24 POLYGONACE^. Eriogonum. 



++ ++ Pedicels erect or sometvhat sjjreadhiff : outer segments inuch broader above. 



21. E, Thurberi, Torrey. Very slender, G inches higli or less, the stem tomen- 

 tose below tlie panicle: leaves rounded-ovate, obtuse, 3 or 4 lines long: bracts com- 

 paratively large and thick, spreading : pedicels very slender, a half to an inch long : 

 involucres campanulate, nearly a line long, subviscidly puberulent : flowers rose- 

 colored or white, half a line, becoming a line long ; the outer segments "with a large 

 rounded terminal lobe, the inner small and lanceolate. — Bot. Mex. Bound. 176; 

 Torr. & Gray, 1. c. 183. 



Southern Califoiiiia, Los Angeles to San Bernardino {Thurher, Wallace, Parry) ; near Camp 

 Grant, Arizona, Palmer. The remaining species of this group, E. rotundifolium, Benth., is 

 rather stouter, more difFuse, and with larger leaves ; pedicels shorter and more rigid ; flowers 

 from less than a line becoming H lines long, the outer segments very broadly dilated above, the 

 inner narrowly oblong : New Mexico and Western Texas. 



■1— -I- -1— Perianth mostly minutely glandular-hispid or -picberulent, longer than 

 the small invohicre, the outer segments mostly ovate : pedicels lojig and fili- 

 form, rarely deflexed. 



++ Leaves floccose-tomentose, not villous or silky : pedicels all hi the forks or ter- 

 minal : stem not inflated. 



22. E. pusillum, Torr. & Gray. Very variable in size, 2 to 20 inches high, 

 becoming rather stout and diffusely much-branched : leaves rounded or obovate, 

 obtuse, 6 to 1 2 lines broad, usually less tomentose above : the greenish bracts and 

 involucres minutely glandular-hispid: pedicels smooth, 3 to 18 lines long or rarely 

 more, comparatively rather stout : involucres hemispherical-campanulate, a lialf to a 

 line long : flowers yellow or yellowish, often tinged with red, deeply parted, more 

 or less glandular-puberulent, becoming a line long, the outer segments oblong- 

 obovate, the inner oblong : akene short and compressed-globose. — Proc. Am. Acad, 

 viii. 184 ; Watson, Bot. King Exp. 308. 



A very peculiar species; of dry valleys, from Northwestern Nevada {JVatson, Lemmon) to 

 Arizona (Palmer) and San Bernardino County, California, Newberry, Parry. 



23. E. reniforme, Torrey. Low and slender, glabrous : leaves small, reniform 

 or cordate-orbicular and, Avith the petioles, densely white-tomentose both sides, not 

 at all hairy : bracts smooth, the margins fimbriate with loose hairs : pedicels half an 

 inch long or less : involucres smooth, turbinate-campanulate, nearly a line long : 

 flowers apparently rose-colored, half a line long, glabrous, segments ovate-oblong, the 

 inner a little smaller. — Fremont's Eep. 317 ; Benth. in DC. Prodr. xiv. 21 ; Torr. 

 & Gray, 1. c. 184, excluding Palmer's Arizona plant with smaller involucres. 



Collected by Fremont "on the Sacramento," and by Coo;;er at Fort Mohave: imperfectly 

 known. Specimens of E. suhreniforme have been referred to it. 



24. E. Thomasii, Torrey. Very slender, a span high or often much less, dif- 

 fuse, glabrous : leaves rounded and ovate, half an inch long or less, usually less 

 tomentose above: bracts minute, glabrous: pedicels filiform, 2 to 15 lines long: 

 involucres glabrous, turbinate-campanulate, \ to \ line long : flowers yellowish or 

 tinged with red, becoming two thirds of a line long, slightly hispid at base or gla- 

 brous, the outer segments at length often much dilated below, the inner linear- 

 oblong or spatulate. — Pacif. R Rep. iv. 364 ; Torr. & Gray, 1. c. 184. 



In the valley of the Colorado, from Fort Yuma to Fort Mohave and eastward to S. W. Colo- 

 rado {Brandcgee) ; eastern base of San Bernardino Mountains, Parry. 



++ ++ Leaves more or less villous-pid>escent, not tomentose : pedicels often scattered 

 and .spcnnd on the branchlets : stem often inflated. 



25. E. trichopodum, Torrey. Glabrous, difiuse, | to 1 fiot high, the stem 

 occasionally somewhat inflated ; branches very slender : leaves round-cordate to 



