.. 



Spkt ai below 



the empty gin. Holcus. 



Spkt not articulate below emyty gm. 

 i Awns dorsal. 



a Spkt sm, under i cm Ig. Descham'a. 



b Spkt i cm or HK <e !g. ena. 



2 Awns tenniii ,1, rising irom be, 



the lobes ur t< Danthonia. 



Genus DESCHAMPSIA Beauv. 



Ann or per grasses with flat or con- 

 volute Ivs and contracted or open pan- 

 icles: spkt 2-fld; both fl perfect, the 

 hairy rach extended beyond or rarely 

 terminated by a stam one: gm 4; the 2 

 outer empty, keeled, acute, membranous, 

 shining, persistent; flg gm similar in 

 texture, decid, bearing a dorsal awn. 

 toothed at apex: palea nar: sta 3: sty 

 distinct: grain oblg, free and enclosed 

 in gm. Hair-grass. 



D. EREVIPOLIA R Br, in Parry Voy 191. 

 B 2:298 as Aira caespitosa. 

 Beauv, Agros 91 t 18 f 3. Mohave. B 

 2:297 as Aira C. 



DBSCHAMPSIA CAESPITOSA Beauv. 

 DESCHAMPSIA CALYCINA Presl. 

 J & C Presl, Rel Haenk 1:251. Da 19. 

 Ab 39. B 2:298 as Aira danthouioides. 



Ann; cu slender, 1-6 dm hi; sheaths 

 smooth; Ivs few, 3-6 cm Ig, 1 mm wide 

 or less; panicle spreading, about l-3d 

 length of cu, bearing 1-5 sokt above 

 middle, the lowest of which are on 

 spreading pedicels; spkt 2-fld; empty 

 gm about 2 mm Ig, hairy below, shining 

 above, 5-nerved, emarginate with 4 min- 

 ute ciliate teeth; awn inserted below 

 middle, about 6 mm Ig, bent near middle 

 and twisted below. 



Bear: Panamint mts (Coville). 

 D. DANTHOUIOIDES Munro. Bth PI 

 Hartw 342. B 2:298 as Aira dant. 

 D. EZ.ONGATA Munro in Bth PI Hartw 

 342. B 2:298 as Aira el. 

 D. GRACII.I3 Vasey. A 1:347 fdr. 

 D. ZOIiCTFORMIS J & C Presl, Rel 

 Haenk 1:251. B 2:297 as Aira h. 



Genus AVEXA Linnaeus. 



L, Syst ed 1 (1735). 



AVEXA BARB ATA Brot. 



Fl Lusit 1:108. Dewey, Er 5: 29. 



Parish. Er 6:85. 



McClatchie. Erythea 2:78. Pasadena; 

 Catalina. 



A. CERNTJA Kunth, En PI 1:306. B 

 2:295. =Trisetum cernuum fide IK. 

 L. sp pi 80. Ab 39. Z 1:185. B 2:294. 

 P I:j3. Mig. Da 19. Greene, Cal ac b 

 2:415, Cruz. Eu. 

 AVKXA FATUA Linn. 

 Variety 6LABRESCENS Coss. Ab 40. 



Parish, Erythea 6:86. Nordhoff (Hubby), 

 ant"! San Bernardino, Cal. 



Florets clothe-d with hairs only on the 



440 



rachilla and at the base of the flowering 



gh^mes. In aspect not different from the 



type. 



A. MOLLIS Michx, Fl Am Bor 1:72 B 



2:296 as Trisetum subspicatum. 



A. SATIVA JM, sp pi 79. Ab 40. Cult 



Genus DAJffT&ONXA DC. 



Ann or per grasses with flat or con- 

 volute Ivs and contracted or open pan- 

 icles; spkt 3-many-fld. fl all perfect or 

 upper stam; rach pubescent extending 

 beyond fl: gm 5-many, 2 outer empty, 

 keeled, acute, sub-equal, persistent, com 

 extending beyond uppermost flg gm; flgr 

 gm rounded on back, 2-toothed, decid; 

 awn arising from between acute or 

 awned teeth, flat and twisted at base, 

 bent: palea hyaline, 2-keeled near mar- 

 gins, obtuse or 2-toothed: sta 3: sty dis- 

 tinct: grain free, enclosed in gm. 

 DANTHONIA CALIFORNICA Bol. 

 San Diego to Oregon. 



c- mm on 

 compound 



less. 



A. spkt 1 at each joint of rachis. 



1. spks very slender; spkt 1-2-fld. Lep- 

 turus. 



2. spks stout; spkt com 2- (or more) fld. 

 Spkt placed with 1 edge against 



rachis. Lolium. 



Spkt placed with 1 ride against rachis. 

 Agropyron. 



B. spkt 3 at each joint of rachis. Hor- 

 deum. 



C. spkt 2 at each joint of rachis. 



Axis of spk continuous; empty gm en- 

 tire. Elymus. 



Axis of spk articulate; empty gm 

 com 2-many-cleft. Sitanion. 



Genus LOLIUM Linnaeus. 



Ann or per, with simple erect cu, flat 

 Ivs and terminal spk: spkt several-fid, 

 1, sessile, alt in notches of com continu- 

 ous rachis. compressed, edge of spkt 

 turned toward rachis: gm rigid, 1st in 

 lateral and the 2 lower in terminal apkt 

 empty: flg gm rounded on back, 5-7-fld: 

 palea 2-keeled: sta 3: sty distinct, very 

 sh; stig 2: sd adherent to the palea. 

 Darnel or Ray-grass. 



X.. ABVENSE With Arr Brit pi ed 3,. 2: 

 168 (=rtemulentum fide IK). Schrad Fl 

 Germ 399; Sm Eng Fl 1:175 (= remotum 

 fide IK). Da. Er 1:102 LA Co. B 2:323 

 as temulentum. 



Xi. ITA.T.ICUM A Br. in Fl 17:259. B 2: 

 323, as cult var of perenne. =:muliflorum 

 fide IK. 



S.. MTTX-TirZiOaina Lam, Fl Fr 3:621. 

 B 2:323 as cult var of perenne. 

 IM. FEBENJwE L, sp pi 83. B 2:323. Ab 

 57. Z 1:186. Da 19, Er 1:102, 103 LA Co. 



English Raygrass. Per; cu 3-6 dm hi, 

 erect or com geniculate at base, smooth; 

 sheaths smooth; Ivs scabrid on edges and 

 upper side; spk 1-3 dm Ig. bearing 6-10 

 spkt; rachis smooth, channelled: spkt 

 6-8 mm Ig, smooth, shining. 7-11-fld; 

 empty gm strongly ribbed, much sh'er 



