HITCHCOCK AND CHASE—NORTH AMERICAN PANICUM. 93 
Soutn Carouna: Elgin, House 2575; Camden, House 2668. 
GrorGiA: Camp Cornelia, Ricker 936; Augusta, Cuthbert 1015, Small in 1895. 
Frorma: Homosassa, Combs 930; Cedar Key, Combs 774; Jensen, Hitchcock 743; 
Sanibel Island, Hume 37; Miami, Chase 3859, 3860; Big Pine Key, Simpson 
300. 
Misstsstppr: Scranton, Pollard 1201; Biloxi, Tracy 3762 in part. 
Bermupas: Stone in 1888 (Acad. Phil. Herb.). 
Cusa: Batabano, Hitchcock 153; Palmer & Riley 1134; without locality, Wright 
3873. 
ON 
© 45. Panicum havardii Vasey. 
Panicum virgatum macranthum Vasey, Bull. Torrey Club 13: 26. 1886, not Panicum 
macranthum Trin, 1826. ‘‘Col- 
lected by Dr. Havard, in the 
Guadalupe Mountains, Tex- 
as.”’ The type, in the Na- 
tional Herbarium, collected in 
1881, is labeled in Vasey’s 
hand with the data as pub- 
lished. It consists of the up- 
per portion of a robust culm, 
the large and open panicle 
measuring 40 cm. long and 30 
em. wide, the spikelets nearly 
7 mm. long. 
Panicum havardii Vasey, Bull. 
Torrey Club 14: 95. 1887. 
Based upon the type of 
Panicum virgatum macranthum 
Vasey. 
DESCRIPTION. 
Plants 1 meter or more tall, 
pale green, glaucous, glabrous 
throughout; culms robust, sol- 
itary, erect from creeping rootstocks, simple; sheaths longer than the internodes; 
ligules dense, about 3 mm. long; blades erect or ascending, 25 to 40 cm. long, 5 to 10 
mm. wide, broadest at the base, tapering into long, involute-setaceous tips, some- 
times pilose on the upper surface at the base; panicles short-exserted, as much as 
40 cm. long, half tc three-fourths as 
wide, loosely flowered, the mostly ver- 
ticillate branches ascending or finally 
spreading; spikelets 6 to 8 mm. long, 
about 2 mm. wide, ovate, acuminate, 
strongly nerved; first glume clasping, 
half to two-thirds the length of the 
spikelet, acuminate; second glume 
slightly shorter than the sterile lemma, 
both exceeding the fruit, 7 to 9-nerved; 
fruit 4.5 to 5 mm. long, about 1.8 mm. 
wide, narrowly ovate, the margin of 
the lemma inrolled only at base. 
This apparently rare species resembles P. virgatum from which it differs in the 
decumbent base of the solitary culms and in the larger spikelets, 
Fic. 83.—P. havardit. From type specimen. 
Fic. 84.—Distribution of P. havardii. 
