HITCHCOCK AND CHASE — NORTH AMERICAN PANICUM. 293 



about three-fourths as wide, the branches few, spreading or ascending; spikelets 3.5 

 to 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 form 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 re- 

 duced. 



DISTRIBUTION. 



Dry woods and prairie, Texas. 

 Texas: Kimble County, Reverchon 

 1620; Kerrville, Heller 1726, 

 1736, 1766, Smith in 1897; Aus- 

 tin, Hall 834 « in part; Coman- 

 che Spring, Lindheimer 1265 

 in Mo. Bot. Gard. distr; "in 

 the Sabines bottom," Lindheimer 158 (last two in Gray Herb.). 



Fig. 330.— Distribution of P. pedicellatum. 



177. Panicum nodatum sp. nov. 



DESCRIPTION. 



Vernal form in tufts from a knotted crown; culms ascending or spreading, slender 

 but hard and wiry, 25 to 35 cm. high, finely papillose, crisp-puberulent; sheaths 

 shorter than the internodes, papillose-hispid between the strong nerves; ligules dense, 

 scarcely 1 mm. long; blades firm, ascending, 3 to 5 cm. long, 3 to 6 mm. wide, broadest 

 at the rounded base, abruptly acute, puberulent on both surfaces, papillose-ciliate 



with stiff hairs 2 to 3 mm. long; 

 panicles 4 to 5 cm. long, half to 

 two-thirds as wide, few-flowered, 

 the few branches ascending ; spike- 

 lets 4 mm. long, 1.7 mm. wide, 

 pyriform, papillose - pubescent; 

 first glume about one-third the 

 length of the spikelet, acuminate; 

 second glume slightly shorter than 

 the fruit and sterile lemma; fruit 3 

 mm. long, 1.4 mm. wide, obovate- 

 elliptic, minutely white-puberu- 

 lent at the apex. 



Autumnal form widely genicu- 

 late-decumbent, early branching 

 from all but the uppermost node, 

 the branches somewhat divaricate, equaling or exceeding the main culm, with 

 numerous swollen nodes, the internodes 2 to 3 cm. long, the whole forming a loose 

 tuft, the blades and panicles not reduced. 



Type U. S. National Herbarium no. 592749, collected August 7, 1904, Sarita, Texas, 

 by A. S. Hitchcock (no. 3865). 



Fig. 331.— P. nodatum. From type specimen. 



« This in the Gray Herbarium is numbered 835. 



