BUCKWHEAT FAMILY 417 



36. E. microthecum Nutt. Steins woody at base, diffusely but shortly 

 branched, 4 to JO inches high, whitish tomentulose throughout or the leaves 

 above and the stems and involucres glabrate; leaves oblong-spatulate to 

 elliptic, sometimes revolute, 4 to 8 lines long, shortly petioled; peduncles 1 

 to 4 inches long, bearing a small cymosely branched compound umbel; in- 

 volucres sessile, those in the axils pedicellate, narrowly campanulate, iy 2 

 lines long, shortly toothed; calyx white, pink or yellow, glabrous, 1 to iy 2 

 lines long, its lobes about equaling the tube; outer lobes round, often subcor- 

 date at base, the inner lobes elliptic. 



Eastern slope of the Sierra Nevada, 5000 to 10,000 feet. North to Washing- 

 ton, east to the Eocky Mts. 



Locs. Sonora Pass, Brewer 1888; Mono Pass, Bolander 6356; White Mts., Purpus 6424 

 (flowers yellow == var. aureum Stokes) ; Cottonwood Creek, Inyo Co., Purpus 1919 ; Bear Valley, 

 San Bernardino Mts. ace. Parish. 



Refs. EBIOGONUM MICROTHECUM Nutt. Jour. Acad. Phila. ser. 2. 1: 162 (1848), type loc. 

 hills east of Walla Walla, Nuttall; Parish, Zoe, 4: 166 (1893). E. effusum Nutt. 1. c. 164, 

 type loc. northern Eocky Mts., Nuttall. E. confertiflorum Benth. in DC. Prodr. 14: 17 (1856), 

 type loc. Shasta River, Wilkes Exped. 



E. COBYMBOSUM Benth. in DC. Prodr. 14: 17 (1856), type loc. Grand River, Fremont. 

 Watson (Bot. Cal. 2: 28) and Coville (Contrib. U. S. Nat. Herb. 4: 186) cite this species 

 as occurring on the eastern slope of the Sierra Nevada, but all Sierran specimens seen by us 

 are referable to E. microthecum. 



37. E. arborescens Greene. Shrubby, several feet high, the trunk 3 to 

 4 inches thick; leaves crowded at the ends of the many branchlets, linear or 

 oblong, strongly revolute, white-tomentose beneath, glabrate above, % to 1*4 

 inches long; peduncles stout, bearing a large compound cyme, the involucres 

 in capitate clusters; calyx rose-color, densely white-villous at base. 



Santa Barbara Islands : Santa Cruz ; Anacapa ; Santa Rosa. 

 Ref. ERIOGONUM ARBORESCENS Greene, Bull. Cal. Acad. I 1 : 11 (1884), type loe. Santa Cruz 

 Island, Kellogg $ Harford. 



38. E. giganteum Wats. Freely branching shrub 2 to 8 feet high, bear- 

 ing its white foliage towards the ends of the tomentose or glabrate branches; 

 trunk with rough bark, 1 to 4 inches in diameter; leaves leathery, ovate, ob- 

 tuse, 1 to 2y 2 inches long, white-lanate on both sides or glabrate above, strongly 

 veined beneath, the petioles y 2 to 1 inch long; peduncles stout, bearing a 

 dense tri- or di-chotomously branched compound cyme 2 to 12 inches broad; 

 involucres sessile or pedicellate, somewhat crowded on the branchlets, campan- 

 ulate with very low teeth, almost as if truncate, 2 lines long, densely close 

 woolly outside; calyx 1 line long, densely white-hairy toward the cuneate 

 base, its segments broadly obovate, rounded at apex, the inner narrower; fila- 

 ments pubescent at base. 



Santa Barbara Islands: Santa Catalina; San Clemente; Santa Cruz. 



Refs. ERIOGONUM GIGANTEUM Wats. Proc. Am. Acad. 20: 371 (1885), type loc. Santa 

 Catalina Isl., W. S. Lyon. Var. FORMOSUM K. Brandegee, Erythea, 5: 79 (1897), type loc. 

 San Clemente Isl., T. S. Brandegee; leaves oblong-lanceolate. 



39. E. cinereum Benth. Shrub 2 to 5 feet high, the stems tomentulose; 

 leaves ovate, puberulent above, obtusish, the larger abruptly short-cuneate 

 at base, undulate, thinly gray-tomentose beneath, y 2 to 1*4 inches long, short- 

 petioled; peduncles elongated, sparingly dichotomous, the heads few and 

 scattered in the forks; involucres tomentulose, iy 2 to 2 lines long, with 5 

 triangular teeth; calyx densely silky outside, its segments narrowly obovate, 

 obtuse, l!/2 lines long; filaments glabrous. 



Bluffs and foothills along the coast: Santa Barbara to Santa Monica and 



San Pedro. 



Ref. ERIOGONUM CINEREUM Benth. Bot. Sulph. 45 (1844), type loc. San Pedro. 



40. E. parvifolium Smith. Shrub 1 to 3 feet high, or woody only at base ; 

 branches densely leafy with fascicled leaves; leaves thick, oblong-lanceolate 



