26 POLYGON ACE^E. Eriogonum. 



* Perianth glabrous, not attenuate at base, the outer lobes broad and somewhat 



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

 closely branched caudex, densely tomentose : involucres in a single head or 

 short cyme upon the naked peduncle : bracts very small, rigid and acute : 

 ovary scabrous above or the angles and filaments pilose. ( HETERO- 

 SEPALA, Torr. & Gray.) 



28. E. ovalifolium, JS"utt. Low and densely cespitose : leaves orbicular, 2 to 6 

 lines broad, obtuse, rarely oblong or acutish, mostly abruptly narrowed into tbe 

 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, 1| to 2| 

 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. Eiicyda 

 ovali/olia & purpurea, Nutt. PI. Gambel. 166. 



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

 Proc. Am. Acad. xii. 263. E. proliferum, Torr. & Gray, 1. c. 164. 



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

 Sierra Nevada, from California to the Rocky Mountains and northward to the British boundary ; 

 Suott Mountains, Siskiyou County (Greene), the variety, which is rather rare. 



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

 | to 1^ feet high : leaves oblong or oblanceolate, acute 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-spatulate. 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. NIVEUM, Dougl., 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 Territory to Oregon and Idaho. 



* * Perianth narrower but not stipe-like at base, the lobes similar and nearly 



equal: ovary and filaments glabrous, or nearly so. 



+- Perennials, with short-branched scarcely woody caudex and naked peduncles : 

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

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

 cymose panicle. ( CAPITA TA & CAPITELLATA, Torr. & Gray.) 



++ Dwarf and densely cespitose : head solitary. 



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

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

 revolute, 1 J 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. 



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



E. KINOII, 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 1^ to 2 lines long. On high 

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

 in the mountains of Utah and Colorado. 



++ *+ Peduncles 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 



