HITCHCOCK AND CHASE NORTH AMEEICAN PANICUM. 



245 



Autumnal form spreading, branching from the middle and upper nodes, the 



branches rather crowded, the reduced 



involute-pointed blades exceeding the 

 ultimate panicles; blades of the winter 

 rosette as much as 7 cm. (rarely 12 

 cm.) long. 



DISTRIBUTION. 



Fig. 2G4. — Distribution of P. wilmingtonense. 



Sandy woods, North Carolina and 

 Alabama; rare. 



North Carolina: Wilmington, 

 Ashe in 1899, Hitchcock 316; 

 Jacksonville, Chase 3195. 

 Alabama: Auburn, Alabama Bio- 

 logical Survey, Earle & Baker 1530 in part, Hitchcock 1325; Gateswood, 

 Tracy 8429. 



146. Panicum tsugetorum Nash. 



Panicum tsugetorum Nash, Bull. Torrey Club 25: 86. 1898. "Type material 

 collected by the writer in the Hemlock Grove, New York Botanical Garden, on dry 

 soil, June 22, 1896, no. 287." The type, in Nash's herbarium, consists of a clump of 

 8 vernal culms 20 to 37 cm. high, decumbent at base and bearing scarcely mature pan- 

 icles. The culms are less stiff and the blades thinner than usual in this species, as 

 the plants grew in the shade. 



Panicum lanuginosum siccanum Hitchc. & Chase, Rhodora 8: 207. 1906. "Type 

 Chase 1602. Dry, hot sand of sandstone cliff. Starved Rock, 111." This specimen, 

 in the National Herbarium, is the early autumnal form, and represents an extremely 

 haiiy form of P. ts-^igetorum. The culms and sheaths are ascending-pilose and the 

 blades are sparsely long-pilose on the upper surface. 



description. 



Vernal plants usually pale bluish green; culms 30 to 50 cm. high, spreading or 

 ascending, the lower nodes often geniculate, densely appressed-pubescent with short, 

 crisp hairs, long hairs more or less copiously intermixed with these on the lower inter- 

 nodes or sometimes nearly to the summit; sheaths commonly not much shorter than 

 the internodes, pubescent like the culm but less densely so, ascending-ciliate on the 



margin; ligules 1 to 1.5 mm. long; blades thickish, 

 firm, with a thin white cartilaginous margin, ascend- 

 ing, 4 to 7 cm. long, 4 to 7 mm. wide, rounded at the 

 base, acuminate, glabrous or with a few long hairs 

 near the base on the upper surface, appressed- 

 puberulent beneath; panicles 3 to 7 cm. long, nearly 

 as wide, the axis and spreading, flexuous branches 

 appressed crisp puberulent; spikelets 1.8 to 1.9 mm. 

 long, 1 mm. wide, obovate-obtuse, rather turgid, 

 short-pubescent; first glume one-third to two-fifths 

 as long as the spikelet, acute; second glume and sterile lemma barely equaling the 

 fruit at maturity; fruit 1.5 mm. long, 1 mm. wide, broadly elliptic, obtuse. 



Autumnal form decumbent-spreading, branching fi-om the'lower and middle nodes 

 often before the maturity of the primary panicles, the branches ascending, the ulti- 

 mate branchlets appressed, the blades not greatly reduced nor crowded; winter 

 rosette appearing rather early, the blades often conspicuously long-pilose. 



Fig. 265.— p. tsugetorum. From 

 type specimen. 



