HITCHCOCK AND CHASE—-NORTH AMERICAN PANICUM. 107 
spikelets 3 to 3.5 mm. long, 0.7 to 0.8 mm. wide, acuminate; first glume two-thirds to 
three-fourths the length of the spikelet; second glume and sterile lemma subequal, 
usually scabrous on the midnerve, 
much exceeding the fruit; fruit 1.8 to 2 
mm. long, 0.6 to 0.8 mm. wide. 
This species is closely related to P. 
longifolium from which it may be dis- 
tinguished by its shorter blades, longer 
spikelets, and usually by the lack of 
pubescence. 
DISTRIBUTION. 
Margins of pondsand wet woods, Geor- 
gia to Florida, and west to Louisiana. 
Fia. 101.—Distribution of P. combsii. 
Gzorata: Tifton, Harper 1679; Douglas, Harper 2014, Huntington, Harper 1081. 
Fioripa: Pensacola, Curtiss 6919; Argyle, Curtiss 6925A; Chipley, Combs 583; 
without locality, Chapman. 
ALABAMA: Gateswood, Tracy 8408. 
Mississippt: Biloxi, Tracy 4568 in part. 
Lourstana: Lake Charles, Chase 4434. 
55. Panicum anceps Michx. 
Panicum anceps Michx. Fl. Bor. Amer. 1: 48. 1803, ‘‘Has. in Carolinae herbosis 
humidis sylvaticis.”” The type specimen, labeled ‘‘Panicum anceps, Hab. in her- 
bosis humidis Carolinae, Virginiae, Georgize,” is in the Michaux Herbarium. 
Panicum rostratum Muhl.; Willd. Enum. Pl. 1032. 1809. ‘‘ Habitat in sylvaticis 
humidis Pensylvaniae, Carolinae.” The type specimen, in the Willdenow Herbarium, 
is marked ‘‘P. rostratum Am. Boreal. Muhlenberg.” Muh- 
lenberg later? published P. rostratum as anew species. The 
specimen in the Muhlenberg Herbarium is the same species 
as the one sent to Willdenow. 
Agrostis nutans Poir. in Lam. Encycl. Suppl. 1: 255. 
1810. ‘Cette plante a été recueillie dans la Caroline, par 
M. Bosc.” We have not seen this specimen, but the de- 
scription applies well to P. anceps, to which species Poiret 
later ® refers his A. nutans. 
Panicum nutans Desv. Opusc. 93.1831. Based on ‘‘ Agrostis 
nutans Poir. Enc. suppl.” 
Fic. 102.—P. anceps. From Panicum anceps angusta[um] Vasey, U.S. Dept. Agr. Div. 
type specimen. Bot. Bull. 8: 37. 1889. “Texas (G. C. Nealley).” The 
type specimen, in the National Herbarium, is a tall plant with an immature panicle, 
the long blades involute. 
Panicum anceps densiflorum Vasey, U. 8. Dept. Agr. Div. Bot. Bull. 8:37. 1889. 
“Texas (J. F. Riggs).” The type specimen, in the National Herbarium, was collected 
November, 1884, Marshall, Texas, by J. F. Riggs, no. 91. It consists of the upper por- 
tions of two robust plants, the panicle branches densely flowered. 
DESCRIPTION. 
Plants in tufts of few to many culms, 50 cm. to 1 meter or more high, with numerous 
stout, scaly rootstocks; culms usually robust, not strongly compressed, glabrous; 
sheaths usually shorter than the internodes, glabrous to densely papillose-pilose, 
@ Descr. Gram. 121. 1817. 6 In Lam. Encycl. Suppl. 5: 539. 1817. 
