122 SYNOPSIS OF THE FLORA OF COLORADO. 



More woolly ; leaves oblong or linear-oblong, margins more or less rev- 

 olute; cyme many-flowered, decompound, effuse-paniculate ; rays usually 

 longer 5 flowers white. Common on the plains and foot-hills. Denver, 

 Dr. Smith. Colorado Springs, Porter. Canon City, Brandegse. Canby. 

 Plains of the Platte, Coulter. 



ERIOGONUM BREVICAULE, Nutt. T. & G.j I c., p. 172. Caespitose ; 

 shrubby, the woody leafy- branches very short or depressed, bearing a 

 naked elongated herbaceous scape-like peduncle; leaves l'-2i' long and 

 l"-5" broad, linear, oblong-linear or narrowly spatulate-oblauceolate, at- 

 tenuate into a slender petiole, white-woolly on both sides or becoming 

 glabrous above, the margins at length mostly revolute; scapes rigid, 

 S'-IO' high, the cyme repeatedly umbeled or trichofcomous, calyculately 

 bracted at the nodes; peduncles and the 5-toothed oblong or cyathiform- 

 campanulate involucres (lJ"-2" long) glabrous or some glabrate; calyx 

 glabrous within, white or rose-color or sometimes bright yellow, the seg- 

 ments obovate-oblong and nearly equal. "From the head-waters of the 

 Platte to New Mexico." 



ERIOGONUM ANNUUM, Nutt. T. & G., 1. c., p. 173. Covered with a 

 close white wool ; stems tall, l-3 high, strict, leafy below ; leaves ob- 

 long, attenuated at the base, numerous, short-petioled ; cymes decom- 

 pound; flowers numerous; involucres snowy-woolly, glabrous within, 

 teeth 5, short ; calyx white, furnished at base with long, delicate, arach- 

 noid wool, segments unequal, outer ones much larger, broadly obovate, 

 inner ones oblong; bracteoles slightly plumose. Plains around Denver, 

 Dr. Smith. Around Colorado Springs, Porter. Canby. Hall (fe Harbour, 

 501. 



ERIOGONUM CERNUUM, Nutt. T. & G., 1. c., p. 182. Annual, slender, 

 4'-15' high ; leaves radical or sometimes cauline, round or obovate, some- 

 what loiig-petioled, floccose-woolly ; panicle glabrous, widely spreading, 

 decompound, usually very -many -flowered ; pedicels soon deflexed 

 smooth, 2-3 times longer than the campanulate, glabrous, many-flowered 

 involucre; bractlets setaceous, short, subnaked; calyx white or pinkish, 

 glabrous G-cleft, turbinate and acute at base, the outer segments square, 

 emarginate or retuse, scarcely exceeding the oblong half-as-wide inner 

 ones. Involucres not over V long ; flowers scarcely as long and often 

 much shorter, and well marked by the top-shaped base. Hall & Har- 

 bour, 503 ; Canby. Upper Arkansas, Porter. Canon City, Brandegee. 



ERIOGONUM GORDONI, Benth. T. & G., 1. c., p. 185. Glabrous 

 throughout; leaves subcoriaceous, round; peduncles several- from the 

 root, short, repeatedly divided above into an ample, loose dichotomous 

 panicle, branches slender, pedicels subcapillary, 9"- 14" long, erect ; 

 flowers 2-3, white, very small ; involucre turbinate-campanulate, 5- 

 toothed ; outer segments of the very smooth calyx ovate, a little longer 

 than the oblong inner ones ; bractlets minutely glandulose. Canon 

 City, Brandegee. Plains about Pueblo, Greene. 



ERIOGONUM TENELLUM, Torr. T. & G., 1. c., p. 180. Csespitose from 

 a much branched woody caudex ; leaves crowded, ovate or rounded, 

 white-tomentose ; scape and spreading panicle smooth; bracts very 

 small; pedicels elongated, erect; involucres l%"-2^" long, rather many 

 flowered; flowers white, the segments retuse, unequal, the outer broad 

 obovate or rounded ; bractlets villous. "Colorado to New Mexico. 7 ' 



OXYRIA DIGYNA, Campd. Hall & Harbour, 4D4; Parry. Giay ? s 

 Peak, Dr. Smith. Mount Lincoln, at lo.Cl'O feet altitude, and -Horse Shoe 

 Mountain, at 11,000 feet, Coulter. 



RUMEX VENOSUS. Pursh. DO. Prodr. 14, p. 43. Stem branched, 1 



