579 Nash : The dichotomous Panicums 



tributed as P. Waltcri mollc) ; Knoxville, July, 1898, A. Ruth, no. 

 y^ (distributed as P. Portcrianuni). 



Georgia : Stone Mt., Aug. 1-6, 1895, /. K. .S";//rt// (distributed 

 as P. Portcriamivi). 



Readily distinguished from P. Portcriaiium by the pubescent 

 sheaths and the lower surface of the blades and the hirsute panicle. 



Panicum pyriforme 



A densely tufted perennial. Culms 3—4 dm. tall, rather slender, 

 glabrous, rather weak, finally much branched ; leaves usually 2, 

 or sometimes 3 ; sheaths much shorter than the internodes, densely 

 papillose-hirsute with reflexed hairs ; ligule a ring of hairs about 

 0.3 mm, long; blades thin, lax, glabrous on both surfaces, serru- 

 late and very rough on the glabrous margins, long-acuminate, 

 narrowed to the barely rounded base, 1—2 dm. long, 8—12 mm. 

 wide, the basal ones often 2.5 dm. in length, the blades on the 

 branches much shorter : panicle much exserted, ample, loose and 

 open, 6—1 1 cm. long, its branches widely spreading, the larger ones 

 4-6 cm. long: spikelets rather few, about 2.5 mm. long and 1.5 

 mm. wide, broadly obovate, the first scale about one third as long 

 as the spikelet, broadly triangular-ovate, i -nerved, the second and 

 third scales densely pubescent with long hairs, 9-nerved, the fourth 

 scale yellowish white, about 2 mm. long and 1.5 mm. wide, oval, 

 strongly apiculate. 



Type collected by the writer in clay soil, at Orange Bend, 

 Lake Co., Florida, March 12 31, 1894, no. 239. The larger 

 spikelets and glabrous blades at once distinguish this from P. loxi- 

 floniin, to which it is otherwise related. The following numbers of 

 my collection of 1895 are also referred here: 2034, 2156, 2531a. 



Panicum strictifolium 



A tufted perennial. Culms 2.5—5 dm. tall, strongly pubescent 

 toward the base with long stiff hairs, puberulent toward the summit, 

 finally much branched : leaves 3 or 4 ; sheaths much shorter than 

 the internodes, the lower ones densely pubescent with long stiff ap- 

 pressed hairs, the upper ones more sparingly so ; ligule a dense 

 ring of hairs about 1 mm. long ; blades erect or nearly so, rather 

 firm, narrowly lanceolate, appressed -pubescent beneath with stiff 

 hairs, the upper surface often with a few scattered long hairs, the 

 lower blades also with a ring of very long stiff hairs just back of 

 the ligule, serrulate and rough on the margins, the primar)- blades 

 4—7 cm. long, 3-5 mm. wide : panicle broadly ovate, 5-7 cm. long, 

 its axis and spreading branches minutel}' pubescent, the lower 



