24 POLYGONACEAE 



the tube, reflexed ; calyx yellow, densely villous tomentose, 4-5 mm. long ; filaments pilose below ; 

 achenes pubescent at apex. 



Gravelly soils, Upper Sonoran and Arid Transition Zones; Lake and Mariposa Counties, California. Type 

 locality: Hough's Springs, Lake County, California. May- Aug. 



6. Eriogonum thymoides Benth. Thyme-leaved Eriogonum. Fig. 1354. 



Eriogonum thymoides Benth. in DC. Prod. 14: 9. 1856. 



Eriogonum thymoides subsp. congestum Stokes, Gen. Eriog. 102. 1936. 



Caudex much branched, cespitose, from a stout root clothed with shredded bark. Leaves tufted 

 at the end of the branches, linear, 4-16 mm. long, densely white-tomentose beneath, cinereous 

 above, the margins becoming strongly revolute ; flowering stems slender, 2-6 cm. high, appressed- 

 pubescent, bearing a whorl of foliaceous bracts near the middle; involucre solitary, turbinate, 

 5 mm. long, short-villous, the teeth ovate, only slightly spreading; calyx cream yellow, often 

 turning deep rose, densely white-villous without, stipe-like base very short; filaments villous 

 below ; achene pubescent above on the angles. 



Dry sterile soil in sagebrush, Upper Sonoran Zone; eastern Washington and northeastern Oregon to Idaho. 

 Type locality: on the Spokane River, Washington. April-June. 



7. Eriogonum Piperi Greene. Piper's Eriogonum. Fig. 1355. 



Eriogonum Piperi Greene, Pittonia 3: 263. 1898. 



Eriogonum flavum subsp. Piperi Stokes, Gen. Eriog. 117. 1936. 



Caudex with short woody branches clothed with the persistent petioles. Leaves oblanceolate, 

 3-10 cm. long, the petiole slender, longer than the blade, white-tomentose beneath, green and 

 thinly villous above; flowering stems scapiform, 10-30 cm. high, villous; bracts subtending the 

 simple umbel, foliaceous, usually 5 or 6, oblanceolate; rays obscure, 5-20 mm. long; involucre 

 obconic, 6-8 mm. long, shallowly undulate-dentate ; calyx yellow, conspicuously villous without, 

 stipe-like base 1-1.5 mm. long; filaments hairy below; achenes pubescent above. 



Alpine slopes and ridges, Hudsonian Zone; Blue and Wallowa Mountains, southeastern Washington, and 

 adjacent Oregon to western Montana and Wyoming. Type locality : Blue Mountains, Washington. July-Aug. 



8. Eriogonum pyrolaefolium Hook. Pyrola-leaved Eriogonum. Fig. 1356. 



Eriogonum pyrolaefolium Hook. Kew Journ. Bot. 5: 395. pi. 10. 1853. 



Eriogonum pyrolaefolium var. coryphaeum Torr. & Gray, Proc. Amer. Acad. 8: 162. 1870. 



Caudex simple or few-branched arising from a deep-seated root, clothed with the old leaf 

 bases. Leaves ovate to suborbicular, 1-3 cm. long, thickened, villous-pubescent throughout or 

 glabrous except the petioles and base of blades ; flowering stem scape-like, 4-7 cm. high, slender, 

 villous or glabrous ; bracts 2, linear, subtending the small umbel ; rays simple, usually 1-3, 1-6 mm. 

 long ; involucres narrowly turbinate, the teeth oblong, not reflexed ; calyx rose-colored, 4-5 mm. 

 long, villous-pubescent, narrowed to a very short obscure stipe-like base ; filaments glabrous ; 

 achenes pubescent on the angles to near the base. 



Gravelly or sandy slopes, Hudsonian Zone; high volcanic peaks from Mount Stuart, Washington, to Mount 

 Lassen, California. The Mount Shasta and Mount Lassen plants are nearly glabrous, while the plants from 

 Crater Lake northward are villous-pubescent throughout (var. coryphaeum). Type locality: Mount Shasta, Cali- 

 fornia. Aug.— Sept. 



9. Eriogonum latens Jepson. Onion-flowered Eriogonum. Fig. 1357. 



Eriogonum latens Jepson, Fl. Calif. 427. 1914. 

 Eriogonum monticola Stokes, Gen. Eriog. 123. 1936. 



Caudex with short cespitose branches. Leaves short-pilose, the blades elliptic-obovate to del- 

 toid-ovate, 15—25 mm. long, apiculate at apex, narrowed abruptly or gradually to a winged petiole 

 of about the same length or longer ; flowering stems scape-like ; bracts subtending the inflorescence 

 membranous, rose-colored ; involucres few, sessile or subsessile, forming a head, campanulate, 

 conspicuously membranous, 6-8 mm. long, sparsely pilose, the lobes oblong-ovate, becoming 

 recurved ; calyx cream-colored, pubescent below, without an evident stipe-like base, the lobes 

 obloncr-obovate ; filaments hairy below ; achene glabrous. 



Talus slopes, Arid Transition and Canadian Zones; eastern slopes of Sierra Nevada and White Mountains, 

 Inyo County, California, and adjacent Nevada. Type locality: Timosea Peak, altitude 6500 feet, Inyo County, 

 California. July-Sept. The scarious rose-colored bracts and involucres suggest some of the wild onions. 



10. Eriogonum Kelloggii A. Gray. Kellogg's Eriogonum. Fig. 1358. 



Eriogonum Kelloggii A. Gray, Proc. Amer. Acad. 8: 293. 1870. 



Caudex cespitose forming low dense or loose mats, young branchlets loosely tomentose. 

 Leaves oblanceolate to spatulate, narrowed to a short simple petiole, 1-3 mm. wide, silky-tomen- 

 tose on both sides, sometimes less so above ; flowering stem slender, 3 . 5-7 cm. long, bearing a 

 whorl of foliaceous bracts at the middle ; involucre solitary, narrowly turbinate, 5-6 mm. high, 

 silky-tomentose, the teeth short, erect ; calyx 4 mm. long in fruit, tinged with rose, glabrous ; 

 filaments 3 mm. long, hairy at base ; achene conical, glabrous except at base of the styles, these 

 3 mm. lone r . 



Dry ridges, Humid Transition and Canadian Zones; Red Mountain, northern Mendocino County, California. 

 Type locality: fir woods. Red Mountain, Mendocino County, California. July-Aug. 



