AGROSTIDE.E. 205 



of the culm two or throe in minibcr, 2-G (sometimes 10) em. long, 

 involute, setaceous, scabrid above. Panicle exserted, purplish, 

 spikelike, secuud, rays solitary or clustered, branching near the 

 base, 3-10 cm. or more long. Spikelets on short pedicels, empty 

 glumes narrow, linear, abruptly pointed when spread, scabrous on 

 the back, first 3-5 mm. long, second 5-9 mm. long; floret linear, 

 scabrous on the keel, about as long as the second glume, with a 

 short hairy callus, central awn shorter to a little longer than its 

 glume, the lateral ones a little shorter, all scabrous; palea less than 

 1 mm. long. Grain 7 mm. long, about 0,5 mm. diam. 



Very variable and formerly described under several different 

 names. " The same tuft has culms from 3 inches to a foot high; 

 in the shorter ones the base of the panicle is included, but in the 

 taller it is long exserted.'' Dr. Thurber in S. Wats. Bot. Calif. 

 2:289 (1880). In the above some use also was made of his de- 

 scription of .this species. 



Colorado, Orcutt; Mexico, Palmer 503; West Texas, Wright 

 741; Arizona, Lemmon 387. 



" The different forms of this species, of which the A. dromoides 

 H. B. K. is one, were all united by Trinius & Ruprecht under their 

 A. dispersa. Genl. j\Iunro, in his catalogue of the grasses in the her- 

 barium of Linnteus, says that A. Americana L., from Jamaica, is 

 called A. disjjersa, but Liuna?us' name ought to take precedence. 

 Grisebach, in Flora of the British West Indies, unites A. Ainer- 

 icana L., A. dispersa Trin., A. hromoides, A, hunmlis, A. coarctaia 

 H. B. K., and A. eognafa Trin. under A. stricta Michx." 



Dr. Thurber 1. c. ; also see Scribner in Bull. Torr. Club, 9:87' 

 (1882). I am unable with data now at hand to perfect a list of 

 synonyms that is reliable. 



Colorado, Orcutt; Mexico, Pcdmer 503. 



New Mexico, Mexico to Calfornia. 



22. A. Havardii Vasey, Bull. Torr. Club, 13:27 (1886). 



A smooth slender grass, sparingly branching below, 20-40 cm. 

 high. Ligule very short with a ciliate fringe; blades erect, invo- 

 lute, setaceous, 8-15 cm. long. Panicle sometimes with its base 

 included by the upper sheath, open, 12-15 cm. long, rays slender. 



