166 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Autumnal blades involute; lower panicle branches more 
or less ascending. 
Spikelets 3.3 to 3.5 mm. long, pointed............... 95. P. fusiforme. 
Spikelets less than 3 mm. long, not pointed, or ob- 
scurely so. 
Plants glabrous or nearly so; autumnal culms 
erect. 
Spikelets subsecund along the suberect pan- 
icle branches. .......-.-.-.---------- 98. P. neuranthum. 
Spikelets not subsecund; panicle loose and 
OPEN... ee ee eee ee eee 97. P. ovinum. 
Plants pubescent, at least on the lower half. 
Spikelets about 2.4 mm., rarely only 2.1 mm. 
long; vernal blades 7 to 12 cm. long; 
autumnal blades not falcate........-- 96. P. arenicoloides. 
Spikelets not over 2 mm. long; vernal blades 
4 to6cm. long, autumnal blades much 
crowded, falcate.............-0--- eee 91. P. aciculare. 
91. Panicum aciculare Desv. 
Panicum aciculare Desv.; Poir. in Lam. Encycl. Suppl. 4: 274. 1816. ‘‘Cette 
plante croft dans les Indes orientales. (V.s. in herb. Desv.)’’ Poiret cites ‘‘P. acicu- 
lare Desv. Herb.’”’ The type is in the Paris Herbarium. It is from the Desvaux 
Herbarium and is labeled in Desvaux’s handwriting ‘‘Panicum aciculare Desv. in 
Enc. Suppl. 4. p. 274. habitat in india orientali.’’ It is the autumnal form and is evi- 
dently the specimen described. The locality is certainly an error, as no such plant is 
known from the East Indies, and the specimen is without doubt from the southeastern 
United States.¢ , 
Panicum setaceum Muhl. Descr. Gram, 99.1817. ‘‘Habitat in Georgia.’’ The type, 
in the Muhlenberg Herbarium, is in a folio marked: ‘‘151 Panicum pungens M. 97 
Elliott, 358.”” Panicum pungens in the herbarium stands in the same relation to the 
other species as does P. setaceum in Muhlenberg’s book.> In the herbarium folio 151 
is the first of the Panicums. In the book P. setaceum is the first species described under 
this genus. Likewise the sequence in the two places is essentially the same. The 
specimen, which is the autumnal form, agrees with Muhlenberg’s description of P. 
setaceum. 
Panicum subuniflorum Bosc; Spreng. Syst. Veg. 1: 312. 1825. ‘‘Carolin.’’ In the 
Delessert Herbarium is a specimen from ‘‘Carolina” collected by Bose. In the Will- 
denow Herbarium is another fragmentary specimen labeled P. subuniflorum Bosc, but 
without locality or collector. The latter may be the type. 
Panicum arenicolum{cola] Ashe, Journ. Elisha Mitchell Soc. 15: 56. 1898. ‘‘Type 
material collected by the writer at Chapel Hill, N. C. June 1898.’ The type could 
not be found in Ashe’s herbarium. In Hitchcock’s herbarium is a specimen labeled 
‘Panicum arenaecolum Ashe” collected in the vicinity of Chapel Hill, North Carolina, 
by W. W. Ashe, and sent by him to Professor Scribner. The date of collection is not 
given. This specimen, which is probably a duplicate type, consists of two vernal 
culms, somewhat appressed-pubescent below; the stiffly ascending blades are gla- 
brous except the lowermost, which is sparsely pubescent beneath. 
Panicum filiram{eJum Ashe, Journ. Elisha Mitchell Soc. 16: 88. 1900. ‘‘Sandy 
woods, eastern North Carolina. Type material collected in New Hanover County, 
@ Several cases of erroneous localities occur in Desvaux’s herbarium. See Panicum 
illinonense Desv. under P. fasciculatum. 
6Compare U.S. Dept. Agr. Div. Agrost. Cire. 27: 2. 1900. 
