2(3 POLYGONACE.'E. Kriogonum. 



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



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

 closely branched caudeu; densel// tonientosc : involucres in (L,sin(jle head or 

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

 ovary scabrous above or the angles and Jilaments pilose. — (§ IIetkro- 

 SEi'ALA, Turr. A; iJmy.) 



28. E. ovalifolium, Nutt. Low and densely cespitose : leaves orhicnlar, 2 to 6 

 lines broad, olitiise, rarely oblong or acutish, mostly abruptly narrowed into the 

 slender petiole : i)eduncles slender, 2 to i) inches hi<;h : involucres '^ to H, in a 

 single close hiuid, 2 to 2^ lines long: llow(!rs rose-colored, white, or yellow, 1^ to 2A 

 lines long, the outer lobes oblong becoming suborbicular, the inner spatulatt; and 

 often retuso. — .lourn. Acad. Philad. vii. 50, t. 8; Torr. iK: CIray, 1. c. IGl. JCnci/cla 

 ovalifolia i\: pur/>iin<(, iSult. i'l. Clambel. IGG. 



Var. proliferum, AVatson. Involucres more or less difl'usely cyniose-umbellate. 

 — Proc. Am. Acad. xii. 203. E. jjroHftrum, Torr. & Gray, 1. c. 104. 



A very comnKJii uiul variable sjiecies in the niouiitains and on the foothills, mostly cast of the 

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

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



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

 i to 1.^ feet high : leaves oblong or oblanceolate, acute at each end, an inch or two 

 fong, on slender petioles : peduncles rather stout, bearing a Srayed umbel, the 

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

 the upper appresseil : involucres nsually solitary, tomentose, about 3 lines long, 

 strongly toothed : flowers white tingeil with rose, U to 2 lines long, the outer 

 lobes broadly ellijjtical, the inner linear-spatulate. — Beuth. in DC. Prodr. xiv. 14. 

 E. (dbum, Nutt. PI. Uambel. 164. E. G'retnei, Gray, Proc. Am. Acad. xii. 83. 



Oregon ; rocky hills about Yreka (Greene). 



K. NIVEIJM, Douf^l., is a very similar siiccies, distinguished by liaving most of the bracts more 

 or less foliaceous ami spreading, and by the usually shoitcr and bioadcr involucre with some or 

 all of the teeth produced and often recurved. —Washington 'I'erritory to Oicgon and Idaho. 



* * rcrianth narrower but not stipedike at base, the lobes similar and nearly 



etpual: ovary and Jilaments glabrous, or nearly so. 



+- Perennials, loith short-branched scarcely woody cajid ex and naJced peduncles : 

 bracts mostly short and rigid: involucres capit((te or fascicled (or sometimes 

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

 cymose panicle. — ( §§ (Jaimtata & Caimtei.lata, Turr. & Gray.) 

 ++ Dwarf and densely cespitose: head solitary. 



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

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

 revolute, U to 3 lines long: peduncles very slender and wiry, glabrou.s, 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. — 

 AVatson, Proc. Am. Acad. xii. 2G3. 



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



E. KiNr.ii, Torr. & Cray, 1. c. 165 (excl. var.), has oblanceolate or spatiilate leaves a half incli 

 long on slender ])Cti()les, more loosely woolly ; jwduncles and involucres villoustoinentose, the 

 latt'er deeply toothed and somewhat scarious ; heads dense ; flowers U to 2 lines long. — On high 

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

 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 



