36 POLYGONACEAE 



43. Eriogonum Baileyi S. Wats. Bailey's Eriogonum. Fig. 1391. 



Eriogonum Baileyi S. Wats. Proc. Amer. Acad. 10: 348. 1875. 

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

 Eriogonum demissum Stokes, Gen. Eriog. 49. 1936. 



Annual, the stems 1-4 dm. high, solitary and simple to the first node or sometimes several 

 from the base, diffusely branched above, the branchlets mostly ascending, glabrous and glaucous 

 throughout. Leaves all basal, densely white-tomentose on both surfaces, orbicular to round-ovate, 

 5—15 mm. broad ; bracts triangular-subulate, small ; involucres sessile, appressed to the branchlets, 

 1 . S mm. long, the erect teeth pubescent on the margins, otherwise glabrous ; calyx white, more or 

 less tinged with pink, 1 . 5 mm. long, minutely glandular ; outer lobes ovate-oblong, the inner nar- 

 rower ; achene flask-shaped, the beak exceeding the somewhat compressed body. 



Dry desert slopes, Upper and Lower Sonoran Zones; southeastern Washington to Nevada, Arizona, and 

 the Mojave Desert, California. Type locality: northwestern Nevada. May-Aug. 



44. Eriogonum brachyanthum Coville. Short-flowered Eriogonum. Fig. 1392. 



Eriogonum brachyanthum Coville, Contr. U.S. Nat. Herb. 4: 185. 1893. 

 Eriogonum Baileyi var. brachyanthum Jepson, Fl. Calif. 414. 1914. 

 Eriogonum vimineum var. brachyanthum Stokes, Gen. Eriog. 50. 1936. 



Annual, diffusely branched from near the base, in vigorous plants forming a broad round- 

 topped crown, 2-3 dm. high, green and glabrous above, persistently woolly-pubescent at base. 

 Leaves all basal, rounded or broadly ovate, rounded or subcordate at base, 8-20 mm. broad, 

 densely white-woolly on both surfaces ; petioles slender, longer than the blades ; bracts minute, 

 glabrous without; involucre 1 mm. long, closely appressed to the stem, sometimes also in the 

 axil of the terminal bracts, glabrous; usually 4-6-flowered; calyx glabrous, pale yellow, about 0.7 

 mm. long, outer lobes oblong or oblong-obovate, the inner a little narrower ; achene about 1 mm. 

 long, the slender beak slightly exserted. 



Dry gravelly or sandy soils, Mojave Desert. California, to western Nevada. Type locality: "a few miles 

 north of Indian Wells, Inyo County, California. ' May-Aug. Yellow Buckwheat. 



45. Eriogonum virgatum Benth. Virgate Eriogonum. Fig. 1393. 



Eriogonum virgatum Benth. in DC. Prod. 14: 16. 1856. 

 Eriogonum roseum Dur. & Hilg. Pacif. R. Rep. 53: 14. pi. 15. 1856. 

 Eriogonum vimineum subsp. virgatum Stokes, Gen. Eriog. 53. 1836. 



Annual, the stems almost always solitary, with comparatively few strictly virgate branches, 

 1-7 dm. high, floccose-tomentose throughout. Basal leaves oblong-oblanceolate, 1-3 cm. long, the 

 petioles of about the same length, white-tomentose on both surfaces or somewhat glabrate above; 

 the lower nodes usually bearing one or two similar but shorter-petioled leaves; bracts of the 

 flower-bearing branches triangular-subulate; involucres cylindric, 3 mm. long, densely white- 

 tomentose, grooved between the broad rounded ribs, the teeth erect, acutish ; flowers several to 

 many ; calyx glabrous, 2 mm. long, yellow or sometimes tinged with rose ; outer lobes obovate, 

 the inner narrower and oblong ; ovary flask-shaped, scabrous above. 



Gravelly slopes, Upper Sonoran and Arid Transition Zones; southern Oregon to southern California. Type 

 locality: California, collected by Fremont. June-Oct. 



46. Eriogonum gracile Benth. Slender Woolly Eriogonum. Fig. 1394. 



Eriogonum gracile Benth. Bot. Sulph. 46. 1844. 



Eriogonum acetoselloides Torr. ex Benth. in DC. Prod. 14: 16. 1857. 



Eriogonum leucocladon Benth. PI. Hartw. 333. 1857. 



Eriogonum agninum Greene, Pittonia 2: 165. 1891. 



Eriogonum vimineum subsp. gracile Stokes, Gen. Eriog. 51. 1936. 



Annual, the stems floccose-tomentose throughout, more or less diffusely branched from or 

 near the base, 2-5 dm. high, the branchlets ascending, slender, giving a broom-like effect. Leaves 

 floccose-tomentose on both sides, the basal with slender petioles as long or longer than the oblan- 

 ceolate or broadly oblong blades, solitary or few on the lower nodes and short-petioled or sub- 

 sessile; bracts of the lower nodes often foliaceous, those of the upper branchlets triangular- 

 subulate, about equaling the involucres ; involucres 1 . 5-2 mm. long, tomentose in the sinuses, other- 

 wise glabrous, the teeth rigid, 1 . 5 mm. long, acute ; flowers few, white or pale rose ; calyx glabrous 

 without, the outer lobes broadly rounded at the apex, abruptly narrowed below, the inner oblong- 

 obovate. 



Sandy soil of the valleys and foothills, Sonoran Zones; Sacramento Valley and Inner Coast Ranges, Cali- 

 fornia, to northern Lower California. A variable species, some forms have none of the bracts foliaceous. Type 

 locality: San Pedro, California. July-Oct. 



47. Eriogonum citharaeforme S. Wats. Cithara Eriogonum. Fig. 1395. 



Eriogonum citharaeforme S. Wats. Proc. Amer. Acad. 23: 266. 1888. 



Annual, the stems branched from the base, procumbent or ascending, 2-3-plurichotomous, 

 2-3 dm. long, glabrous. Leaves all basal, or usually one or two at the first node, the blades rounded 

 to oblong-lanceolate, 1-2 cm. long, abruptly or more gradually narrowed to the winged petiole, 

 the blade and wing of the petiole crisped on the margins ; bracts scarious, triangular-subulate, 



