BUCKWHEAT FAMILY 



425 



Fig. 81. ERIOGONUM UMBELLATUM Torr. a, umbel, past anthesis, 

 x 1; b, flower, x 8. 



12 lines long, on 

 petioles ^4 to 1/2 as 

 long; umbels simple, 

 subtended by a whorl 

 of linear to obovate 

 bracts, its rays 3 

 to 9 (rarely reduced 

 to 1), 5 lines to l 1 /^ 

 inches (or 3) long, 

 these and the bracts 

 soft - pubescent ; in- 

 volucre 8-lobed, the 

 lobes reflexed, nearly 

 as long as the tur- 

 binate tube, the tube 

 and throat crowded 

 with the floccose- 

 woolly bractlets ; 

 flowers sulphur- yel- 

 low; calyx glabrous, 

 gradually narrowed 

 into the long stipe- 

 like base, 2 to 3, or 

 in age 3 to 4 lines 

 long ; filaments pilose 

 on lower half. 



Higher Sierra Nevada and Coast Ranges, 4000 to 9000 feet ; north to Wash- 

 ington and east to the Rocky Mts. 



Locs. Shasta River, Butler 968; Humbug Mt., Butler 215; near Mt. Shasta, Jepson; 

 King Creek, Lassen Co., Jepson 4115; Portola, K. Brandegee; Bear Valley, Nevada Co., 

 Jepson; Lake Merced, Yosemite Park, Jepson 3183; Glacier Pt., Jepson 5643; near Mt. 

 Whitney, Jepson 936; Farewell Gap, Jepson 997; Trinity Summit, Jepson 2119; South Yollo 

 Bolly, Jepson. 



Var. stellatum Jones. Rays simple and bearing a whorl of bracts at their 

 middle or usually forked and the secondary rays similarly bracteate. San 

 Bernardino Mts. ; Sierra Nevada ; Siskiyou Co. ; north to Washington. 



Var. bahiaeforme Jepson n. comb. Inflorescence freely and irregularly 

 branched. Tehachapi region. 



Var. monocephalum T. & G. Dwarf mountain form with the umbel re- 

 duced to a single ray, that is, the peduncle naked or bracteate and bearing 

 a solitary involucre. Range of the species but far less common. Snow Mt., 

 K. Brandegee; South Yollo Bolly, Jepson. 



Refs. ERIOGONUM UMBELLATUM Torr. Ann. N. Y. Lye. Nat. Hist. 2: 241 (1828), type loc. 

 Rocky Mts.; Benth. Trans. Linn. Soe. 17: 410, t. 18, fig. 2 (1837); Sitgreaves Exped. pi. 12 

 (1853). E. speciosum Drew, Bull. Torr. Club, 16: 152 (1889), type loc. S. Fork Trinity 

 River, Hy-am-pum Valley, Chesnut $ Drew. E. dumosum Greene, Pitt. 3: 199 (1897), type 

 loc. American Valley, Plumas Co., S. M. Austin, said to be a shrub 5 or 6 feet high. E. 

 trichotomum Small, Bull. Torr. Club, 25: 43 (1898), type loc. Mt. Hamilton, Greene. E. 

 reclinatum Greene, Pitt. 5: 67 (1902), Sierra Nevada and adjacent Nev. (the peduncles 

 ascending). E. modocense Greene, 1. c. 68, type loc. Davis Creek, Modoc Co. E. smallianum 

 Heller, Bull. S. Cal. Acad. 2: 68 (1903), type loc. Mt. Sanhedrin, Heller 5996. Var. STELLA- 

 TUM Jones, Contrib. 11: 5 (1903). E. stellatum Benth. Trans. Linn. Soc. 17: 409 (1837), 

 type loc. interior of N. W. America, Douglas. E. croceum Small, Bull. Torr. Club. 25: 43 

 (1898), based on Idaho and Oregon spms. Var. BAHIAEFOKME Jepson. E. stellatum var. 

 bahiaeforme Wats. Bot. Cal. 2: 20 (1880). E. ovatum Greene, Pitt. 5: 69 (1902), type loc. 

 Silver Lake, Lassen Co., Baker $ Nutting. 

 160 (1870), type loc. western U. S. 



Var. MONOCEPHALUM T. & G. Proc. Am. Acad. 8: 



