30 POLYGONACE^E. Eriogonum. 



greener above : panicle twice or thrice divided, with 1 to 3 involucres on the short branches : 

 bracts short, the lower somewhat elongated : involucres glabrate, 1^ lines long, with acute tri- 

 angular teeth : flowers light rose-color, 1 lines long. In the Blue Mountains, Oregon ; collected 

 only by Douglas and Nevius. 



++ ++ Perennials, woody and leafy at base, tomentose or glabrate : panicle diffuse, 

 with short rigid branchlets : involucre short, the teeth rounded and more or 

 less membranous-margined. 



45. E. Heermanni, Dur. & Hilg. Shrubby at base, a foot high, yellowish, 

 soon glabrate above, divaricately dichotomous, the short rigid branchlets somewhat 

 spinescent : leaves scattered at the base, oblanceolate, half an inch long, on slender 

 petioles ; bracts very small, triangular : involucres few and distant, campanulate, 

 a line long, the teeth rounded and margined, glabrous : flowers 1 1- lines long, rose- 

 colored or yellowish, the outer lobes obovate, the inner narrower. Pacif. R. Rep. 

 v. 14, t. 17 ; Torr. & Gray, 1. c. 179. 



In dry valleys of California and Nevada ; on Pose Creek (Heermann) ; Washoe and Humboldt 

 Counties, Nevada ( Torrey, Lemmon) ; S. Nevada, Wheeler. 



46. E. Falmeri, Watson. More tomentose throughout, and usually taller, with 

 a short branching leafy base : leaves lanceolate or oblanceolate, acute, half an inch 

 long, on short petioles : stems somewhat flexuous, mostly alternately branched, the 

 short branchlets divaricate or deflexed, very short-jointed : bracts very small : invo- 

 lucres rather numerous, narrowly turbinate, a line long, nearly glabrous, the rounded 

 teeth pubescent : flowers a line long, white tinged with rose-color, the outer lobes 

 cuneate-obovate, the inner slightly narrower : akene somewhat pubescent. Proc. 

 Am. Acad. xii. 267. 



Collected only by Dr. E. Palmer at Julian and San Felipe, San Diego County, and also in 

 Southern Utah. 



H. -H- -H- Annuals : leaves rosulate at the base, but sometimes also occurring at the 

 nodes. Species mostly of difficult definition. 



= Tomentose throughout: branches virgate, sparingly divided: involucres nar- 

 row, 2 lines long. 



47. E. virgatum, Benth. Slender, a foot or two high or more : leaves oblan- 

 ceolate, an inch or two long, on slender petioles, the margin usually undulate : 

 branches elongated and ascending, strictly virgate or flexuose : bracts lanceolate, 

 shorter than the involucres, sometimes including one or more leaves : involucres 

 tomentose, 2 lines long : flowers a line long, rose-colored to white or yellow, gla- 

 brous. I)C. Prodr. xiv. 16 ; Torr. & Gray, 1. c. 177. E. roseum, Dur. & Hilg. in 

 Pacif. R. Rep. v. 14, t. 15 ; the exceptional more foliaceous and branching form. 



From Siskiyou County (Greene) to Los Angeles, in the Coast Ranges, and also in the Sierra 

 Nevada as high as the Yosemite Valley. As respects tomentum it appears to be variable, ranging 

 towards E. mmineum, from which it should be distinguished by the narrower leaves, larger invo- 

 lucres, and less diffuse habit. 



48. E. dasyanthemum, Torr. & Gray, 1. c. Less tall and more slender : 

 leaves rounded, half an inch broad or less, somewhat scattered upon the stem : 

 panicle more branched and rather diffuse : bracts very small : involucres scarcely 2 

 lines long, very narrow, flowers a line long or less, villous at least at base. 



Near Clear Lake (Bolander, Torrey); Borax Lake (Torrey) ; also near Virginia City, Bloomer. 



= = Glabrous or somewhat tomentose, slender and more diffusely branched: 

 involucres 1 to 1J lines long, narrow or turbinate: bracts very small. 



49. E. vimineum, Dougl. Rather diffuse, the branches often elongated, a half 

 to a foot high, usually more or less tomentose at least below the panicle : leaves 

 orbicular to broadly ovate, 3 to 10 lines broad, undulate, less tomentose above; the 



