BUCKWHEAT FAMILY 417 



36. E. microthecum Xutt. Steins woody at base, difftisely but shortly 

 branched, 4 to 10 inches high, whitish tomentulose througliout or the leaves 

 ;il>ove 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, IV2 

 lines long, shortly toothed; calyx white, pink or yellow, glabrous, 1 to I14 

 lines long, its lobes about erpialing 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 Rocky ilts. 



Locs. — Souora Pass, Brewer 18S8; Mono Pass, BoJunder (i3o6; White Mts., Purpiis 6424 

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

 San Bernardino Mts. ace. Parish. 



Eefs. — Erioconum microthecum Nutt. .Tour. Acad. Phila. ser. 2. 1: 162 (1848), type loe. 

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

 type loc. northern Rocky Mts., NutlaU. E. confertiftorum Benth. in DC. Prodr. 14: 17 (1836), 

 type loc. Shasta River, Wilkes Exped. 



E. coRYMBOSUM Benth. in DC. Prodr. 14: 17 (18.'56), type loc. Grand River, Fremont. 

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

 as occurring on the eastern slope of the Sierra Nevada, but all Sicrran s[iecimens seen by us 

 are referable to E. microthecum. 



:i7. E. arborescens Greene. Shrubby, several feet high, the trunk 3 to 

 4 inches ttiii-k; leaves crowded at the ends of the many branchlets, linear or 

 oblong, strongly revolute, white-tomentose beneath, glabrate above, % to I14 

 inches long; peduncles stout, bearing a large compound ej^me, 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. 1': 11 (1884), type loc. Santa Cruz 

 Island, Kelloeifj <f- 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 roiigli bark, 1 to 4 inches in diameter; leaves leathery, ovate, ob- 

 tuse, 1 to 21/0 inches long, white-lanate on both sides or glabrate above, strongly 

 veined beneath, the petioles I/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. — ERiOfioNUM GIGANTEUM Wats. Proc. Am. Acad. 20: 371 (188.5), type loc. Santa 

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

 San Clemente fsl.. 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, undtdate, thinly gray-tomentose beneath, y_. to V/^ inches long, short- 

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

 scattered in the forks; involucres tomentulose, IV2 to 2 lines long, with 5 

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

 obtuse, li/L' lines long; filaments glal)rous. 



Bluff's and foothills along the coast: Santa Barbara to Santa Monica and 

 San Pedro. 



Ref. — Eriogoxum cixereum 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 



