HITCHCOCK AND CHASE NORTH AMERICAN PANICUM. 



27 



long-exserted, very slender, 



to 20 cm. long, the branches scattered, short, erect, the 

 branchlets bearing 1 or 2 subsessile 

 spikelets, the setiform prolongation 

 of the axis mostly equaling or ex- 

 ceeding the spikelet; spikelets 3.5 

 to 3.8 mm. long, 1.8 to 2 mm. wide, 

 elliptic, turgid, abruptly pointed; 

 first glume about half the length 

 of the spikelet, subacute, strongly 

 5 to 7-nerved; second glume and 

 sterile lemma scarcely equaling 

 the fruit, strongly 5 to 7-nerved; 

 fruit 3.1 to 3.3 mm. long, 1.8 to 

 1.9 mm. wide, elliptic, minutely 

 pointed, obscurely transversely ru- 



Fig. 8.— Distribution of P. reverckon-, 



This species differs from P. rami- 



setum in having longer, narrower 

 Fig. 7.— P. reverchoni. From type specimen. ■, , , , 7 \ ,, 



blades, narrower at the base than 



the summit of the sheath, and larger spikelets, commonly but one to a branchlet, 



hence most of the spikelets subtended by a bristle. 



DISTRIBUTION. 



Rocky or sandy prairies and lime- 

 stone hills, Texas. 



Texas: Dallas, Bebb 1321, Bush 

 674, Reverchon 1096, in Cur- 

 tiss N. Amer. PI. 3618*, L; 

 Abilene, Tracy 7940; Colo- 

 rado, Tracy 7939; Weather- 

 ford, Tracy 7948; Kerrville, 

 Heller 1603; Gillespie County, 

 Jenny 39; Bexar County, 

 Jermy 233, 234; San Antonio, 

 Jermy; southwest Texas, Nealley in 1890; without locality, Wright 792. 



6. Panicum firmulum sp. nov. 



DESCRIPTION. 



Plants light olive green, rather loosely tufted, ascending or decumbent at base, 



from creeping knotted rootstocks as 

 much as 5 cm. long; culms 30 to 

 40 cm. high, simple or with a few 

 appressed branches, glabrous, the 

 nodes glabrous or strigose; sheaths 

 overlapping, striate, papillose-pubes- 

 cent, papillose only, or nearly gla- 

 brous, a tuft of stiff hairs 3 mm. long 

 on the sides at the summit; ligule 

 dense, about 1.5 mm. long; blades 

 ascending or spreading, firm, 4 to 10 

 cm. long, the lower shorter and more 

 spreading, 4 to 7 mm. wide, ab- 

 ruptly acuminate, rounded at the base 

 Fig. 9.-P. firmulum. From type specimen. and wider than the sheath, sparsely 



papillose-ciliate, at least toward the 

 base, scabrous on the upper surface; panicles slender, interrupted, their branches erect, 



