10(1 (IRAMINEAE 



1. A. bronioides 11. U.K. Annual; culms iinK-h-briUiclicd ;il tlic hiisc. 4 to 

 1'-' inrlu's liniii'. criM-t or often spreading or jirostrate; blades 1 to '_' iiu'lu's long, 

 narrow, usually involute: panicle uari'ow. rather dense. 2 1o :;! inches long, the 

 branches short, fascicled: irlunies unequal, smooth excei^t the keel oC the lirst. 

 1-nerved. the first 2^-, to :! lines long, acutisli. the second 'A\U to I lines long, 

 obtuse or slightly nnicronate: lemma 4 to ."> lint^s long, smooth exi'cpt upper 

 portion of keel, the c-allus w\\h a dense tul'l of short hairs, the aiiex scarcely 

 narrowed; awns iMpial. linally spi-cading, about o lines long, or the lateral 

 .sometimes shorter. 



Open grouinl. southern Caliroi-nia to New J\Texico an<l south through Mexico. 



Loe,6. — San Luis (.)ljisi)o, Joins '.V2-i'i; l''uii('ral Mts., Cniilli <)• FkiisIihi lT)!); Tlio Noodles. 

 Jones 3788; western ejge C'oloiado Desert, ll'iUlcr 1080; Culorsido Kiver, Kivevsido Co., Hall 

 5963; Coaeliella, Hall 5797; San Diogo, Brnndcqcc 832; Siinta Catalinii Island, liraiulcfin: 



Refs.— Aristiua bromoiues H. B. K. Nov. Gen. & Sp. 1: 122. 181(i; Tlun-li. in Wats. Rot. 

 Cal. 2: 289. 1S80. A. (imericnnd Ij. var. hromoidcs Serilm. & Morr. U. S. Dept. Afjr. Div. 

 Agrost. Cire. 32:5. 1901 (nndor a niisa]iprol>enslon as to the idiiility of A. amcrirdiiii li., 

 •whicli is Boiitrloua amrrirciiia (L.) Si-iilm. :uid md .1. iIi.^[>iimi 'I'riii. \- Unpr.) ; .Miranis l''l. 

 Los Ang. 28. 1904. 



2. A. oligantha .Mii-h\. .\iiinial; cnlnis erect, bc'inclu'd .-it base .-ind all the 

 nodes. 1 to '_' fei't high, often woolly at the \vy\ base; blades .'i line wide or 

 less, usually in\olutc. as nuich as (> inches long. s))aringly ]iilose at base, the 

 propliyllum often eonspienous at basi- of branches ;. iianicles narrow, loosely 

 few-llowered. bearing a fe«- scattered lai"ge appresscd sliorl pediceled spike- 

 lets; glumes about 1 ineh long, slightly \ine(pial. long-aw m-cl from a biliil .ipex, 

 the first strongly 7-ner\cil; lemma a little shoi-tci- than the irlimies, the gi'adu- 

 ally narrowed neck s<-ali<'i-nlous. the ivdlns r.itlier iiinnilel\ imbescent ; awns 

 about ei|ual. widely spreading, 2 to 3 incln's long. 



A native of tiie Southeastern States, probably introduced in ( 'ali foi'nia. ('hico, 

 ('(ipi hiiiil 'A-iSX : Mokelnnnie i-cjion. S.aci'.-inicnl o \'allcy. Fiiiclir: Mended Kails. 

 K('I.s< IJ. 



Eef.— Akistiua oi.ii;.\.\Tii.\ .Miidix. Kl. P.or. Ami. 1: II. 1S03. 



3. A. palmeri Vasey. Perennial: culms cespitose, erect, 1 to 2 feet high; 

 blailes involute. 2 to 4 inches long, a pilose ring at base extending around the 

 collai'; pani(de about ' ._. the entire length of the culm, loose; bi-anehcs mostly 

 in pairs, stihl\' as<'ending or spreading, spikchd -bearing tctwaril the (extremi- 

 ties; glumes acuminate, ncai'ly e(|nal. about o lines lonff. scabrous on tiie keel 

 and t he first also on the obscure latei'al pair of nerves ; lemma o 1o (i lines long, 

 smooth except the (b'lisely i)iU)escen1 callus, gi-adually narrowed above into a 

 twisted neck; awns uncipial, the central spreading, about 4 linos long, the 

 lateral erect, 1 to 2 lines long. 



San Diego Co, (Hanson's ]\It., Orcull)-. .\ri/.ona and noilliei-n .Mexico, 

 Refs, — Aristida pai.meri Vasey, Hull. Torr. Club 10: 42. 1883. A. Ummoni SiTilm. in 

 Britt. & Koarn. Trans. N. Y. Aoad. Sci, 14: 23, 1894, 



4. A, divaricata Ii\imb & lionpl. Perenni:d ; enlnis cespitose, erect. 1 to 2 

 feet high; blades involute, as much as 6 inches long; paiiiclo usually more 

 than VL' ^'"' length of tlii' entire plant; branches di.stant, mostly in fjairs, 

 divaricately spreading, sj)ikelet-l)earing toward the ends; gluim^s lunirly e(pial, 

 5 to ti lines long, 1-nerved, short-awned, the first scabrous on the keel; lemma 

 about ;") lini's long, scabrous toward the scarcely narrowed a|)ex; awns about 

 equal, b to 1(1 lines long, somewhat spreading. 



Southern (';ilifornia to Texas and south on tin- .Mi-\ie;iii iilateau. 



