46 POLYGONE^:. 



* * Annuals, leafy near the base only; panicles dichotomous; involucre* 



sessile, not virgately disposed. 



5. E. t run cat urn, Torr. & Gray. Slender, floccose-tomentose through- 

 out, 1 ft. high: leaves mostly rosulate near the base of the stem, some- 

 times a whorl subtending the lowest node; blade oblanceolate, 1 in. long, 

 attenuate to a slender petiole, the margin undulate: inflorescence very 

 lax, in a kind of umbel of 4 6 elongated and di- or trichotomous rays: 

 involucres few, oblong-turbinate, 2 lines long: fl. rose-color, 1 line. 

 Seemingly local, but plentiful at the eastern base of Mt. Diablo. 



6. E. Kortoni, Greene. Near E. truncatum, but smaller, more 

 branching, the stem branches and involucres glabrous, reddish in age: 

 leaves small and thick, broadly obovate or somewhat obcordate, cuneately 

 but abruptly narrowed to a long slender petiole, glabrous above, white- 

 tomentose beneath: involucres terminal upon the dichotomous branches 

 and sessile in the forks, solitary, turbinate, \% lines long, the 57 

 angles conspicuous, teeth short and blunt: fl. very numerous, rose-color, 

 % line long: sepals equal, obovate, nearly truncate. Marin Co. 



* * * Annuals; the. diffusely di-or trichotomous panicle leafy at the nodes; 



involucres pedicellate. 



7. E. angnlosnm, Benth. Grayish-tomentose, 618 in. high, loosely 

 and widely branching from near the base, the branches 4 6 angled: low- 

 est leaves ovate or rounded, cuneate or somewhat cordate at base, obtuse, 

 often undulate, J^ 1 in. long, on rather short petioles; upper oblong or 

 lanceolate, subsessile: pedicels of the involucres ^ 1*4 in. long, fili- 

 form: involucre hemispherical, 1 2 lines broad, many-flowered, smooth 

 or glandular: bractlets mostly dilated and rather firm: fl. rose-color, 

 purplish, or even greenish- white, ^ line long, not quite glabrous; outer 

 sepals ovate, concave, the inner lanceolate, plane, somewhat longer. 

 Plains of the interior of Solano Co. 



* * * * Involucres sessile, scattered up and down the virgate branches. 



H Annuals; leaves mostly basal and rosulate. 

 M- Involucres tubular, 2 lines long. 



8. E. virgatum, Benth. Usually white-tomentose throughout: leaves 

 oblong, 1 in. long on slender petioles: peduncle simple, or with only a 

 few erect virgate branches, 1 2> ft. high, the involucres remote, the 5 

 teeth very short: perianth 1 line long, buff or yellow; outer sepals 

 broadly obovate, cuneately narrowed at base, the inner about as long, 

 spatulate-oblong: achene with a minutely puberulent rather slender beak. 

 Banks of Putah Creek, Solano Co. 



9. E. < las van the mu m, Torr. & Gray. Usually hoary-tomentose, 

 sometimes nearly glabrate: leaves oval or rounded, 510 lines long, 



