HITCHCOCK AND CHASE — NORTH AMEEICAN 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 l)ut 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, J^ewrcAon 

 1620; Kerrville, Heller 1726, 

 1736, 1766, Smith in 1897; Aus- 

 tin, Hall 834 a in part; Coman- 

 che Spring, Lindheimer 1265 Fig. 330.-Distribution of P. pedicetowm-. 

 in Mo. Bot. Gard. distr; "in 

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



i/ 177. Panicum nodatum sp. nov. 



DESCEIPTION. 



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 - pubesceht; 

 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). 



« Thifl in the Gray Herbarium is numbered 835. 



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



