BUCKWHEAT FAMILY 35 



38. Eriogonum argillosum J. T. Howell. Clay-loving Eriogonum. Fig. 1386. 



Eriogonum argillosum J. T. Howell, Leaflets West. Bot. 1: 13. 1932. 



Annual, with the stem striate but not angled, the first internode of the main stem 3-10 cm. 

 long, with or without a few secondary stems from the base, the branches usually 3-4 from a node 

 simulating a compound umbel, glabrous or very sparingly tomentose. Basal leaves with oblong 

 blades, 15-25 mm. long, narrowed to slender petiole as long or longer, densely white-tomentose 

 beneath, less so above, obscurely revolute-margined ; stem leaves at the first node similar but 

 much reduced, short-petioled ; those of the upper nodes reduced to bracts ; stipules lanceolate-sub- 

 ulate, scarious-tomentose within; involucre turbinate, 2.5 mm. high, lobes obscure, indicated by 

 broad green midribs, the sinuses scarious ; bractlets filiform ; calyx-lobes rose or white tinged with 

 rose, with a dark midrib 1 . 5 mm. long, outer oblong, inner similar but slightly narrower, entire 

 or crenulate ; achene about 2 mm. long. 



Clay soil and serpentine outcrops, Upper Sonoran Zone; Santa Clara to San Benito and Monterey Counties, 

 California. Type locality: Poncho Rico Canyon, east of San Bernardo, Monterey County, California. March- 

 June. 



39. Eriogonum vestitum J. T. Howell. Idria Eriogonum. Fig. 1387. 



Eriogonum vestitum J. T. Howell, Leaflets West. Bot. 2: 42. 1937. 



Annual, the stem erect, 1-4 dm. high, simple below, di- or trichotomous above, densely white- 

 tomentose, branches ascending. Basal leaves alternate, elliptic to oblong-elliptic, 1-3 cm. long, 

 obtuse or acutish at apex, cuneate at base, tomentose on both surfaces; petioles slender, 2-3.5 cm. 

 long ; stem leaves verticillate at the first and second nodes, similar to the basal but smaller, those 

 of the upper nodes reduced to bracts ; peduncles 1-6 cm. long ; involucre solitary, campanulate- 

 turbinate, 2 mm. long, 5-lobed, the sinuses narrow, scarious ; calyx white with reddish midvein, 

 the lobes oblong-ovate, 1.5 mm. long, little enlarged in fruit, the outer surface papillose on the 

 midrib and margin ; filaments hairy at base ; achene papillose on the beak. 



Dry slopes, Upper Sonoran Zone; South Coast Ranges, San Benito County, California. Type locality: talus 

 of disintegrating shale, 4 miles from Idria on road to Panoche, San Benito County. April-June. 



40. Eriogonum nidularium Coville. Bird-nest Eriogonum or Whisk-broom. 



Fig. 1388. 



Eriogonum nidularium Coville, Contr. U.S. Nat. Herb. 4: 186. 1893. 



Eriogonum vimineum subsp. nidularium Stokes, Gen. Eriog. 49. 1936. 



Eriogonum nidularium var. luciense M. E. Jones, Contr. West. Bot. No. 11: 17. 1903. 



Annual, the stems repeatedly dichotomously branched from or near the base, 5-20 cm. high, 

 the branches numerous with short internodes, at length the outer branches often turned inward to 

 form a dense crown suggesting a bird's nest, closely and rather densely floccose. Leaves all basal, 

 floccose, the blades rounded, cordate at base, 1-2.5 cm. broad, on petioles 2-3 times as long; bracts 

 subulate-triangular, 2-3 mm. long ; involucres occurring at almost every node, sessile, barely over 

 1 mm. high ; flowers solitary or usually 2-3 in an involucre, yellowish or sometimes reddish or 

 white, 1 . 5 mm. long, glabrous ; outer lobes broad and truncate at the apex, the sides concave, the 

 inner lobes similar but smaller ; ovary and achene scabrous above. 



Rocky canyons and hillsides, Lower Sonoran Zone; Mojave Desert region, Kern and San Bernardino Coun- 

 ties, California, to western Nevada. Type locality: Cottonwood Canyon, Panamint Mountains, California. 

 Apr'il-Oct. 



41. Eriogonum dasyanthemum Torr. & Gray. Many-flowered Eriogonum. 



Fig. 1389. 



Eriogonum dasyanthemum Torr. & Gray, Proc. Amer. Acad. 8: 177. 1870. 

 Eriogonum dasyanthemum var. Jepsonii Greene, Fl. Fran. ISO. 1891. 



Annual, branched from the base or simple to the first node, usually widely branched above, 

 floccose-tomentose, often soon glabrate, 2-5 cm. high. Basal leaves rounded, 8-20 mm. broad, 

 white-tomentose beneath, glabrate above ; petioles about the same length ; stem leaves confined to 

 the first and second nodes, round-ovate, usually longer than their petioles ; involucres 3 . 5-4 mm. 

 long, usually solitary at the nodes, distinctly ribbed, 5-toothed, the sinuses open; flowers often 15- 

 20 to each involucre ; calyx white or rose, 2 mm. long, villous-pubescent without, glabrous within ; 

 outer lobes oblong-obovate, rounded at apex; filaments glabrous or sparingly pubescent at very 

 base ; achene 2 mm. long, the beak scabrous, longer than the body. 



Open gravelly places, Upper Sonoran Zone; North Coast Ranges, California. Type locality: near Clear 

 Lake, Lake County, California. June-Oct. 



42. Eriogonum elegans Greene. Elegant Eriogonum. Fig. 1390. 



Eriogonum elegans Greene, Pittonia 2: 173. 1891. 

 Eriogonum vimineum var. elegans Jepson, Fl. Calif. 413. 1914. 



Annual, the stem erect, repeatedly dichotomously branched above, the ultimate virgate 

 branches very slender, 2-4 dm. high, reddish, glabrous and glaucescent throughout except for the 

 leaf-bearing base, this white-woolly. Leaves basal, densely white-woolly on both surfaces and 

 petioles, the blades rounded or subcordate at base, undulate on the margins, 8-20 mm. broad; 

 involucres 1 mm. long, turbinate, nerveless, 5-toothed, glabrous except the ciliolate margin; 

 calyx rose red, 1 mm. long, glandular-puberulent without, the lobes oblong-obovate. 



Sandy flats and washes, Sonoran Zones; Inner South Coast Ranges, central California. Type locality: 

 sandy bed of the upper Salinas River, Monterey County, California. July-Sept. 



