* 

 Eriogonum. POLYGONACE^E. 21 



3 lines long, more shortly stipitate at base : akene smooth. Proc. Am. Acad. 

 viii. 162. 



Alpine or subalpine in the Sierra Nevada, from Silver Mountain (Brewer) to Siskiyou County, 

 Greene. 



4 Involucre with short teeth, erect or nearly so: peduncles naked (except 



in n. 13). 



H- Perianth villous : peduncles from a short and thick sparingly branched cau- 



dex : umbel simple. 



9. E. pyrolaefolium, Hook. Leaves thick, glabrous, round-obovate to oblong, 



3 to 9 lines broad, mostly abruptly attenuate into a short petiole, broad and villous 

 at base : peduncles smooth, 2 or 3 inches high, bearing a 2-bracteate umbel of 1 to 



4 very shortly pedicellate involucres, which are sinuately toothed and villous : 

 flowers rose-colored, H to 2 lines long, rather sparingly hairy. Kew Journ. Bot. 

 v. 395, t. 10; Torr. & Gray, 1. c. 162. 



Mount Shasta (Jeffrey) and Lassen's Peak, in volcanic ashes, Lemmon. A more tomentose 

 form with narrower and densely tomentose leaves (var. coryphccum, Torr. & Gray, 1. c.) was col- 

 lected by Lyall in the Cascade Mountains. 



E. FLAVUM, Nutt. Tomentose throughout, with oblanceolate long-petioled leaves, and rather 

 slender peduncles 3 to 8 inches high : umbel simple, of 3 to 9 rays an inch long or usually much 

 shorter, sometimes reduced to a head of (one to several) nearly sessile involucres : bracts 3 to 8, 

 oblanceolate : involucre large, repandly toothed often obscurely, becoming brown and somewhat 

 membranaceous : flowers yellow, very villous, 2 or 3 lines long. Torr. & Gray, 1. c. 156. 

 E. crassifoliurn, Benth. in Hook. Fl. Bor.-Am. ii. 134, t. 176. A common species, ranging 

 from Washington Territory and Oregon to the Saskatchewan and Western Arkansas, and may be 

 found in Northern California. 



H- -H- Perianth glabrous : peduncles from a diffusely branched woody base. 

 = Umbel compound, villous-tomentose : bracts conspicuous. 



10. E. ursinum, Watson. Densely tomentose, the peduncle and umbel some- 

 what villous : leaves ovate, acute, 4 to 6 lines broad, cordate or cuneate at base, 

 exceeding the petiole, greener above : peduncles stout, 6 to 1 2 inches high : umbel 

 6 12- rayed, with elongated oblanceolate or linear bracts : involucres large and tur- 

 binate, sharply toothed : flowers pale, 1J to 2| lines long : filaments very villous. 

 Proc. Am. Acad. x. 347. 



In the Northern Sierra Nevada ; Plumas County, apparently abundant, Lemmon, Mrs. M. E. 

 P. Aiiws. 



= = Umbel simple, tomentose, the central involucre sessile or all subcapitate : 



bracts small. 



11. E. incanum, Torr. & Gray. Somewhat cespitose and matted, tomentose: 

 leaves oblanceolate or oblong-spatulate, a half to an inch long, on short petioles : 

 peduncles slender, 2 to 8 inches high : umbel of 5 to 8 slender rays, subtended by 

 a few small linear bracts, the central involucre sessile, or the umbel reduced to 

 a small head: involucres small (1^ lines long), strongly toothed: flowers yellow, 

 often tinged with red, 1 to 3 lines long. Proc. Am. Acad. viii. 161. 



In the Sierra Nevada, Mariposa and Tuolumne counties, at 8,000 to 11,000 feet altitude. 



'12. E. marifolium, Torr. & Gray, 1. c. Very slender, tomentose, the base dif- 

 fusely branched : leaves ovate to oblong, 3 to 6 lines long, densely tomentose both 

 sides or at length glabrous above : peduncle 2 to 12 inches high : umbel of 5 to 8 

 reduced or sometimes much elongated rays, with short linear bracts : involucre a 

 line long : flowers yellow or yellowish, 1 to 2^ lines long, the smaller apparently 

 only staminate. 



In the Sierra Nevada, from Mariposa County to Mount Shasta, at 7,000 to 9,000 feet altitude ; 

 also near Pyramid Lake, Nevada, Lemmon. 



