HITCHCOCK AND CHASE NOETH AMERICAN PANICUM. 



93 



South Carolina: Elgin, House 2575; Camden, House 2668. 



Georgia: Camp Cornelia, Richer 936; Augusta, Cuthbert 1015, Small in 1895. 



Florida: Homosassa, Combs 930; Cedar Key, Combs 774; Jensen, Hitchcock 743; 



Sanibel Island, Hume 37; Miami, Chase 3859, 3860; Big Pine Key, Simpson 



335. 

 Mississippi: Scranton, Pollard 1201; Biloxi, Tracy 3762 in part. 

 Bermudas: Stone in 1888 (Acad. Phil. Herb.). 

 Cuba: Batabano, Hitchcock 153; Palmer & Riley 1134; without locality, Wright 



3873. 



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 fountains, 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 

 cm. wide, the spikelets nearly 

 7 mm.- long. 



PanicumhavardiiY&sey, 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 to three-fourths as 



Fig. 83.— P. havardii. From type specimen. 



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. 



Fig. 84.— Distribution of P. havardii. 



