Part 3, 1915] POACBAB 285 



hairs on the nodes; leaf-sheaths papillose, sparingly hirsute, ciliate on the margin; ligule dense, 

 about 1 mm. long; blades ascending or spreading, 5-9 cm. long, 3-6 mm. wide, the margin 

 toward the narrowed base sparsely ciliate with long hairs, both surfaces glabrous or sometimes 

 minutely hispid; panicles 3-6 cm. long, about three fourths as wide, the branches few, spreading 

 or ascending; spikelets 3.5-3.7 mm. long, 1.4 mm. wide, elliptic, prominently papillose-hispid; 

 first glume nearly or quite half the length of the spikelet, narrow, acute; second glume shorter 

 than the fruit and sterile lemma at maturity; fruit 3 mm. long, 1.3 mm. wide, elliptic, subacute. 

 Autumnal phase erect or leaning, branching from all but the uppermost- nodes before the 

 maturity of the primary panicle, the branches slightly divaricate, the blades and panicles not 

 greatly reduced. 



Type locality: Kimble County, Texas. 



Distribution: Texas. 



Illustrations : Bull. U. S. Dep. Agr. Agrost. 17: /. 375; Contr. U. S. Nat. Herb. 15: /. 329. 



203. Panicum nodatum Hitchc. & Chase, Contr. U. S. Nat. Herb. 15: 



293. 1910. 



Vernal phase in tufts from a knotted crown; culms ascending or spreading, slender but hard 

 and wiry, 25-35 cm. high, finely papillose, crisp-puberulent ; leaf -sheaths shorter than the in- 

 ternodes, papillose-hispid between the strong nerves; ligule dense, scarcely 1 mm. long; blades 

 firm, ascending, 3-5 cm. long, 3-6 mm. wide, broadest at the rounded base, abruptly acute, 

 puberulent on both surfaces, papillose-ciliate with stiff hairs 2-3 mm. long; panicles 4-5 cm. 

 long, half to two thirds as wide, few-flowered, the few branches ascending ; spikelets 4 mm. long, 

 1.7 mm. wide, pyriform, papillose-pubescent; first glume about one third the length of the spike- 

 let, acuminate; second glume slightly shorter than the fruit and sterile lemma; fruit 3 mm. 

 long, 1.4 mm. wide, obovate-elliptic, minutely white-puberulent at the apex. 



Autumnal phase widely geniculate-decumbent, early branching from all but the upper- 

 most node, the branches somewhat divaricate, equaling or exceeding the main'culm, with 

 numerous swollen nodes, the internodes 2-3 cm. long, the whole forming a loose tuft, the blades 

 and panicles not reduced. 



Type locality: Sarita, Texas. 

 Distribution: Texas and adjacent Mexico. 

 Illustration: Contr. U. S. Nat. Herb. 15: /. 331. 



204. Panicum cordovense Fourn. Mex. PL Gram. 26. 1886. 



Panicum expansum Fourn. Mex. PL Gram. 26. 1886. 



Ichnanthus apiculatus Scribn. Circ. U. S. Dep. Agr. Agrost. 30: 1. 1901. 



Panicum missionum Ekman, Ark. Bot. II 4 : 19. 1912. 



Plants perennial in tangled masses; culms slender, subcompressed, with a line of pubes- 

 cence down one side or glabrous, rarely sparsely pilose, straggling, widely creeping, rooting at 

 the lower nodes, as much as 2 meters long, freely branching, the branches usually divergent, 

 becoming nearly as long as the primary culm; nodes puberulent or glabrate; leaf-sheaths much 

 shorter than the usually elongate internodes, sparsely papillose-pilose or papillose only, densely 

 ciliate on the margin, puberulent at the juncture with the blade; ligule about 0.3 mm. long; 

 blades thin, flat, spreading, 5-10 cm. (rarely as much as 15 cm.) long, 5-10 mm. wide, narrowly 

 lanceolate, acuminate, rounded and usually ciliate at base, scaberulous on both surfaces at 

 least on the midnerve, usually papillose-hispid above the ligule, sometimes sparsely so through- 

 out; panicles of two kinds, the primary short-exserted or included at base, loose and open, 

 10-15 cm. long, half to two thirds as wide, the axis and branches slender, subflexuous, scaberu- 

 lous, pubescent in the axils, the few branches solitary or in pairs, remote, simple or nearly so, 

 finally spreading, few-flowered, the branches and short-pediceled apparently unfruitful spike- 

 lets more or less appressed to the rachis, the secondary panicles terminal on the branches, 

 reduced, narrow, few-flowered, partially enclosed in the sheath, the crowded, apparently 

 cleistogamous spikelets fruitful; spikelets 3-3.5 mm. long, 1.2-1.4 mm. wide, those of the 

 primary panicles usually glabrous, those of the secondary panicles usually pustulose-villous, 

 turgid; first glume about two thirds as long as the spikelet, obtuse, 3-5-nerved; second glume 

 and sterile lemma equal, covering the fruit, 7-nerved, the middle internerves of the sterile 



