422 POACE^. 



A pretty reddish-topped grass found in the regions above 

 enumerated on dry mesas at the foot of hills, doubtless infrequent. 



13. B. Burkei Scribn. S. Y/ats. in Proc. Am. Acad. 18:179 

 (1883). Bull. Torr. Club, 11: 5 (1884). 



A tufted perennial, 10-30 cm. high. Culms very slender, erect 

 or geniculate. Blades glaucous, 10-40 cm. long, 1 mm. wide, often 

 with a few scattered hairs. Spikes 3-6, rather loose, nearly erect, 

 about 1.5 cm. long. Empty glumes smooth, ovate, nearly equal, 

 first about 3 mm. long, second longer, both usually very short- 

 awned just below the bifid tip; floral glume broad, hairy, over 1 mm. 

 long, bearing 3 nearly equal- winged seta?, about 4 mm. long; 2)alea 

 oval, with no projecting setag; rachilla slender, smooth, 0.7 mm. 

 long, bearing 3 equal setge 5 mm. long, widening below. 



Texas, Mrs. Anna B. Nichols, communicated to Professor 

 Scribner by Isaac Burk of Philadelphia, for whom the species is 

 named. 



Sandy plains of Upper Concho, western Texas, Reverchon 1361, 

 Curtiss 3440* ; distribution of North American Plants, Berlandier 

 167, 1427; U. S. Dept. Agrwul. 510; Mexico, Pringle 1974. 



14. B. curtipendula (Michx.) Torr. Emory's Kep. 153 (1848). 

 CJiloris mrtipendida Michx. Fl. Bor. Am. 1 : 59 (1803). Bouteloua 

 racemosa Lag. Var. Cienc. 3: Part 4, 141 (1805). Dinebra curti- 

 vendula DC. Cat. Hort. Monsp. 105 (1813). Eutriana cicrtipen- 

 dula Trim Fund. Agrost. 161 (1820). 



A tufted perennial, 30-100 cm. high, from short rootstocks. 

 Lower leaves from the taller culms sometimes 40 cm. long, 4 mm. 

 wide, the upper usually 5-10 cm. long; sheaths and ligule often 

 hairy. Spikes 30-60, about 1 cm. long, on short bent pedicels on 

 one side of an axis 15-30 cm. long. Spikelets purple, brown, or 

 green, 4-10 in a spike, 5-8 mm. long, the lowest the shortest; 

 empty glumes 1-nerved, first lanceolate, 2.5-4 mm. long, with an 

 awn 1 mm. long or less, second glume ovate-lanceolate, 3.5-8 mm. 

 long, including a short awn; floral glume sparsely liairy, membran- 

 ous, ovate-lanceolate, 5-6 mm. long, mucronate, the lateral seta? a 

 little shorter; palea as long and as wide as its glume, 2-toothed; 

 rachilla 0.5 mm. long, bearing a broad divided empty glume 2 mm. 



