414 POLYGONACEAE 



Var. tomentosum Wats. Stems thinly tomentose. San Bernardino Mts. 

 Of doubtful affinity. 



Refs. ERIOGONUM BAILEYI Wats. Proc. Am. Acad. 10: 348 (1875), type spms. from desert 

 valleys east of the Sierra Nevada. Var. BRACHYANTHUM Jepson. E. brachyanthum Cov. Con- 

 trib. U. S. Nat. Herb. 4: 185 (1893), type loe. Indian Wells, Inyo Co., Coville. Var. TOMEN- 

 TOSUM Wats. Proc. Am. Aead. 12: 268 (1876). 



27. E. dasyanthemum T. & G. (Fig. 78a.) Stems thinly tomentose or 

 soon glabrate, 1 to 2 feet high, branching from or near the base, and often 

 bush-like in habit; leaves roundish, plane, tomentose below, less go above, 

 y 2 to 1^2 inches long, abruptly contracted to a slender petiole half to as long ; 

 involucres 1 or 2 in a place, rather remote, cylindric, 2 lines long, tomentose 

 between the callous ribs ; calyx white or red, 1 line long, densely hairy on out- 

 side, glabrous inside; filaments glabrous or slightly pubescent at very base. 



Low dry hills, inner Coast Range from the Vaca Mts. to Lake Co. and 

 north to the Yollo Bollys. Sept.-Nov. This seems quite to replace E. vimineum 

 of the middle North Coast Range. 



Locs. Vaca Mts., Jepson; Knoxville grade, Jepson; Guinda, Rowena Beans; Sulphur Bank, 

 Lake Co., Agnes Bowman; Yollo Bolly, Brandegee. 



Eefs. ERIOGONUM DASYANTHEMUM T. & G. Proc. Am. Acad. 8: 177 (1870), type loc. Clear 

 Lake, Bolander, Torrey. Var. jepsonii Greene, Fl. Fr. 150 (1891), type loc. Gates Canon, Vaca 

 Mts., Jepson in 1887. 



28. E. mohavense Wats. Stems 1 or several from the base, repeatedly tri- 

 and di-chotomously branched, 4 to 12 inches high, glabrous or a little hairy 

 at the nodes; branches green, bracts often red; leaves in a rosulate basal 

 cluster, roundish or ovate, 2 to 6 lines long, abruptly narrowed to a slender 

 petiole; involucres turbinate-bellshaped, very shortly 5-toothed, glabrous out- 

 side, a hairy ring inside at throat, % line long, sessile in the forks and ter- 

 minal on the short branchlets; calyx yellow, glabrous, i/o line long, the outer 

 segments oblong or elliptic, the inner segments sometimes white, half as bcoad ; 

 achene partly exserted. 



Dry hills, Mohave Desert. Involucres almost flaring just at mouth. Re- 

 markable for the small size of its flowers. 



Locs. Lancaster, K. Brandegee; Kramer, Jepson 5321, 5337; Barstow, Jepson 4818; Indian 

 Wells, Hall $ Chandler 7367. 



Eefs. ERIOGONUM MOHAVENSE Wats. Proc. Am. Acad. 12: 266 (1877), type loc. Mohave 

 Valley, Palmer. E. delicatulum Wats. Proc. Am. Aead. 17: 379 (1882), type loc. Mohave 

 Desert, Parry; "Resembling E. mohavense but smaller and more slender, with narrower and 

 less strongly nerved involucres and the achenes exserted. ' ' Not known to us. 



29. E. truncatum T. & G. Stems mostly several from the base, thinly 

 tomentose or glabrate, 6 to 15 inches high, naked, bearing a leafy-bracted 

 irregular umbel ; leaves obovate or obloug-oblanceolate, with undulate margin, 

 1 to 2 inches long, attenuate to a slender petiole nearly as long; umbel of 3 

 to 6 elongated unequal rays loosely once or twice di- or tri-chotomous ; bracts 

 almost minute; involucres 2 to 4 in a cluster or solitary, tomentose, oblong- 

 turbinate, 2 lines long; calyx light rose-color, glabrous, 1% lines long; fila- 

 ments pubescent at very base. 



East base of Mt. Diablo north to Antioch. The sinuses between the invo- 

 lucral teeth are completely filled by a membrane so that the involucre is 

 truncate. 



Var. adsurgens Jepson n. comb. (E. adsurgens Stokes in hb.) Leaves 

 roundish, 5 to 11 lines broad, abruptly long-petioled ; involucres turbinate, 1 

 line long, obviously toothed. (Folia suborbicularia, lin. 5-11 lata, abrupte 

 longo-petiolata ; involucra turbinata, linea longa, subdentata.) Inner South 

 Coast Range from Warthan, Eastwood, May 11, 1893, type, to Hernandez, 

 Eastwood. 



Ref. ERIOGONUM TRUNCATUM T. & G. Proc. Am. Acad. 8: 173 (1870), type loc. Mt. 

 Diablo, Brewer. The exact station for the type is "Dry hillsides at Marsh's Ranch" at east 



