410 



POLYGONACEAE 



Fig. 75. EBIOGONUM THURBERI Torr. 

 a, flowering branchlet, x 1; b, 

 flower, x 10. 



ments ovate, the margin in age saccate-dilated on each side of the cordate base, 

 the inner segments linear-spatulate, finally exceeding the outer. 

 Colorado Desert, north to Inyo Co. East to Arizona and Utah. 



Locs. Calexico, Abrams 3152; Chuckawalla Spr., Hall 5899; Coachella, Hall 5812. 



Refs. ERIOGONUM THOMASII Torr. in Pac. E. Rep. 5 2 : 364 (1857), type loc. Ft. Yuma, 

 Major Thomas. E. minutiflorum Wats. Proe. Am. Acad. 26: 125 (1891), type loe. Colorado 

 Desert, Orcutt, Apr. 1890, the segments less strongly saccate, otherwise the same. 



E. DESERTICOLUM Wats. Proc. Am. Acad. 26: 125 (1891), type loc. s.w. Colorado Desert, 

 Orcutt 2189. Calyx yellow, villous. Very obscure; collected only once. 



15. E. thurberi Torr. (Fig. 75.) Stems 1 

 or several from the base, diffusely and trichot- 

 omously branched, 4 to 13 inches high, tomen- 

 tulose towards the base ; leaves in a basal rosu- 

 late cluster, ovate to broadly oblong, woolly 

 below, less so above, y 2 to 2 inches long, the 

 petioles about as long or longer; peduncles in 

 the forks and terminal, 2 to 12 lines long; 

 involucres 1 line long, nearly hemispherical; 

 calyx rose-red or white, y 2 to % line long; 

 outer calyx segments roundish or transversely 

 elliptic, abruptly narrowed to a broad claw, a 

 floe of wool at summit of claw; inner calyx 

 segments narrowly linear or lanceolate, some- 

 what hastately lobed near base, y^ as wide as 

 outer segments. 

 San Bernardino Valley south to San Diego Co. and Lower California, east 



to Arizona. 



Locs. g an Bernardino Valley, Parish, Jepson 5563 ; Palm Canon, Mt. San Jacinto, Jepson 

 1401; Temecula River, Jepson 1553. 



Refs. ERIOGONUM THURBERI Torr. Bot. Mex. Bound. 176 (1859), type loc. San Pasqual, 

 San Diego Co., Thurber. Var. parishii Gand. Bull. Soc. Roy. Bot. Belg. 42: 198 (1905), type 

 loc. San Bernardino, Parish 2820. 



16. E. cernuum Nutt. Stems glabrous, glaucous, diffusely di- or tri-choto- 

 mously branched, 6 to 14 inches high; leaves round to oval, white woolly 

 below, glabrate above, 6 to 9 lines long, the petioles nearly as long; pedicels 

 deflexed, y 2 to 4 (or 7) lines long, somewhat racemose on the branches; in- 

 volucres narrowly turbinate ; calyx white, glabrous, % to 1 line long, narrowed 

 to a shortly clavate base, its segments obovate or somewhat quadrate, undu- 

 late, retuse, the inner half as broad. 



Colorado Desert (Warren's Well, Brandegee) . North to Nevada and Ore- 

 gon, east to the Rocky Mts. 



Ref. ERIOGONUM CERNUUM Nutt. Jour. Acad. Phila. ser. 2, 1: 162 (1848), types from 

 Columbia River plains and in the Rocky Mts., Nuttall. 



17. E. nutans T. & G. Similar to E. cernuum but pedicels glandular ; base 

 of calyx very obtuse (attenuate in E. cernuum). 



Northwestern Nevada. Lassen Co. ace. Bot. Cal. 2 : 23. 



Ref. ERIOGONUM NUTANS T. & G. Proc. Am. Aead. 8: 181 (1870), type spms. from Lassen 

 Co. and n.w. Nev. 



18. E. watsonii T. & G. Similar to E. cernuum ; stem sometimes a little in- 

 flated; branches erect; leaves round-cordate; pedicels divaricately spreading, 

 1 to 4 lines long ; calyx segments oblong, subcordate at base. 



Lockwood Valley, Mt. Pinos, Dudley & Lamb 4683; thence easterly to 

 Nevada. An ill-defined species so far as the Californian material is concerned, 

 apparently passing into E. deflexum. 



Locs. Tehachapi, Stolces; Walker Pass, Brandegee. 



Refs. ERIOGONUM WATSONII T. & G. Proc. Am. Acad. 8: 182 (1870), type loc. Humboldt 

 Mts., Nev. E. baratum Elmer, Bot. Gaz. 39: 52 (1905), type loe. betw. Griffin and Mt. Pinos, 

 Elmer 3593. 



