■23 POLYGON ACE.*;. Eriogonum. 



36. E. fasciculatum, Bentli. 1. c. Slmibby, more or less tonientose and often 

 soniewluit villdus : leaves narrowly olilanceolate, aeuto, nearly sessile, nsually 

 strongly revolute, tonientose lieneatli, often glabrate above, 3 to I) lines long, luuch 

 fiiscieled : i)eiluneles short or elongated, bearing a short eyiuosely divided undjel 

 often much contracted or capitate : bracts more or less conspicuous : involucres 

 about 2 lines long, ])ubescent or glabrate : flowers rose-colored or whitish, glabrous 

 or often more or less villous. — Torr. ^ Oray, 1. c. E. rosmarinifolinm, Nutt. I'l. 

 Gambel. 164. E. polifolium, Benth. 1. c. E. ericce/oluim, Torr. <k Gray, 1. c. 170. 



From the coast of Soutliern California (Santa Barbaiu and southward) east to Arizona and 

 Soutliern Utah. Very variable in imbcscencf, etc., but the tonus scarcely merit tlic rank of 

 varieties. E. poUfolium is a eommon hoary form with less revoUite leaves aiul elongated i)9dun- 

 cles. E. erimjiilium was founded upon veiy reduced specimens with short blanches and snudi 

 almost sessile heads ; it oii ins in Aii/oiui and S. Uudi. 



^- H- ^- Perennials or anitnnls, leafy heJoio : leaves not fascicled : hracts small, 

 the hnver very rarely follaceous : involucres mostly solitary, in an oiien 

 and repeatedly di- or t'richotonious corymb-like cyme: 2'(^>'i(inth cjlahrous. — 

 (§ COHYMBOSA, IJenth.) 



++ Perennial, woody and much branched, leafy below. 



37. E. microthecum, Nutt. Low and dilfuse, rather slender, 3 to 12 inches 

 high, more or less white-tomentose : leaves oblanceolate to linear, usually narrow, 

 I to'l.\ inches long, acute, more or less strongly revolute, M'hitetomentose beneath, 

 becomnig glabrate above, shortly petioled : peiluncles short, bearing a short umbel 

 of 3 to 5° more or less (once to thrice or more) subdivided rays : involucres usually 

 small, § to 1| lines long, attenuate at base and especially the alar ones often pedun- 

 culate : flowers a half to a line long, from nearly white to deep rose-color or rarely 

 yellow. — Torr. <K: Cray, 1. c. 170. 



A very variable species, frecpient in the mountains of the tireat Basin and in tlie T^ocky Moun- 

 tains from Oregon and the eastern side of tlie Sierra Nevada to Nebraska and New Mexico. 

 Reduced alpine forms are found at 8,000 to 10,000 feet altitude, Mono and Souora Passes, and 

 Silver Mountain, Bohindcr, Brewer. The var. efusiim, Torr. k Gray (A', cfusuvi, Nutt.), with 

 more diffuse and repeatedly branched inflorescence is common in the Rocky Mountains but not 

 westward. 



38. E. corymbosum, Benth. Stouter and more rigid, usually densely tonien- 

 tose : leaves usually longer and broader, ovate- to oblong-oblanceolate, and less 

 revolute : umbel stiff, broadly cymose : involucres mostly sessile, a line or two 

 long : flowers 1 or 2 lines long. — DC. Prodr. xiv. 17 j Torr. & Gray, 1. c. E. mia-o- 

 thecnm, var. (1) Fendlerianum, Benth. 1. c. ; Torr. & Gray, 1. c. 



In dry valleys and on the foothills from the base of the Sierra Nevada eastward. Forms occur 

 apiiaieutly ((innecting this si)ecics with the last. 



■H- -H. Annual: leaves mostly rosulate at the base, a whorl rarely subtending the 



nodes. 



39. E. truncatum, Torr. & Gray. A foot high, floccose-wooUy throughout, 

 slender: leaves oblanceolate, an inch long, attenuate to a slen.ler petiole, les.s 

 tomentose above, the margin undulate : pe.luncle short, bearing a lealy-bracted 

 umbel of 4 to 6 elongated rays, which are loosely once or twice di- or trichotomous : 

 bracts very small : involucres few, tomentose, oblong turbuiate, 2 lines long : flow- 

 ers light rose-color, a line long. — Proc. Am. Acad. viii. 173. 



On dry IdUsides at Aiarsh's Ranch, east of I^Iount Diablo, Brcvcr. In flower, May 29. 



40. E. Mohavense, Watson. A foot high or less, very slender, glabrous above 

 the base ditt'usely biaiiclu'd : leaves rounded or ovate, tomentose, half an inch long 

 or less abruptly narrowed to the slender petiole, all radical : peduncle short, bearing 

 a naked uraberof 3 or more rays, repeatedly dichotomous with very slender joints : 



