OP ARTS AND SCIENCES. 177 



BoDTELODA HiRSUTA, Lag. ( Chondrosium hirtum, HBK., 1. c, 

 17G, t. 59. G.faneum^ Torr. in Emory's Rep, 153, t. 12.) At San 

 Luis Potosi (1018 Schaffner) ; 943 Parry & Palmer. The typical 

 form, as shown by spikelets in Herb. Gray from Lagasca's original 

 specimens, differing in the less attenuate or sometimes mucronate teeth 

 of the flowering glume from the more common form northward, 

 which can hardly be considered as distinct. The rhachis of the spike 

 is usually conspicuously produced beyond the spikelets, as often occurs 

 also in the northern variety. 



BouTELODA OLiGOSTACHYA, Torr. At San Luis Potosi (1014 

 Schaffner) and near San Rafael (1015 Schaffner) ; 448 and 666 Bour- 

 geau ; 453 Bilimek ; 944 Parry & Palmer, a form with pale slender 

 spikes, the lower glumes nearly naked. This species includes Chon- 

 drosium Ascheiihornianum, Nees, and probably also 0. gracile, HBK., 

 though the last is figured and described as 1-spicate. 



BouTELOUA POLYSTACHYA, Torr. At Guadalupe, Texas (1356), 

 and in the San Rafael Mountains (1020" Schaffner) ; 946 Parry & 

 Palmer; 667 Bourgeau. 1017 Schaffner, from San Luis Potosi, is a 

 dwarf prostrate form, with very short awns. — Var. vestita, with the 

 lower glumes very villous. In the Sierra Madre, south of Saltillo 

 (1357), and near Morales, San Luis Potosi (1019 Schaffner) ; 943^ 

 Parry & Palmer. 



BouTELOUA (Chondrosium) trifida, Thurber, Gram. Mex. 

 Bound, ined. A densely cespitose perennial, glaucous, sparingly vil- 

 lous on the margins of the flat or subrevolute rather short leaves : 

 culms slender, erect, a foot high or less : spikes 3 to 5, slender, nearly 

 straight, glabrous, 6 to 9 lines long: lower glumes scarious, narrowly 

 lanceolate, nearly equal ; flowers glabrous, the flowering glume cleft 

 into o long nearly equal awns; sterile glume also 3-awned. — Some- 

 what resembling B. eriopoda, Torr., in habit. At Monclova, Coahuila 

 (1355)'; 945 Parry & Palmer. It is also 749, 2020 and 2022 Wright. 



BouTELOUA RACEMOSA, Lag. At San Luis Potosi (1061 Scliaff- 

 ner) ; 2755 and 451 Bourgeau. Spikes of 2 to 8 purplish spikelets, 

 the sterile flower reduced to a minute awn, or rarely more developed 

 in the uppermost spikelet, and with the awn exserted. Its farther 

 development into a triple awn, which frequently occurs in the common 

 form of the Northern States {B. curtipendula, Torr.), is evidently 

 insufficient for a separation of the species. 



BouTELOUA BROMOIDES, Lag. {Heterostegia juncifolia, HBK., 

 Nov. Gen. 1. 173, t. 54. Dinehra repens, HBK., 1. c, 172, t. 52. 

 Boutehna Humholdtiana, Giiseb. Probably also Dinehra hromoides, 



VOL. XVIII. (n. S. X.) 12 



