424 POLYGONACEAE 



Mountain slopes and dry plateaus east of the Sierra Nevada. Nevada, Ore- 

 gon, east to the Kocky Mts. 



Locs. Lake City, Modoc Co., Bruce; White Mts., Purpus 5798. 



Eef. ERIOGONUM CAESPITOSUM Nutt. Jour. Acad. Phila. 7: 50, pi. 8, f. 2 (1834), type loe. 

 headwaters of the Columbia, Nuttall. 



51. E. douglasii Benth. Matted white- woolly dwarf similar to the pre- 

 ceding, the scape-like peduncles with a whorl of 5 or 6 oblanceolate bracts at 

 the middle; involucral lobes linear, longer than the tube, reflexed; calyx yel- 

 low, hairy at base and along the midrib of the segments, stipe-like at base, 2 

 to 3 lines long, its segments obovate, obtuse, the inner exceeding the outer in 

 age; lower half of filaments pilose; ovary hairy towards apex. 



Northern Sierra Nevada. Nevada to Washington. 



Locs. Dormer, Kellogg in 1870; Sierra Valley, Lemmon; Susanville, Brandegee. 



Refs. ERIOGONUM DOUGLASII Benth. in DC. Prodr. 14: 9 (1856), type loc. Blue Mts., Ore., 

 Gairdner, Douglas. E. caespitosum var. douglasii Jones, Contrib. 11: 7 (1903), the reduction 

 perhaps well taken. 



52. E. sphaerocephalum Dougl. Peduncles 3 to 6 inches high, bearing a 

 solitary involucre and with a whorl of leafy bracts at their middle, or the 

 whorl subtending a 2 to 4-rayed umbel, the rays also 'bearing a central whorl 

 of bracts ; base much-branched, with many short woody leafy branchlets ; 

 leaves oblong to broadly oblanceolate, acute, narrowed to a short petiole, 5 to 

 10 lines long, white-woolly below, soft pubescent above, the margins often 

 revolute; involucre almost bowl-shaped, 3 to 4 lines long, its (7 or 8) oblong 

 lobes as long or longer than the tube; flowers numerous in an involucre, form- 

 ing a globose cluster; calyx whitish, very villous inside and out, especially 

 towards the base, stipe-like at base, 4 lines long, the segments obovate or 

 elliptic, obtuse; filaments hairy on lower half; ovary densely villous except 

 at base. 



Lassen Co. to Shasta Co. and north to Washington. May-June. 



Locs. Susanville, Brandegee; Egg Lake, Baker $ Nutting; Willow Creek Valley, Modoc 

 Co., Austin; Pit Eiver Valley, Hall # Babcock 4253; Yreka, Butler 721, 1371, 1428. 



Refs. ERIOGONUM SPHAEROCEPHALUM Dougl.; Benth. Trans. Linn. Soc. 17: 407 (1837), 

 type loc. Columbia River, Douglas. 



53. E. tripodum Greene. Habit similar to E. sphaerocephalum but more 

 slender and taller (10 to 14 inches high) ; umbel 3-rayed, the rays 3 to 5 

 inches long, bearing a whorl of bracts at the middle or sometimes 2-forked 

 and again bracteate; calyx yellow, densely hairy, 2 to 3 lines long, the stipe- 

 like base very short; filaments hairy below; ovary very strongly angled, 

 hairy at apex. 



Indian Valley, Lake Co., Cleveland; Benton Mills Road, Mariposa Co., 



Congdon. 



Ref. ERIOGONUM TRIPODUM Greene, Pitt. 1: 39 (1887), type loc. Hough's Sprs., Lake Co., 

 K. Curran. E. sphaerocephalum var. brevifolium Stokes; Jones, Contrib. 11: 6 (1903). 



54. E. siskiyouensis Small. Like E. umbellatum but the involucre soli- 

 tary on an erect peduncle 4 to 10 inches high, with a whorl of bracts at 

 middle (that is, the umbel reduced to one ray which is as long or longer 

 than the peduncle) ; bracts foliaceous, ovate, petioled, 2 to 6 lines long, the 

 basal leaves of the same shape but usually larger. 



High montane: Scott Mts., Siskiyou Co.; Calaveras Big Trees, Brandegee; 

 Lake Merced, Jepson 3183. Hardly more than a variant of E. umbellatum 

 and yet unlike the dwarf monocephalous states of that species. 



Ref. ERIOGONUM SISKIYOUENSIS Small, Bull. Torr. Club, 25: 44 (1898), type loc. Scott 

 Mts., Greene. 



55. E. umbellatum Torr. SULPHUR-FLOWER. (Fig. 81.) Peduncles erect or 

 ascending from a branching woody base, naked, 3 to 5 inches high, tomen- 

 tulose or glabrate; leaves ovate, glabrate above, white-woolly beneath, 3 to 



