575 Nash : The dichotomous Panicums 



as the spikelet, the second and third scales pubescent with spread- 

 ing hairs, 7 -nerved, the fourth scale white, a little exceeding 2 mm. 

 in length, oval, minutely pubescent at the apex. 



Type collected by the writer at Eustis, Lake Co., Florida, 

 March 12-31, 1894, no. 72, in dry sand in a scrub hammock. No. 

 52 of the same collection also belongs here. 



Related to P. Wcbberianiun, but the more slender culms and 

 the smaller and widely spreading blades readily separate it. 



Panicum perlongum 



A tufted pubescent perennial. Culms 2-4 dm. tall, simple, 

 glabrous or sparingly pubescent, the nodes barbed, later with short 

 basal culms : leaves i or 2 ; sheaths hirsute with long ascending 

 hairs; ligule a dense ring of hairs about 0.7 mm. long ; blades 

 elongated, linear, erect, papillose-hispid beneath, glabrous, rough 

 above, 2-3 mm. wide, the upper blade commonly 8-14 cm. long, 

 occasionally shorter : panicle much exserted, generally extending 

 beyond the apex of the upper leaf, 4-6 cm. long, its branches erect 

 or erect-ascending, the larger ones usually 2-3 cm. long : spike- 

 lets, on hispidulous pedicels, obovate, about 3.25 mm. long and 

 i.c^-x.j^ mm. wide, the outer 3 scales with a few scattered long 

 hairs, especially near the base, the first scale one quarter to one 

 third as long as the spikelet, orbicular-ovate, i -nerved, the second 

 and third scales 9-nerved, about equal in length, the fourth scale 

 oval, 2.5 mm. long and about 1.5 mm. wide, yellowish white, ob- 

 tusely apiculate, its summit reaching the apex of the third scale. 



On prairies and dry soil, Illinois to North Dakota, south to 

 Indian Territory. Type collected in Indian Territory at Creek 

 Nation, by M. A. Carlton. April 25, 1891, no. 98, and distributed 

 as P. depanperatttm Muhl. It differs from that species in the 

 smaller pubescent obtuse spikelets with the second and third scales 

 not exceeding the fourth scale. From P. liiicarifoliuni, to which it 

 is more nearly related, it is separated by its larger sparsely pubes- 

 cent spikelets. 



The following specimens, distributed as P. depmiperatuvi Muhl., 

 are also referred here : 



Illinois: June 7, 1848, 5. B. Mead. 



South Dakota: Custer, July 18, 1892, P. A. Rydberg, no. 



7/00. 



Iowa: Ames, June 22, 1896, C. R. Ball, no. /yj. 



Kansas: Prairie, Riley Co., 1896, A. S. Hitchcock, no. 881. 



