POLYGONE.E. 145 



9. E. Lobbii, T. & G. Proc. Am. Acad. viii. 162 (1870). Hoary when 

 young, with a soft arachnoid tomentum : leaves oval or more rounded, 

 l^ — 11/2 in. long, on stoutish petioles, thick, glabrate above in age : 

 peduncles 3 — 6 in. long, weak and reclining : umbel simple, of few stout 

 and short rays, subtended by 3 or 4 oblong or oblanceolate leaflets con- 

 nate at base : involucres 3^ in. long, many-flowered : fi. dull white with 

 usually a tinge of rose, 2 — 3 lines long, the stipe-like base very short. — 

 Common on barren rocky or gravelly alpine summits north and south of 

 Donner Lake. Aug. — Oct. 



■i— -h- Involucres with slioii nearly or (iiiHe erect teeth; peduncles from 

 a diffuse woody base (except iu n. 'J). 



10. E. pyrolsfoliuin, Hook. Journ. Bot. v. 395. t. 10 (1853). Leaves 

 (from a short and thick, sparingly branched caudex) thick, glabrous, 

 round-obovate to oblong, i^ — % ^^- broad, abruptly narrowed to a short 

 petiole : peduncles glabrous, 2 — 3 in. high, bearing a simple 2-bracteate 

 umbel of 1 — 4 short-pedicellate involucres, these sinuate-toothed and 

 villous : fi. rose-colored, l}^ — 2 lines long, sparingly villous on the out- 

 side. — In volcanic ashes near the summit of Lassen's Peak, Lemmon; 

 also in similar places on Mt. Shasta. 



11. E. ursinum, Wats. Proc. Am. Acad. x. 347 (1875). Densely 

 tomentose, the peduncle and compound 6 — 12-rayed umbel somewhat 

 villous : leaves ovate, acute, 4—6 lines broad, cuneate or rounded at 

 base, exceeding the petiole, glabrate above : peduncles stout, 6 — 12 in. 

 high ; bracts elongated, oblanceolate or linear : involucres large and 

 turbinate, sharply toothed: fl. 1}^— 2J2 lines long, pale yellow: fila- 

 ments very villous. — Plumas Co., Mr. Leiuiiiou, Mrs. Atnes. Sept. 



12. E. incaiiuiii, T. & G. Proc. Am. Acad. viii. 161 (1870). Rather 

 densely cespitose : leaves t^blong-spatulate or oblanceolate, }4 — 1 in. 

 long, short-petioled, densely tomentose on both faces : peduncles 

 slender, 2 10 in. high ; umbel simple, of 5 — 8 slender rays subtended 

 by a few small linear bracts, the central involucre sessile or the whole 

 umbel reduced to a small head: involucres l^/g lines long, strongly toothed : 

 fl. of a rather greenish yellow, in age often tinged with red, 1 — 3 lines 

 long. — In the higher Sierra, from Mariposa Co. to near Donner Lake. 



13. E. marifoliuin, T. & G. 1. c. Slenderly but intricately branched 

 at base : leaves ovate or oblong, I4 — 1^ in. long, usually glabrate above : 

 peduncle 2 — 12 in. high ; umbel simple, of 5 — 8 usually short rays, the 

 bracts short and linear : involucre 1 line long : fl. brownish or yellowish, 

 1 — 21/2 lines long, the smaller staminate only. — In the higher Sierra, from 

 Mariposa Co. northward. A small and homely species. July — Sept. 



14. E. Kello^gii, Gray, Proc. Am. Acad. viii. 293 (1870). Stems and 

 sterile stolons slender and cespitose, forming a broad mat : leaves 



