26 POLYGONACE.^E. Eriogonum. 



* Perianth rjlahrous, not attemiate at hose, the outer lobes Jjnvnl and somewhat 



cordate, the inner much narrower: cespitose perennials icith a short and 

 closely branched caiidex, densely tomentose : involucres in a sinyle head or 

 short cyme ujion the naked x)eduncle : bracts very small, rigid and acute : 

 ovai'y scabrous above or the anyles and filaments pjilose. — (§ Heteko- 

 SEPALA, Torn & Gray.) 



28. E. ovalifolium, Xutt. Low and densely cespitose : leaves orbicular, 2 to 6 

 lines Lroail, ohtusr, rarely oblong or acutisli, mostly abruptly narrowed into the 

 slender petiole : peduncles slender, 2 to 9 inches high : involucres 3 to 8, in a 

 single close head, 2 to 2|- lines long : flowers rose-colored, white, or yellow, I}, to 2i 

 lines long, the outer lobes oblong becoming suborbicular, the inner spatulate and 

 often retuse. — Journ. Acad. Philad. vii. 50, t. 8; Torr. & Gray, 1. c. 164. Eucycla 

 ovalifolia i<c purpurea, Kutt. PI. Gambel. IGG. 



Yar. proliferum, Watson. Involucres more or less diffusely cymose-umbellate. 

 — Proc. Aui. Acad. xii. 2G3. E. proliferum, Torr. & Gray, 1. c. 164. 



A very common and variable sjjecies in the mountains and on the foothills, mostly east of the 

 Sieira Nevada, from California to tlic Rocky ]\lountains and northward to the British boundary ; 

 Scott Mountains, Siskiyou County {Greene), the variety, which is rather rare. 



29. E. dichotomum, Uougl. Caudex more diffuse, with short leafy stems : 

 \ to 1^ feet high : leaves oblong or oblanceolate, aciute at each end, an inch or two 

 long, on slender petioles : peduncles rather stout, bearing a 3-rayed umbel, the 

 somewhat erect rays sparingly di- or trichotomous : lower bracts often foliaceous ; 

 the upper appressed : involucres usually solitary, tomentose, about 3 lines long, 

 strongly toothed : flowers white tinged with rose, 1^ to 2 lines long, the outer 

 lobes broadly elliptical, the inner linear-spatidate. — Benth. in DC. Prodr. xiv. 14. 

 E. album, Nutt. PI. Gambel. 164. E. Greenei, Gray, Proc. Am. Acad. xii. 83. 



Oregon ; rocky hills about Yreka {Greene). 



E. MVEUM, Doiigl., is a very similar species, distinguished by having most of the bracts more 

 or less foliaceous and spreading, and by the usually shorter and broader involucre with some or 

 all of the teeth produced and often recurved. — Washington Territoiy to Oregon and Idaho. 



* * Perianth narrotver but not stijie-like at base, the lobes similar and nearly 



equal : ovary and filaments glabrous, or nearly so. 



■i- Perennials, loith short-branched scarcely woody caudex and nalaed j^cdunrles : 

 bracts mostly short and rigid: involucres capitate or fascicled {or sometimes 

 solitary), the clusters mostly few, usually in a di- or trichotoinous long-jointed 

 cymose panicle. — ( §§ Capitata & Capitellata, Torr. & Gray.) 



++ Dwarf and densely cespitose : head solitary. 



30. E. Kennedy!, Porter. Densely white-tomentose, the numerous short 

 branches coniiiacted with the crowded old and new leaves : leaves narrowly oblong, 

 revolute, 1| to 3 lines long : peduncles very slender and wiry, glabrous, 2 to 4 

 inches high: involucres 2 to 10, somewhat tomentose, 1| lines long, strongly 

 nerved, with short teeth : flowers glabrous, white veined with red, 1| lines long. — 

 Watson, Proc, Am. Acad. xii. 263. 



Tn Kern County, California, W. L. Kennedy, 1876. 



E. KiNoir, Torr. & Gray, 1. c. 165 (excl. var.), has oblanceolate or spatulate leaves a half inch 

 long on slender petioles, more loosely woolly ; peduncles and involucres villous-tomentose, the 

 latter deeply toothed and somewhat scarious ; heads dense ; flowers H to 2 lines long. • — On high 

 mountains in Eastern Nevada, Watson. Several other sfiecies belonging to this group are found 

 in the mountains of Utah and Colorado. 



++ ++ Pcd uncles mostly tall and stout from a sparingly branched caudex. 



31. E. latifolium. Smith. Stout, tomentose throughout, the short branches of 

 the indurated caudex usually very leafy : leaves oblong to ovate, an inch or two 



