HITCHCOCK AND CHASE NOETH 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 mi 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. 



Distribution of P. combsii. 



Margins of ponds and wet woods, Geor- 

 gia to Florida, and west to Louisiana. 



Georgia: Tifton, Harper 1679; Douglas, Harper 2014, Huntington, Harper 1081. 

 Florida: Pensacola, Curtiss 6919; Argyle, Curtiss 6925A; Chipley, Combs 583; 



without locality, Chapman. 

 Alabama: Gateswood, Tracy 8408. 

 Mississippi: Biloxi, Tracy 4568 in part. 

 Louisiana: Lake Charles, Chase 4434. 



55. Panicum anceps Michx. 



Panicum- anceps Michx. Fl. Bor. Amer. 1: 48. 1803. "Hab. in Carolinae herbosis 

 humidis sylvaticis. " The type specimen, labeled "Panicum anceps, Hab. in her- 

 bosis humidis Carolinae, Virginiae, Georgiae, " is in the Michaux Herbarium. 



Panicum rostratum Muhl.; Willd. Enum. PI. 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 a published P . rostratum as a new 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 ete 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 b refers his A. nutans. 



Panicum nutans Desv. Opusc. 93. 1831. Based on "Agrostis 

 nutans Poir. Enc. suppl. " 



Panicum anceps angusta[um]Y&sey, U. S. Dept. Agr. Div. 

 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. S. 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, 



Fig. 102.— P. anceps. 

 type specimen 



From 



Descr. Gram. 121. 1817. 



In Lam. Encycl. Suppl. 5: 539. 1817. 



