20 POLYGONACEJ3. Eriogonum. 



turbinate tube : flowers yellow or yellowish, 2 or 3 lines long. Ann. Lye. K". Y. 

 ii. 241 & Sitgr. Rep. t. 12 ; Benth. 1. c. 11 Torr. & Gray, 1. c. 160. 



Var. monocephalum, Ton. & Gray, 1. c. A dwarf alpine or high-mountain 

 form, with the umbel reduced to a single ray, i. e. the naked or bracteate peduncle 

 bearing a solitary involucre: leaves small. E. Tohnieanum, Hook. El. Bor.-Am. 

 ii. 134; Benth. 1. c. 



A common species in the mountains of Northern California and Oregon, and eastward to the 

 Rocky Mountains, at 6,000 to 10,000 feet altitude. 



5. E. Torreyanum, Gray. Glabrous throughout excepting the involucre-lobes : 

 leaves obovate- to oblong-spatulate, an inch or two long, rather thick : peduncles 

 stout, naked or rarely with a single leaf in the middle, 6 to 10 inches high, bearing 

 a few-rayed umbel ; lateral rays leafy-bracted in the middle and often divided : 

 flowers large (3 or 4 lines long), yellow often tinged with purple : ovary glabrous. 

 Torr. & Gray, 1. c. 158. 



In the Sierra Nevada, from Silver Mountain northward, Torrey, Kellogg, Lemmon, etc. 



6. E. Btellatum, Benth. More or less tomentose, the stems rather more diffuse 

 and leafy : leaves ovate-spatulate to oblanceolate : peduncle naked, 6 to 12 inches 

 high, bearing an umbel of 2 to 4 mostly elongated rays which are usually and often 

 repeatedly divided in a cymose manner ; the nodes and lateral rays all leafy-bracted : 

 flowers as in E. umbellatum. Linn. Trans, xvii. 409 ; Hook. Fl. Bor.- Am. ii. 1 34, 

 t. 177. E. ellipticum, Nutt. PI. Gambel. in Journ. Acad. Philad. n. ser. i. 161. 

 E. polyanthum, Benth. in DC. Prodr. xiv. 12; Torr. & Gray, 1. c. 158. 



Var. bahiaeforme. Inflorescence much branched ; leaves mostly small and often 

 densely tomentose on both sides. E. polyanthum, var. bahiceforme, Torr. & Gray, 

 1. c. 159. 



In the mountains from Oregon to Southern California, chiefly in the Sierra Nevada, more rarely 

 in Arizona and S. Utah (Anderson, Palmer, Wheeler) ; the variety near Fort Tejon (Horn, Roth- 

 rock) and on Mt. San Carlos, Brewer. Distinguished from E. umbellatum principally by the 

 character of the inflorescence. 



E. HKRACLEOIDES, Nutt. ; Torr. & Gray, 1. c. 1 59. A similar species, densely tomentose with 

 the upper side of the narrowly oblanceolate leaves somewhat glabrate, and the peduncle nearly 

 always with a whorl of leaves in the middle, the margin of all the leaves usually somewhat revo- 

 lute or undulate; umbel about 6- (1-11-) rayed, sometimes simple, usually with some or all of 

 the rays once or rarely twice divided ; flowers often smaller. From the eastern part of Wash- 

 ington Territory to Nevada and Utah, and may reach Northeastern California. 



H- -H- -H- Perianth glabrous : peduncles stout and naked, from a thick and short 

 sparingly branched caudex : umbel usually compound : leaves large, broadly 

 ovate or oblong. 



7. E. compositum, Dougl. More or less white-tomentose : leaves very densely 

 tomentose beneath, greener above, oblong-ovate, cordate at base, acute or acutish, 

 1 to 3 inches long, on slender elongated petioles : peduncle very stout and fistulous, 

 erect, \ to \\ feet high, nearly glabrous : umbel of 6 to 10 more or less elongated 

 rays, each bearing a short several-rayed umbellet, subtended by whorls of linear- 

 oblanceolate leaflets : flowers dull white or rose-colored, 2 to 4 lines long. Benth. 

 1. c. 11; Torr. & Gray, 1. c. 159. 



From Washington Territory to Idaho and Northern California ; on volcanic rocks near Long 

 Valley, Mendocino County, Bolandcr. 



8. E. Lobbii, Torr. & Gray. Cespitose, the very thick caudex scarcely branched, 

 tomentose : leaves oval or rounded, \ to \\ inches long on rather stout petioles, 

 thick and densely tomentose or somewhat glabrate above : peduncles 3 to 8 inches 

 high, decumbent : umbel of a few (about 3) stout and usually very short rays, sub- 

 tended by 3 or 4 oblong or oblanceolate leaflets connate at base, the rays sometimes 

 divided : involucres very large, nearly half an inch long : flowers rose-colored, 2 or 



