419 



or rarely 0: palea 2-nerved: sta 3: sty 



distinct: grain free, tightly enclosed in 



gm. Triple-awned grass. 



ARISTIDA AMERICANA L t, 



L f PI Jam Pugill 7; Amsen ac 5:393 



(1769); syst ed x, 879. Bouteloua 



bromides et juncifolia flde IK. Calmalli! 



Colorado Desert (Or 2075). 

 Variety BBOMOIDES Scribn & Merrill. 

 Ab 28. Chollas (Or 1071). CD! Baja! 



Cu slender, branching below and 

 tufted, 8-35 cm hi; sheaths sh'er than 

 internodes; ligule reduced to a sh 

 fringe; sterile shoots few, Ivs 2-8 cm 

 Ig, involute, setaceous, scabrid above: 

 panicle exserted, spk-like, secund, p'lish, 

 2-5 cm Ig; spkt on sh pedicels; empty 

 gm nar, linear, abruptly pointed, sca- 

 brous on back, 1st 3-5 mm Ig, 2d 5-9 

 mm Ig; fld gm scabrous on keel, about 

 as Ig as the 2d gm; central awn sh'er. 

 all scabrous; palea less than 1 mm Ig. 

 A. ABIZONIUA Vasey, Torr cl b 13:27. 

 A 1:43 fdr. 



ARISTIDA BROMOIDES HBK. 

 HBK nov Gen st sp 1:_'2. Ecuador. B 

 2:289. Da 19. Vasey, CNH 3:45. =A. 

 Americana var bromoides. 



Chollas (Or 1071); CD (Or 2245); Baja 

 1488). 

 (Or 1436). 



ARISTIDA CALIFORNICA Thurber. 

 Thurber, B 2:289. Br 2:212, El Llano 

 de Santana, Baja. Calmalli! 



"Cu 5-10' hi, very densely tufted, 

 geniculate below and branched above, 

 pubescent, especially at the nodes: Ivs 

 involute, pubescent above, scabrous be- 

 low, the radical from 1-1%' Ig, those 

 of the cu sh'er, the upermost minute 

 or reduced to a mere sheath; ligule a 

 fringe of hairs; sheaths sh'er than in- 

 ternodes, loose, striate, pubescent or 

 hirsute: panicle 1 or 2' Ig. racemose, 

 sessile, the other sh-pedicelled), the up- 

 few fld, the lower spkt in pairs (1 

 per solitary: gm scabrous on keel, lac- 

 erate-fringed at apex, com p with w 

 margins, the lower 4, the upper 6" Ig: 

 floret sh'er than the lower gm, with a 

 conspicuous w-hairy callus l-3d its 

 length; lower palet minutely scabrous, 

 especially above, pale g'ish and marked 

 with p'ish-bk blotches, the upper palet 

 about 14 as Ig; awns about equal, very 

 slender, minutely scabrous. l 1 '2-2' Ig. 

 twisted below into a slender" stipe 

 (5-8" Ig), which is articulated with the 

 upper palet and decid at maturity." 

 B 2:289. 



C D (Schott): Ft. Mohave (Cooper). 

 Variety FUGITIVA Vasey. 



"Differs from the type chiefly in the 

 lower and more condensed habit, and in 

 the longer empty gm. Late in the sea- 

 son it is loosened from the sand and 

 blown about by the wind. CD (C. R. 

 Orcutt)." Vasey. CNH 3:49. 

 Variety MAJOR Vasey. 

 Br 2:212, Magdalena Island, Baja. 

 ARISTIDA DISPERSA Trin. 

 Trin & Rupr, Mem ac Petersb sr 6. 

 7:129 (1849). Vasey CNH 3:46. X. 

 Americana L. 



Ann? cu branching, of variable hight, 

 panicle 1-6' Ig contracted, com p'ish, 

 lower branches mostly in 2's or 3's, un 



420 



equal (%-!') fi& nearly to base: gm 

 unequal or nearly equal, lower 3-4", 

 upper 4-5" Ig: fig gm 3": awns nearly 

 equal, 5-8" Ig, spreading. Tex to Cal. 

 A. FASCICTTLATA Torr, Ann Lye N Y 

 1:154 (1824). =A. Americana L, Canada. 

 ARISTIDA DIVARICATA H-B. 

 A. DXVABICATA HBK ex willd Enum 

 99. Mex. McClatchie, Er 2:78, Alta- 

 dena, Cal. 



Eaja mts (Or 1111); S Ber; Arizona. 

 A. OXICUTTXAXTA Vasey, Torr cl b 

 13:25. Parish, Z 5:111 not "So Cal." 

 Beal, Grass N Am 2:210, So Cal. Vasey, 

 CNH 3:48, So Cal, Ar. A 1:44 fdr. 



Type locality: Hansons, Baja mts not 

 far south of US boundary, 6000 alt. 

 ARISTIDA PURPUREA Nutt. 

 Nutt, Am Phil sc tr 5:145 (1837). 

 G Man ed 6, 640. Vasey CNH 3:46. 



Panicle rather erect, slender; empty 

 gm aristulate, bifid at apex; awns cap- 

 illary, very Ig; Ivs sh scabrous; per, 

 Ivs nar, sh and scabrous, ligule pilose; 

 cu about 1 hi, panicle many-fid, a little 

 spreading, branches capillary, fls com 

 in pairs, bluish-p; one of the gm nearly 

 twice the length of other, longer gm 

 exceeding fig gm; awns equal, capillary, 

 nearly 3 times the length of the fig gm 

 and scabrous, fig gm minutely stipitate. 



Baja (Or 1145); Arizona (Or 2515, 2532). 

 Variety AEQTTEBAMEA Merrill. Ab 29 

 Based on variety Californica Vasey. 



Rather stout, tufted, glab, 3-6 dm hi; 

 cu simple; sheaths Ig'er than inter- 

 nodes, pilose at throat: Ivs involute, 

 lower num 3-10 cm Ig, 1-2 mm wide, 

 those of cu about 3, com 3-4 cm Ig; 

 panicle p'ish, the branches capilary, 

 com erect or ascending, com many-fld, 

 3-5 at each node; spkt pale or p'ish; 2d 

 empty gm twice as Ig as the 1st, equal- 

 ling flg gm, both cleft at apex, mid- 

 nerve excurrent as a scabrous awn, 1-2 

 mm Ig; fig gm about 10 mm Ig, strong- 

 ly tuberculate-scabrous; awns equal, 5-7 

 cm Ig. Tex. Cal. 



Variety CALIFCBiriCA Vasey, CNH 

 3:47. =Var. acouiramea Merrill fide Ab 

 29. 

 Variety FBNDLERIANA Vasey, U S Na 



Based on A. Fendleriana Steud. 



"Per. cu tufted. 8-12' hi, very slender 

 and erect, branching near base; radical 

 Ivs abundant, nearly capillary, involute, 

 3-4' Ig. those of cu about 3, 1 or 2' Ig; 

 panicle 3-4' Ig, thin; branches erect or 

 becoming spreading, few-fid, mostly in 

 2's below, with sh capillary pedicels; 

 empty gm variable, 4-6, 4-8, or 5-10!' re- 

 spectively; awns nearly equal, capillary 

 Ig." Vasey, CNH 3:46. 



hb cont 3:46. 



Parish, Erythea 3:59. "Rose mine, alt. 

 6,000 ft., eastern slope of the San Bernar- 

 dino mts., Calif." 

 ARISTIDA SCABRA Kth. 

 Kunth Rev Gram 1:62. Br 2:212, 

 Chapm. Fl supple 663. 



Baja (Br): Mexico. 



A. SCHIS DIANA Trin & Rupr, Mem ac 

 Peterrf. sr 6, 7:120 (1849). Br 2:212. 

 Vasey. CNH 3:47, Tex, NM, Mex. A 

 1:44.' 



Genus STIPA Linnaeus. 



