230 NORTH AMERICAN FLORA [Volume 17 



55. Panicum agrostoides Spreng. Pugill. 2: 4. 1815. 



Panicum rigidulum Bosc; (Spreng. Syst. 1: 320, as synonym. 1825) Nees, Agrost. Bras. 163. 



1829. 



Agrostis polystachya Bosc; Steud. Nom. ed. 2. 1: 40, as synonym. 1840. 

 Panicum elongatum ramosius C. Mohr, Contr. U. S. Nat. Herb. 6: 357. 1901. 



Plants in dense clumps, from a short caudex, with numerous shoots of short leaves at the 

 base, erect, glabrous throughout except as noted, 50-100 cm. high or more; culms rather 

 stout, compressed; leaf-sheaths longer than the internodes, keeled, occasionally pilose on the 

 sides at the juncture with the blade; ligule erose, about 1 mm. long; blades erect, conduplicate 

 at the base, but flat above or sometimes drying involute, 20-50 cm. long, rarely longer, 5-12 

 mm. wide; panicles terminal and axillary, finally long-exserted, 10-30 cm. long, rarely longer, 

 usually half to two thirds as wide but occasionally diffuse and nearly as wide as long, the stiff 

 branches ascending or sometimes spreading at maturity, with more or less divergent, densely 

 flowered branchlets, commonly from the lower side, the ultimate branchlets and short pedicels 

 appressed, scabrous, the latter usually bearing at the summit one to several delicate white 

 hairs, these often one fourth to one third as long as the spikelet; spikelets 1.8-2 mm. long, in 

 occasional specimens 2.2 mm. long, 0.7-0.8 mm. wide; first glume hardly half the length of the 

 spikelet; second glume and sterile lemma subequal, 5 -nerved, the midnerves scabrous at the 

 summit; fruit 1.3 mm. long, 0.6 mm. wide. 



Type locality: Pennsylvania. 



Distribution: Maine to Kansas, and south to Florida and Texas; California. 



Illustrations: Torr. Fl. N. Y. pi. 148; Trin. Ic. pi. 261; Vasey, Agr. Grasses U. S. pi. 9; 

 ed. 2. pi, 17; Bull. Tenn. Exp. Sta. 7: pi. 9. f. 33; Britt. & Brown, 111. Fl. /. 249 (as P. agrosti- 

 diforme); ed. 2./. 325; Francis, Book Grasses 74; Contr. U. S. Nat. Herb. 15: /. 92. 



56. Panicum condensum Nash, in Small, Fl. SE. U. S. 93. 1903. 



Plants like P. agrostoides in habit; culms on the average rather taller, sometimes geniculate 

 at base; leaf-sheaths appressed-pubescent along the sides toward the summit or glabrous; 

 blades often sparsely pilose on the upper surface at the conduplicate base; panicles terminal 

 and axillary, 10-25 cm. long, rarely more than 5 cm. wide, the long, solitary or fascicled 

 branches erect, naked at the base, with appressed branchlets bearing crowded spikelets on 

 short, scabrous, but not pilose pedicels, or these occasionally with one or two erect hairs ; spike- 

 lets 2.2-2.5 mm. long, about 0.8 mm. wide, turgid; first glume slightly more than half the 

 length of the spikelet, acuminate; second glume slightly longer than the sterile lemma, both 

 acuminate, the tips slightly spreading, scabrous on the midnerves toward the apex; fruit 

 1.4-1.5 mm. long, about 0.7 mm. wide. 



Type locality: Florida. 



Distribution: New Jersey to Florida and Texas; West Indies. 



Illustrations: Ann. Rep. N. J. Mus. 1910: pi. 12, f. 1; Contr. U. S. Nat. Herb. 15: /. 94; 

 Britt. & Brown, 111. Fl. ed. 2./. 326. 



57. Panicum stipitatum Nash; Scribn. Bull. U. S. Dep. Agr. 



Agrost. 17: ed. 2. 56. 1901. 



Panicum elongatum Fursh, Fl. Am. Sept. 69. 1814. Not P. elongatum Salisb. 1796. 

 Panicum agrostoides elongatum Scribn. Bull. Tenn. Kxp. Sta. 7: 42. 1894. 



Plants like P. agrostoides in habit, often purple- tinged throughout; culms on the average 

 stouter, strongly compressed; leaf-sheaths much overlapping; blades usually equaling or ex- 

 ceeding the terminal panicles, often scabrous on the lower surface; panicles usually several to a 

 culm, sometimes as many as five axillary panicles, commonly dark-purple, short-exserted, 10-20 

 cm. long, one third to half as wide, densely flowered, the numerous stiff branches ascending, 

 with numerous divaricate branchlets mostly from the lower side and beginning at the base, 

 bearing crowded, subsecund spikelets, the short, scabrous pedicels only rarely with one or two 

 erect hairs; spikelets 2.5-2.8 mm. long, about 0.7 mm. wide, often curved at the point; first 

 glume about half the length of the spikelet; second glume and sterile lemma subequal, scabrous 

 on the midnerve at the acuminate apex; fruit about 1.5 mm. long, about 0.6 mm. wide, short- 

 stipitate. 



Type locality: Delaware. 



Distribution: Connecticut to Missouri, and south to South Carolina and Louisiana. 

 Illustrations: Bull. Tenn. Exp. Sta. 7: pi. 9,f. 34; Contr. U. S. Nat. Herb. 15: /. 96; Britt. 

 & Brown, 111. Fl. /. 250; ed. 2. /. 328. 



