PANICS^. 137 



So far as observed this seems to a good species. 

 Southern Texas. 



59. P. microcarpon Muhl. (iram. Ill (1817). 



An erect stout perennial; culm smooth, sometimes hairy at 

 the nodes, perhaps sparingly branched, 30-90 cm. high. Sheaths 

 as long as the internodes ; blades oblong-lanceolate from a narrowed 

 cordate base, smooth except the rough margins and ciliate base, 

 9-13-nerved, 10-18 cm. long, 2-3 cm. wide, usually a tuft of thick 

 ovate leaves near the ground, the apex much the shape of the leaves 

 of P. dandestinum. Panicle much exserted on a slender peduncle, 

 oblong or oval, 8-18 cm. long. Spikelets often purple, smooth or 

 nearly so, very numerous on very slender pedicels, obovoid or oval, 

 1.4 mm. long; first glume less than one-third as long as the spike- 

 let; second and floral glume of the neuter floret similar, 7-nerved, 

 the palea for the latter very small, hyaline, the fertile floret smooth, 

 the shape of a hemisphere slightly compressed. 



Specimens from the U, S. Dept. Agricul., no locality; Dis- 

 trict of Columbia, McCarthy. 



Wet ground. Massachusetts to Michigan and Texas. 



Var. sphaerocarpon (Ell.). P. splmrocarpo7i Ell. Bot. S. C. & 

 Ga. 1 : 125 (1817). Plant shorter, more slender; blades 6 cm. long, 

 8 mm. wide; sheaths shorter than the internodes. which are often 

 pubescent; j^anicle 5-7 cm. long; spikelets smooth or shortly j)ubes- 

 cent. 



District of Columbia, U. S. Dept. Agricul. from Dr. Vasey. 



Same range as the species. 



60. P. Chapmani Vasey, Bull. Torr. Club, 11:61 (1884). P. 

 tenuiculmtim Chapm. Fl. S. States. 572 (1860), not Meyer. 



Culms tufted, erect, slender, mostly simple. Sheaths ciliate on 

 the margins; ligule a ciliate ring; blades of sterile shoots firm, 

 mostly involute, usually smooth below, scabrous above, 20-30 cm. 

 long, 2-4 mm. wide, those of the culms shorter or about the length 

 of the internodes. Panicle slender, simjale, racemose, 15-30 cm. 

 long, composed of 8-10 appressed, sessile spikes, which are distant 

 below and approximate above, 1-3 cm. long; rachis triquetrous, 

 scabrous, flexuose, terminated by a short bristle. Spikelets oval. 



