AUHOSriDE.K. 206 



of tlio culm two or tliroc in nuniber. 2-0 (soinotinies 10) cm. lon^% 

 involute, setiicoous, scabrid above. Panicle exserted. j)iir|>lislu 

 spikelike, secund. rays solitary or clustered, branch in*,' near tlie 

 base, 3-U) cm. or more loui;. Spikeli'ts on short pedicels, empty 

 <;lnmes narrow, linear, abruptly pointed when spread, scabrous on 

 the back, tirst ;)-5 mm. lonj;. second A-'.t mm. lon<;; floret linear, 

 scabrous on the keel, about as lonj; 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 ami formerly described under several ditTerent 

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

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

 taller it is long exserted.'' Dr. Thurber in 8. Wats. I?ot. Calif. 

 2:2S9 (1S80). In the above some use also was made of his de- 

 scription of this species. 



Colorado, Orciiff: ^fexico, Puhtier oO;?; West Texas, Wrif/fti 

 T-il ; Arizona, Lcnitixni IJST. 



'' The dilVerent forms of this species, of which the A. hrnmnidea 

 II. H. K. is oiu'. were all united by Trinius & Kuprecht uiuler their 

 A . disperm. (Jenl. Mnnro, in his catalogue of the grasses in the her- 

 barium of Linnanis, says that .1. Aiiien'rana L., from Jamaica, is 

 called ,1. di,'iperf<(t, but Liiuuvus' nanu' ought to take precedence. 

 (Jrisebach. in Flora of the Jiritish West Indies, unites A. Amer- 

 ica nit L., ,/. (lisjiersit Trin.. J. hroinoides, A. hinitulift, A. coiirctata 

 II. H. K., ami .1. nxjnitlu Trin. under A. sfrida Michx." 



Dr. Thurber 1. c. : also see Scribner in Hull. Torr. Club. 0:87 

 (1SS".»). I am unable with data now at hand to perfect u list of 

 synonyms that is reliable. 



Colorado, (hrutt; Mexico, Pnhiier 60',). 



New Mexico, ^fexioo to Calfornia. 



22. A. Havardii Vasey, Hull. Torr. Club, 13:27 (1880). 



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

 liigh. 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. 



