406 POLYGONACEAE 



R e f s . ERIOGONUM GRACILLIMUM Wats. Bot. Cal. 2: 480 (1880), type loc. Mohave Desert, 

 Bush. E. variable Heller, Muhl. 2: 24 (1905), type loc. Mohave, Heller 7756. E. angulosum 

 var. victorense Jones, Contrib. 12: 74 (1908), type loc. Victor, Mohave Desert, Jones. 



3. E. gossypimim Curran. Diffusely branched from the base, 4 to 10 inches 

 high, thinly tomentose throughout or the upper parts glabrate; leaves oblan- 

 ceolate, narrowed to a short petiole, or the upper oblong or lanceolate and, 

 mostly sessile, 1 to 2 inches long; involucres 1% lines long, borne on pedicels 

 1 to 6 lines long, turbinate, cleft to the middle, glabrous outside, heaped inside 

 with a cottony wool in which the 5 to 8 flowers are concealed; calyx 1/2 li ne 

 long, obscurely puberulent, the outer segments oblong or spatulato, the inner 

 linear, acuminate, longer. 



Upper San Joaquin Valley. A remarkable species. 

 Locs. Kern Co.: Oil City, Seller 7748; Caliente Creek, Davy 1885. 



Kefs. ERIOGONUM GOSSYPINUM Curran, Bull. Cal. Acad. 1: 274 (1885), type loc. Bakers- 

 field; Greene, Fl. Fr. 152 (1891). 



4. E. spergnlinum Gray. Stems erect, dichotomously branching, 4 to 11 

 inches high, minutely glandular pubescent or the upper half of the internodes 

 usually glabrous ; leaves linear, revolute, hairy, y 2 t 1% inches long, in whorls 

 at the base of the stem and at the lower forks, reduced above to small bracts ; 

 involucres i/4 line long, deeply 4-toothed, on pedicels 3 to 6 lines long; bract- 

 lets none; calyx white with pink midveins, % to 1*4 lines long, obscurely 

 puberulent at base, the segments oblong-quadrate, erosulate at apex or merely 

 acute. 



Mountain slopes, North Coast Ranges and Sierra Nevada, 5000 to 9000 feet. 



Locs. Snow Mt., Lake Co., K. Brandegee; South Yollo Bolly, Jepson; Ash Creek, Siskiyou 

 Co., M. S. BaTcer ; Lassen Peak, Jepson 4071; Spanish Peak, Mrs. E. M. Austin; Summit, 

 Nevada Co., Jepson; Yosemite, Lembert ; Little Yosemite, Jepson 3152, 4402; Mt. Silliman, 

 Jepson 716 ; near Mt. Whitney, Jepson 948 ; Alta Mdws., Hopping 509 ; near Kaweah Peaks, 

 Jepson 5008; Sky Valley, Tulare Co., Eastwood; Mt. Pinos, Hall 6659. 



Eefs. ERIOGONUM SPERGULINUM Gray, Proc. Am. Acad. 7: 389 (1868), type loc. Big 

 Creek, near Mariposa Grove, Bolander. Oxytheca spergulina Greene, Fl. Fr. 153 (1891). 0. 

 reddingiana Jones, Bull. Torr. Club, 9: 32 (1882), type loc. Soda Sprs. near Donner. 



5. E. hirtiflorum Gray. Repeatedly dichotomously branched, 4 to 9 inches 

 high, the stems lightly sprinkled with minute often stipitate glands, otherwise 

 glabrous ; leaves obovate, drawn down to a petiole-like base, sparingly hirsutu- 

 lose, especially on the margins, % to 1% inches long ; involucres sessile along 

 the branches and in the forks, or often on pedicels 1 to 3 lines long, narrow, 

 2-flowered; calyx reddish, % line long, its segments oblong, clothed with 

 hooked hairs on the back; achene exserted. 



Middle altitudes, Sierra Nevada and North Coast Ranges. 



Locs. Old Colony Mill, Jepson 626; Giant Forest and Ockenden, K. Brandegee; Coulter- 

 ville, Jepson; Mariposa, Congdon; Bartletts, Lake Co., T. Brandegee; Mt. Konocti, Jepson; 

 Seotts Valley, Lake Co., J. P. Tracy 1650; Eed Mt., Mendocino Co., Eastwood; Edgewood, 

 Brandegee. 



Eefs. ERIOGONUM HIRTIFLORUM Gray; Wats. Proc. Am. Acad. 12: 259 (1877), type loc. 

 Tuolumne Co., Sierra Nevada, Gray. Oxytheca hirtiflora Greene, Fl. Fr. 153 (1891) ; Jepson, 

 Erythea, 1: 14 (1893), Fl. W. Mid. Cal. 151 (1901). A species closely connecting Eriogonum 

 and Oxytheca, a reference to the latter genus satisfying in some respects its natural affinities. 

 Such a reference would, however, also involve the transfer of its near allies, E. spergulinum, 

 inerme, apiculatum, ordii and parishii. 



6. E. inerme Jepson n. comb. Stems 1 to 3 from the base, repeatedly and 

 divaricately dichotomous, 3 to 10 inches high ; leaves in a basal rosette, broadly 

 spatulate, ^/2 to 1 inch long, sessile, glabrous save the ciliate margin; bracts (2 

 or 3 lines long) and branches hispidulose-glandular ; involucres 4-cleft nearly 

 to the base, 3 to 6-flowered, shortly pedicelled (pedicels 14 to y 2 line long) ; 

 flowers rose-color ; calyx hispid, its hairs hooked at tip, at least in age ; inner 

 calyx segments smaller than the outer and retuse. 



