. long, 5-10 mm. wide, often subinvolute toward the acuminate apex, little 

 narrowed toward the base, pilose on both surfaces, the hairs of the upper surface appressed, 

 longer and less copious ; panicles short-exserted, 4r-8 cm. long, usually as wide, loosely flowered, 

 the spikelets long-pediceled, the axis sparsely pilose, the branches rather stiffly ascending or 

 spreading; spikelets 2.2-2.3 mm. long, 1.1 mm. wide, oblong-elliptic, obtuse or obscurely 

 pointed, papillose-pubescent with spreading hairs; first glume sometimes glabrous, one third 

 to nearly half the length of the spikelet, acute; second glume and sterile lemma subequal, the 

 glume slightly shorter than the fruit at maturity; fruit 1.9 mm. long, 1 mm. wide, elliptic, 

 subacute. 



Autumnal phase at first decumbent, often with geniculate nodes and arched internodes, 

 the first branches appearing at about the maturity of the primary panicle, late in the season 

 prostrate, the leaves of the fascicled brancnlets appressed, giving a combed-out appearance, a 

 character conspicuous in the field but less so in the herbarium; blades not greatly reduced, 

 often with only a few hairs on the upper surface, overtopping the much reduced panicles; 

 winter rosette appearing rather early, the blades long, bluish-green, densely pilose. 



Type I/Ocauty: Ocmulgee River swamp, below Macon, Georgia. 



Distribution: Massachusetts to Minnesota, and south to Florida and eastern Texas; Guate- 

 mala. 



Illustrations: Bull. U. S. Dep. Agr. Agrost. 17: /. 367 (as P. pubescens), f. 372; Contr. U. S. 

 Nat. Herb. 15: ■/. 247; Britt. & Brown, 111. Fl. 3: App. /. 267 j; ed. 2./. 359. 



150. Panicum pseudopubescens Nash, Bull. Torrey Club 26: 577. 



1899. 



Vernal phase similar to that of P. villosissimum; culms somewhat stiffer, the pubescence 

 more silky, appressed on the culms, ascending on the leaf-sheaths; ligule 2-3 mm. long; blades 

 somewhat firmer, the pubescence on the upper surface short like that on the lower and sparse 

 or wanting down the center or the upper surface occasionally glabrous; panicles averaging 

 larger, the spikelets not so long-pediceled; spikelets 2.25-2.4 mm. long, 1.1 mm. wide, obovate- 

 elliptic, obtuse, or slightly pointed; the pubescence as in P. villosissimum; second glume slightly 

 shorter than the fruit at maturity; fruit 1.9 mm. long, 1 mm. wide, elliptic, subacute. 



Autumnal phase usually stiffly spreading, sometimes prostrate; culms sparingly branching 

 from the lower and middle nodes after the maturity of the primary panicle, less freely branch- 

 ing than in P. villosissimum; upper surface of the reduced blades usually glabrous except along 

 the margins and at the base; winter leaves as in P. villosissimum. 



Type i,ocauty: Auburn, Alabama. 



Distribution : Connecticut to Illinois, and south to Florida and Mississippi ; San Luis Potost 

 Illustration: Contr. U. S. Nat. Herb. 15: /. 249. 



151. Panicum ovale Ell. Bot. S. C. & Ga. 1: 123. 1816. 



Panicum ciliiferum Nash, Bull. Torrey Club 24: 195. 1897. 

 Panicum erythrocarpon Ashe, Jour. Elisha Mitchell Soc 16: 90. 1900. 



Vernal plants light olive-green; culms densely tufted, 20-50 cm. high, erect or ascending, 

 rather stout, long-pilose below with ascending or appressed hairs, often nearly glabrous above, 

 usually leafy at the base, the nodes densely bearded with short spreading hairs; leaf-sheaths 

 shorter than the internodes or the lower overlapping, ascending-pilose, the upper less densely 

 so, rarely nearly glabrous; ligule composed of a ring of hairs about 1 mm. long with a second 

 sparse ring 2-3 mm. long above it; blades firm, ascending, 6-10 cm. long, 5-10 mm. wide (the 

 uppermost much smaller), sharply acuminate, rounded at base, the upper surface usually 

 nearly glabrous except for long hairs on or near the margin and base thus giving the blades the 

 appearance of being strongly ciliate, these hairs occasionally wanting except at the base, the 

 lower surface appressed-pubescent; panicles usually short-exserted, 5-9 cm. long, about as 

 wide when fully expanded, the lower branches finally spreading, rarely drooping; spikelets 

 2.7-2.9 mm. long, 1.3 mm. wide, oblong-elliptic, obtuse, pilose, sometimes rather sparsely so; 

 first glume one third to nearly half the length of the spikelet, usually pointed; second glume 

 slightly shorter than the fruit and sterile lemma at maturity; fruit 2.2 mm. long, 1.2 mm. wide, 

 elliptic, obtuse. 



