284 NORTH AMERICAN FIvORA [Vowjsm 17 



200. Panicum latifolium L. Sp. PL 58. 1753. 



Milium latifolium Moench, Meth. 204. 1794. 



Panicum macrocarpon LeConte; Torr. Cat, PI. N. Y. 91. 1819. 



Panicum Schnecki Ashe, Bull. N. Car. Exp. Sta. 175: 116. 1900. 



Vernal plants in clumps of few to several culms from a knotted crown; culms rather stout, 

 45-100 cm. high, erect, glabrous, or the lower internodes sometimes sparsely pubescent, 

 the nodes glabrous, rarely with a few hairs; leaf -sheaths shorter than the internodes, ciliate on 

 the margin, a pubescent ring at the juncture with the blade, otherwise glabrous, or the lower 

 sparsely downy; ligule nearly obsolete; blades rather thin, ascending or spreading, 8-18 cm. 

 long, 1.5-4 cm. wide, the lower smaller, acuminate, cordate-clasping at the base, glabrous, rarely 

 sparsely pubescent on one or both surfaces, short-ciliate at least toward the base; panicles 

 usually short-exserted or sometimes finally long-exserted, 7-15 cm. long, about two thirds as 

 wide, the long, few-flowered, nearly simple branches stiffly ascending; spikelets rather short- 

 pediceled, commonly more or less clustered in twos or threes, 3.4-3.7 mm. long, 1.8-2 mm. 

 wide, oval-obovate, turgid, sparsely pubescent; first glume one third to half the length of the 

 spikelet, pointed; second glume and sterile lemma scarcely covering the fruit at maturity; 

 fruit 3 mm. long, 1.6-1.8 mm. wide, elliptic, minutely pubescent on the obscurely apiculate apex. 



Autumnal phase more or less spreading, branching from the middle nodes, the upper 

 leaves of the branches crowded and spreading, not much reduced, the small panicles partly 

 included. 



Type locality: Northeastern United States. 



Distribution: Maine to Minnesota, and south to North Carolina and Kansas. 



Illustrations : Contr. U. S. Nat. Herb. 15: /. 355; Britt. & Brown, 111. Fl./. 256; ed. 2./. 384. 



201. Panicum Boscii Poir. in Lam. Encyc. Suppl. 4: 278. 1816. 



Panicum Waltheri Poir. in Urn. Encyc. Suppl. 4: 282. 1816. Not P. Walteri Pursh, 1814. 



Panicum latifolium australe Vasey, Bull. U. S. Dep. Agr. Bot. 8: 34. 1889. 



Panicum latifolium molle Vasey, Bull. U. S. Dep. Agr. Bot. 8: 34. 1889. 



Panicum Walteri molle Porter, Bull. Torrey Club 20: 194. 1893. 



Panicum Porterianum Nash, Bull. Torrey <Club 22: 420. 1895. 



Panicum pubifolium Nash, Bull. Torrey Club 26: 577. 1899. 



Panicum Boscii molle Hitchc. & Chase; B. L,. Robinson, Rhodora 10: 64. 1908. 



Vernal phase resembling that of P. latifolium, usually in larger clumps; culms 40-70 cm. 

 high, erect or ascending, glabrous or minutely puberulent, rarely somewhat papillose, the nodes 

 retrorsely bearded; leaf-sheaths much shorter than the internodes, ciliate, a pubescent ring at 

 the juncture with the blade, otherwise glabrous or sparsely downy-pilose; ligule about 1 mm. 

 long; blades spreading, 7-12 cm. long, 1.5-3 cm. wide, more or less tapering toward the sparsely 

 ciliate, cordate base, acuminate, glabrous on both surfaces or puberulent on the lower and 

 sparsely pubescent on the upper surface; panicles 6-12 cm. long, as wide or wider, the main 

 axis and the flexuous spreading or ascending branches puberulent; spikelets 4-4.5 mm. long, 

 2-2.2 mm. wide, oblong-obovate, less turgid than in P. latifolium, papillose-pubescent; first 



■ 



glume one third to two fifths the length of the spikelet, pointed; second glume slightly shorter 

 than the fruit and sterile lemma at maturity; fruit 3.2-3.5 mm. long, 1.5-1.6 mm. wide, elliptic, 

 minutely pubescent, and usually black at the tip. 



. Autumnal phase as in P. latifolium, rather more freely branching, sometimes topheavy- 

 reclining; spikelets more turgid than those of the primary panicles. 



Typb locality: Carolina. 



Distribution: Massachusetts to Missouri, and south to Florida and Texas. 

 Illustrations: Bull. U. S. Dep. Agr. Agrost. 17: /. 396 (as P. latifolium); Contr. U. S. Nat. 

 Herb. 15: /. 357; Britt. & Brown, 111. Fl, ed. 2. /, 385. 



Panicum Boscii molle {Panicum pubifolium) is a more downy- villous form. Illustrations : Bull. 

 Tenn. Exp. Sta. 7: pi. 12, f. 45 (as P. latifolium) ; Contr. U. S. Nat. Herb. 15: /. 359; Britt. & Brown, 

 111. Fl. /. 254 (as P. Porterianum). 



202. Panicum pedicellatum Vasey, Bull. U. S. Dep. Agr. Bot. 8: 28. 



1889. 



Vernal phase in tufts of few to several erect or ascending culms from a short, knotted root- 

 stock; culms slender, 20-50 cm. high, usually ascending-hirsute at least below, a few spreading 



