210 



CONTRIBUTIONS FEOM THE NATIONAL HERBAKIUM. 



Culms leafy below, branching 

 from base and lower nodes ; 



Maine to Minn 132. 



Culms evenly leafy, branch- 

 ing from upper nodes; 



Pacific slope 134. 



Upper surface of blades appressed- 

 pubescent or pilose toward the 

 base only; spikelets 1.6 to 1.8 

 mm. long; autumnal form not de- 

 cumbent-spreading. 



Blades stiff, erect 124. P. 



Blades lax, spreading 124a. P. 



P. subvillosum. 



P. pacificum. 



huachucae. 

 huachucae sil- 



vicola. 



Spikelets 2.2 mm. or more long. 

 Spikelets 2.2 to 2.4 mm. long. 



Pubescence on culms horizontally spreading; autum- 

 nal form freely branching 137. P. villosissimum. 



Pubescence on culms appressed or ascending; autum- 

 nal form rather sparingly branching. 

 Upper internodes shortened, the leaves approxi- 

 mate, blades often equaling the panicle; 



pubescence sparse and stiff 140. P. scoparioides. 



Upper internodes not shortened, the copious 



pubescence silky 138. P 



Spikelets 2.7 to 2.9 mm. long. 



Culms stiff; blades conspicuously ciliate; southern 



Atlantic coast 139. P. ovale. 



Culms weak; blades not ciliate; Pacific coast 141. P. shastense. 



pseudopubes- 

 cens. 



121. Panicum meridionaie Ashe. 



Panicum meridionaie Ashe, Journ. Elisha Mitchell Soc. 15: 59. 1898. "North Caro- 

 lina, Chapel Hill in June, 1898; and Jonas Ridge, Burke Co., June, 1893. * * * 

 Dry rocky woods." The type could not be found in Ashe's herbarium. In the 

 National Herbarium are two specimens, one from Chapel Hill and one from Burke 

 County, collected by Ashe and labeled in his writing as this species. The first speci- 

 men is a tuft of very slender vernal culms, each bearing but three distant leaves, with 

 panicles 2 to 3 cm. long. This specimen does not agree so well with the description 

 as the Burke County plant, which is therefore chosen to represent the type. In this 

 the culms are numerous, less delicate, erect, 10 to 15 cm. high. The spikelets are 

 described as glabrous, but in both specimens they are minutely pubescent. 



Panicum jiliculme Ashe, Journ. Elisha Mitchell Soc. 15: 59. 1898, not Hack. 1895. 

 "Dry soil, middle North Carolina to Georgia in the Piedmont plateau region. * * * 

 North Carolina: Ashe; Chapel Hill, 1898. Georgia: Small; Stone Mt., Aug. 1895." 

 The type could not be found in Ashe's herbarium. . In the National Herbarium is a 

 specimen from Stone Mountain, Georgia, collected by Ashe, which answers to the 

 description. The culms are erect, slender, 12 to 20 cm. high, with small panicles 

 about 2 cm. long. The culms are the early autumnal form with a few erect fascicles 

 of secondary branches. This specimen differs somewhat in aspect from the type of 

 P. meridionaie, but they are forms of the same species. 



f Panicum microphyllum Ashe, Journ. Elisha Mitchell Soc. 15: 61. 1898. "Col- 

 lected by the writer June, 1898, at Chapel Hill, N. C, in moist sunny woods." The 



