416 POLYGONACEAE 



Locs. Mt. San Jacinto, Hall 816; San Bernardino 'Mts., Blasdale; Antimony Mt. near San 

 Emigdio, Brandegee ; Mineral King, Brandegee; Sequoia Park, Fry; S. Fork San Joaquin 

 River, Hall 4' Chandler 639; Sentinel Dome, Yosemite, Jepson 5647; Donner Lake, Heller 7165. 



Var. membranaceum Stokes in hb. Petioles dilated at base into a sheath 

 clasping the stem; leaves glabrate above; sheaths soon glabrate, y% to 1 line 

 long. (Petiolata basi ochreata; ochreae glabrescentae, lin. ^-1 longae; folia 

 supra glabra.) Southern California mountains. 



Locs. Julian, Dunn; Cuyamaca Peak, Brandegee; Mt. San Jacinto, Vanderventer. 



Refs. ERIOGONUM WRIGHTII Torr. ; Benth. in DC. Prodr. 14: 15 (1856), type w. Texas, 

 Wright. E. trachygonum Torr. in DC. Prodr. 14: 15 (1856), type coll. in California by 

 Wilkes Exped.; Jepson, Fl. W. Mid. Cal. ed. 2, 133 (1911). E. wrightii var. trachygonum 

 Jepson, Fl. W. Mid. Cal. 154 (1901). Var. SUBSCAPOSUM Wats. Bot. Cal. 2: 29 (1880). 

 E. curvatum Small, Bull. Torr. Club, 25: 50 (1898), type loc. Long Mdw., Tulare Co., Dr. 

 Palmer 207. E. junceum Greene, Leaflets, 1: 77 (1904), type loc. Kern Canon, Culbertson 

 4396, the wire-like peduncles and the involucres soon glabrate but not otherwise different. 



33. E. nodosum Small. Stems several from the base, tri- or di-chotomously 

 branching, leafy below, % to 1^ (or "S 1 /^") feet high, white-tomentulose ; 

 involucres turbinate-cylindric, 1^ lines long, sessile and unilaterally crowded 

 on the ultimate (% to 1 inch long) branchlets or pedicellate in the forks; 

 calyx glabrous, 1% lines long, parted about half-way, the base coriaceous; 

 outer segments roundish, notched at apex, the inner similar, half as broad; 

 filaments pilose below the middle; achene minutely scaberulous. 



Desert region : White Mts., Inyo Co. ; Imperial Co. Nevada ; Lower 



California. 



Ref. ERIOGONUM NODOSUM Small, Bull. Torr. Club, 25: 49 (1898), type loc. Dos Cabezas 

 (near Coyote Well, Colorado Desert), Orcutt 1462. 



34. E. heermannii Dur. & Hilg. Stems woody at base, leafy below, soon 

 branching into a panicle, l 1 /^ to 2 feet high ; peduncle of the panicle short, 

 repeatedly 2 or 3-forked and finally ending in somewhat spinescent branch- 

 lets; forks of the panicle rather short but straightish, rigid, somewhat divari- 

 cate, as if fistulous and a little constricted at the joints; plant flocculent or 

 glabrate on lower part, glabrous above ; leaves oblong, 6 to 8 lines long, 

 petioled ; involucres hemispherical or broadly turbinate, 1 line long, the broad 

 rounded lobes scarious-margined and overlapping at the sinuses; calyx 1 

 to l 1 /^ lines long, glabrous, the outer segments orbicular, the inner oblong, 

 much narrower. 



Mohave Desert northward to the southern Sierra Nevada and west to Mt. 

 Pinos, Hall 6737. Nevada. 



Ref. ERIOGONUM HEERMANNII Our. & Hilg. Pac. R. Rep. 5 s : 14, pi. 17 (1885), type loc. Pose 

 Creek, Kern Co., Heermann. 



E. SULCATUM Wats. Proc. Am. Acad. 14: 296 (1879). Very similar; branches of the panicle 

 angular, minutely scabrous. Utah ; Nev. To be looked for in the Death Valley region. Cf . 

 var. argense Jones, Contrib. 11: 15 (1903), type loc. Argus Mts. 



35. E. plumatella Dur. & Hilg. Stems woody at base, 1 to 2 feet high, 

 the branches straightish or zig-zag, covered with a dense thin tomentum; 

 forks (or internodes) of the panicle short, somewhat curved, continuously 

 divaricate so that the inflorescence eventually appears almost contorted; 

 involucres narrowly campanulate, glabrous outside, the teeth pubescent in- 

 side, not scarious margined; calyx white or pinkish, % line long; outer seg- 

 ments obovate, truncatish, inner obovate, rounded or subacute, all cuneate at 

 base; filaments a little hairy at base; beak of the ovary 3-angled, roughish. 



Southern Sierra Nevada (Walker Pass ace. Coville) and south into the 

 Mohave Desert (Lanfair, Maye L. Tennent). Flowers in rather small and com- 

 pact clusters towards the ends of the rather long panicle branches. 



Refs. ERIOGONUM PLUMATELLA Dur. & Hilg. Pac. R. Rep. 5 3 : 14, pi. 16 (1855), type loc. 

 Pose Creek, Kern Co., Heermann; Cov. Contrib. U. S. Nat. Herb. 4: 187 (1893). E. palmeri 

 Wats. Proc. Am. Acad. 12: 267 (1877), type spms. from Julian and San Felipe in San Diego 

 Co. and s. Utah, Palmer. 



