427 



spreading, branches 25-35 mm Ig, mostly 

 single, sessile; spkt 2-3 mm Ig, sh-pedi- 

 cellate; empty gm nearly equal, one- 

 fourth to one-fifth as Ig as flg gm, mostly 

 obtuse or eroded, hyaline; flg gm slender, 

 tapering, scabrous thruout, terminated 

 by a slender awn 25-35 mm Ig; palea 

 about = flg gm. 



Ab 32. "Com on dry ridges and ex- 

 posed places in the chaparrel bejt. 

 Monica, Gabriel and Santa Ana mts, 

 south to SD." 



Calmalli; Rosalia (Orcutt). 



S D (Or 496); S Bar; Baja (Or 1435). 

 MUHLENBERGIA DUMOSA Scribn. 



Southern California; Arizona; Mexico. 



Cu suffrutescent, 3-6 hi, smooth from 

 a thick woody rhizome, very much 

 branched: Ivs filiform, 2' Ig, very num; 



Eanicules num on the branches, oblg- 

 inceolate, about 1' Ig, loosely fld, inter- 

 mingled with the Ivs; spkt about 1%" 

 Ig; empty gm nearly equal, about %" Ig; 

 fig gm nar, terete, prominently 3-nerved, 

 pubescent below, tipped with an awn 2" 

 Ig; palet rather Ig'er than gm. 

 MUH.LENBERGIA GRACILJS Trin. 



Trin unif 193. Br Zoe 1:115 (Catalina) 

 rrM. debilis Trin (M. microsperma Trin) 

 fide Parish, Z 5:112. 



Mont.; Colorado; Arizona; California. 



Per; cu 1-2 hi, slender, the nodes 

 crowded at base, scabrous, covered at 

 base with dry, open sheaths; Ivs convo- 

 lute, rigid, 4-6' Ig; panicle 3-6' Ig; fiex- 

 uous, linear, nar; branches single or in 

 2's below, 1-2' Ig, flg at base; pedicels 

 scabrous, very sh; spkt 1^-2" Ig; empty 

 gm unequal, the lower about % as Ig as 

 flg gm, 3-nerved, acute or erose; upper 

 gm l-3d sh'er than flg gm, 3-nerved, 

 acute or 3-toothed, with teeth sh-awned; 

 flg gm 3-nerved, pubescent or scabrous 

 on back, ciliate on margins; awn 4-8" Ig; 

 palet its gm. Tex; NM; British Am. 

 MUHLEOSTBERGIA MEXICANA Trin. 

 Parry Wyo 16. 



Cu ascending, much branched, 2-3 hi; 

 panicles lateral and terminal, oft in- 

 cluded at base, contracted, branches 

 densely spk-clustered, or linear-con- 

 tracted, or loose and open, 2-6' Ig; empty 

 gm slightly unequal, lanceolate, Ig acum- 

 inate, about length of very acute fig gm, 

 latter about 1^4" Ig, sparsely pubescent 

 below. New England; Colo; Minn. 



McClatchie, Erythea 2:78. Gabriel mts. 

 MUHLENBERGIA PARISHII Vasey. 

 Vasey, Torr cl b 13:53 (1886). 

 = Muhlenbergia Californica Abrams. 



San Bernardino, Cal. (Parish). 

 MUHDENBERGIA PUNGENS Thurb. 

 Thurb, Phil ac pr 1863, 78. 

 Br, Fl Colo 230. 

 B 2:277. 



Somewhat resembling M. gracilis, but 

 the very pale g foliage hard and rigid, 

 each If terminated by a hardened point: 

 cu 1-1 ^ hi: panicle very open, its soli- 

 tary rays fasciculately branched just 

 above base into Ig 1-fld divisions: spkt, 

 including the awn, 2%" Ig: gm % as Ig 

 as floret, pointed by a distinct bristle: 

 floret with a very minute rudiment 

 (sometimes developed into an inperfect 

 floret) ; lower palet acute, awn 1" Ig or 

 less; upper palet with 2 setose teeth, 



428 



which nearly awn give appearance of 

 an undeveloped Aristida. 



Croft, Cal ac pr 3:205, "Black grama. 

 Grama China, regarded in Ar as most 

 valuable forage." 



Ft. Yuma, Cal. Utah; Nebraska, 

 Genoa POL.YPOGAN Desf. 



Ann or rarely per grasses with decum- 

 bent or erect cu, flat Ivs and spk-like 

 panicles: spkt Ifld: gm 3; the outer 2 

 empty, each extended into an awn, the 

 3d sm'er, com hyaline, sh'awned from 

 below apex, subtending a palea and per- 

 fect fl: palea sh'er than gm: sta 1-3: 

 sty sh, distinct: grain free, enclosed in 

 gm and palea. 

 POLYPOGON LITTORALJS Smith. 



Per, 3-6 dm hi, ascending from rt- 

 stocks sh;eaths nearly equaling the in- 

 ternodes, the upper slightly inflated; 

 somewhat lobed, 4-8 cm Ig; spkt 2-2.5 

 mm Ig; awns rr empty elliptic gm; flg 

 gm 1 mm Ig, truncate, hyaline, its awn 

 nearly twice as Ig; palea 2-toothed. 



McClatchie, Erythea 2:77. Pasadena. 

 FOLYPOGON MONSPELJENSIS Desf. 

 Ab 36. Da 18, Er 1:100 LA Co. Ha 60. 



Ann; cu erect or geniculate, 2-5 dm 

 hi; sheaths about nodes, upper 

 slightly inflated; Ivs flat, scabrous; 

 panicle spk-like, oval or cylindric, 3-8 

 cm ig. 1-2 cm broad, pale oft y'ish-g; 

 spkt num, nearly concealed by the 

 slender awns; empty gm pubescent or 

 cliiate, obtuse, elliptic: awns 4 mm Is; 

 fig gm 1 mm Ig; hyaline, truncate- jag- 

 ged; awn equaling or sh'er than gm 

 or 0;- palea 2-toothed. 



Chollas (Or 506); Arizona: X. M.; Mo- 

 have; Cruz; Rosa; Guadalupe. Widely 

 naturalized. 

 Genus GASTRIDITTM Beauv. 



Caespitose ann with flat Ivs and shin- 

 ing spk-like panicles: spkt 1-fld, herma- 

 phrodite: rach prolonged behind palea: 

 empty gm 2, equal, enlarged or saccate 

 at base, keeled above; fig gm much 

 sh'er than empty ones, hyaline, truncate 

 or obtusely 2-lobed, awnless or bearing 

 a slender awn just below apex: palea 

 nar, about length of gm: sta 3: sty sh, 

 distinct; stig plumose: grain subglo- 

 bose, free, included within the ventri- 

 cose base of gm. Nit-grass. 

 GASTRIDIUM AUSTRALE Beauv. 

 Vasey, CNH 3:78. B 2:275. Da Er I: 

 101, Monica. 



S D Co (Palmer); S F; Europe; Chili. 

 GASTRIDIUM LENDIGESUM Gaud. 



Cu more or less tufted, erect, 15-50 

 cm hi; sheaths sh'er than internodes. 

 smooth; Ivs 3-10 cm Ig, 2-4 mm wide, 

 acuminate, scabrous; panicle spk-like. 

 5-10 cm Ig. 1 cm wide, pale g and shin- 

 ing; spkt lanceolate, 5-6 mm Ig; empty 

 gms scabrous above; fig gm hairy, bear- 

 ing a slender awn below middle. Eu. 



Ab 37. "Com on dry ground in the 

 chaparral belt thruout our range." 



Vasey, CNH 3:78 as G. australe. 

 Genus CALAMAGROSTIS Adan*. 

 Genus PHLELM Linnaeus. 



Ann or per grasses with flat Ivs and 

 spk-like infl:spkt 1-fld: gm 3, the 2 outer 

 empty, membranous, compressed, keeled, 

 apex obliquely truncate, midnerve pro- 



