412 POLYGONACEAE 



21. E. gracile Benth. Stems strictly branched and forming a narrow pan- 

 icle or more diffuse, l / 2 t ^Vz ^ ee t high; thinly tomentose throughout, be- 

 coming floccose; leaves oblanceolate or broadly oblong, attenuate to a slender 

 petiole, 1/2 to 2 inches long, tomentose on both sides or less so above; bracts 

 more or less elongated, equaling nearly or quite the involucres, or the lower 

 somewhat foliaceous; involucres along the elongated branches, glabrous or 

 nearly so, barely exceeding the bracts and half concealed by them, % to 1 

 line long, cylindric-campanulate, the teeth acute, prominent, spreading; calyx 

 white, rose-color or yellowish, glabrous, % line long. 



Dry plains, valleys and low hills. Great Valley and Coast Ranges to South- 

 ern California. Lower California. 



Locs. Witch Creek, Alderson; Eiverside, Zwribro; San Bernardino, Parish 3822; Los 

 Angeles, E. D. Palmer; Antelope Valley, Lyell; Soledad, Congdon; Lathrop, K. Brandegee; 

 Vaca Mts., Jepson. 



Eefs. ERIOGONUM GRACILE Benth. Bot. Sulph. 46 (1844), type loe. San Pedro, Hinds; 

 Jepson, Fl. W. Mid. Cal. 154 (1901). E. agninum Greene, Pitt. 2: 165 (1891), type loe. Santa 

 Inez Mts., n. slope. 



22. E. citharaeforme Wats. Stems 1 or several from the base, freely 

 branching, 1 to 3 feet high; herbage thinly tomentose, glabrous or glabrate 

 above ; leaves in a basal rosette, or a few at the lower nodes, roundish to ovate, 

 % to 2 inches long, gradually or cordately contracted to a long winged petiole, 

 the wing crenulately toothed, attenuate downward; involucres turbinate, li/o 

 lines long. 



San Luis Obispo Co. east to the inner South Coast Ranges. A local and 

 indefinitely known species. Perhaps only a variety of E. virgatum. 



Eef. ERIOGONUM CITHARAEFORME Wats. Proc. Am. Acad. 23: 266 (1888), type loe. Baron 

 Schroeder's Ranch, Santa Margarita, Lemmon 1584. 



23. E. virgatum Benth. Tomentose throughout, stem slender, erect, simple, 

 or the few branches rather strict, 1 to 3 feet high; leaves in whorls on lower 

 part of stem or rosulate at the base, oblanceolate (or obovate), ^ to 2 inches 

 long, on slender petioles, the margin usually undulate ; involucres 2 to 2y 2 lines 

 long, rather remote, tomentose, cylindric, truncate or nearly, the teeth minute ; 

 bracts lanceolate, shorter than the involucres; calyx glabrous, 1 line long, 

 white, buff, sulphur-yellow or pink. 



Stream beds : Coast Ranges ; Sierra Nevada, 500 to 5000 feet. 



'Locs. Quartz Valley, Siskiyou Co., Butler 203; Hy-am-pum, Chesnut fy Drew; Middle Creek, 

 Lake Co., Tracy 2358; Cloverdale, Jepson; Putah Creek, Jepson; Walnut Creek, Jepson; Los 

 Buellis Hills, Santa Clara Co., E. J. Smith; New York Falls, Amador Co., Hansen 163; San 

 Andreas, Jepson; Crockers, Yosemite Park, Jepson 4636; Coulterville, Jepson; Redwood Canon, 

 E. Fork Kaweah River, Jepson 1159; S. Fork Kaweah River, Culbertson 4404; Upper Grouse 

 Valley, Tulare Co., Jepson 4707; Tehachapi, Stokes; Griffin, Ventura Co., Hall 6335. 



Refs. ERIOGONUM VIRGATUM Benth. in DC. Prodr. 14: 16 (1856), type from California, 

 Fremont. E. roseum Dur. & Hilg. Pac. R. Rep. 5 3 : 14, pi. 15 (1855), type loe. Pose Creek, 

 Kern Co., Heermann; lower nodes of panicle leafy; flowers rose-red. 



24. E. molestum Wats. Habit of E. vimineum, glabrous and glaucous 

 above the white-woolly leaves ; leaves roundish or cordate, crisped or undulate, 

 4 to 6 lines long; flowers white, % to 1 line long; involucres cylindric- 

 turbinate, 2 l / 2 lines long; ovary scaberulous. 



San Gabriel, San Bernardino and San Jacinto mountains to San Diego. 



Var. davidsonii Jepson n. comb. Habit and foliage of E. molestum but 

 involucres only 1% lines long, cylindric-prismatic ; bracts more united and 

 cup-like. San Gabriel Mts. to the San Jacinto Mts. 



Refs. ERIOGONUM MOLESTUM Wats. Proc. Am. Acad. 17: 379 (1882), type spms. from 

 mountains of S. Cal. Var. DAVIDSONII Jepson. E. davidsonii Greene, Pitt. 2: 295 (1892), type 

 loe. Wilson Peak, Davidson. 



25. E. vimineum Dougl. (Fig. 78b.) Stems 1 or several, glabrous wholly 

 or at least above the base, erect, 3 to 18 inches high, much branched from 



