26 POLYGONACEAE 



11. Eriogonum siskiyouense Small. Siskiyou Eriogonum. Fig. 1359. 



Eriogonum siskiyouense Small, Bull. Torrey Club 25: 44. 1898. 

 Eriogonum ursinum var. siskiyouense Stokes, Gen. Eriog. 114. 1936. 



Cespitose perennial with short compact branches, forming low tufts or mats. Leaves 5-8 mm. 

 long, oval to spatulate, acute or acutish, narrowed to a short petiole, glabrate above, tomentose 

 beneath ; scapes slender, 4-8 cm. high, with a whorl of 2-4 foliaceous bracts near the middle ; 

 involucre solitary, sparsely arachnoid-tomentose, campanulate, the tube 3.5-4 mm. long, the lobes 

 reflexed, about as long as the tube ; calyx yellow, glabrous, 5 mm. long, contracted to a short stipe- 

 like base ; filaments hairy at base ; achene glabrous. 



Mountain ridges, Boreal Zones; Siskiyou and Trinity Counties, California. Type locality: Scott Mountain, 

 altitude 9,000 feet, Siskiyou County, California. Aug.-Sept. 



12. Eriogonum incanum Torr. & Gray. Hoary Eriogonum. Fig. 1360. 



Eriogonum incanum Torr. & Gray, Proc. Amer. Acad. 8: 161. 1870. 



Caudex densely cespitose, forming mats, the young branchlets tomentose. Leaves densely 

 hoary-tomentose on both surfaces, oblong or spatulate, 5-15 mm. long, obtuse at the apex, nar- 

 rowed at base to a petiole of about equal length ; flowering stem scapiform ; bracts subtending the 

 umbels lanceolate-subulate, 4-5 mm. long ; umbel small, often subcapitate, the central involucre 

 sessile, the outer on rays 2-12 mm. long or sometimes congested into a head ; involucres broadly 

 turbinate, 3 mm. high, the teeth ovate-triangular, erect or in age somewhat spreading ; flowers 

 polygamo-dioecious ; calyx glabrous, pale lemon yellow, in the fertile flowers enlarged in fruit, 

 usually tinged with red and bearing very short and sterile stamens, in the sterile ones remaining 

 small (3 mm.), and bearing fertile stamens; filaments villous below; achene tomentulose at apex 

 or usually glabrous; styles less than 0.5 mm. long, erect. 



Rocky alpine ridges, Canadian and Hudsonian Zones; Sierra Nevada, from Lake Tahoe to Mount Whitney. 

 Type locality: Tuolumne River, altitude 8,000-11,000 feet, Sierra Nevada, California. July-Sept. 



13. Eriogonum marifolium Torr. & Gray. Marum-leaved Eriogonum. Fig. 1361. 



Eriogonum marifolium Torr. & Gray, Proc. Amer. Acad. 8: 161. 1870. 

 Eriogonum cupulatum Stokes, Leaflets West. Bot. 1: 34. 1933. 



Caudex much branched, forming loose mats, the young branchlets tomentose. Leaves oblong- 

 ovate to broadly ovate, cuneate to nearly truncate at base, densely tomentose beneath, glabrate 

 above, 8-15 mm. long, petiole of about equal length; flowering stem scapiform, sparsely tomen- 

 tose ; 5-20 cm. high ; bracts subtending the umbel linear-subulate, 3-8 mm. long ; central ray often 

 sessile or at least shorter than the others, lateral rays several, short, forming congested umbel in 

 anthesis, elongated, often 2-3 cm., in fruit; involucre 2.5 mm. long, the teeth short and broad; 

 calyx lemon yellow, often tinged with red along median line in age, becoming 3-4 mm. long ; fila- 

 ments 1 mm. long, hairy below ; achene glabrous, conical ; styles scarcely 0.5 mm. long, nearly erect. 



Sandy and gravelly slopes, Boreal Zones; Cascade Mountains, central Oregon, to the central Sierra Nevada, 

 California. Type locality: Mount Shasta, California. June-Sept. This species is dioecious, the pistillate plants 

 having longer peduncles, and a brighter yellow and larger calyx. 



14. Eriogonum ursinum S. Wats. Bear Valley Eriogonum. Fig. 1362. 



Eriogonum ursinum S. Wats. Proc. Amer. Acad. 10: 347. 1875. 



Caudex woody, short-branched and cespitose. Leaves ovate, 8-10 mm. long, abruptly nar- 

 rowed to a short petiole, densely white-tomentose beneath, sparsely tomentose and often becoming 

 glabrate above, obtuse or commonly acute at apex and slightly apiculate ; flowering stems stout, 

 20-40 cm. high, villous-tomentose ; bracts foliaceous, subtending the compressed umbels, with 

 smaller more slender ones subtending the forks ; involucres sometimes crowded into a simple 

 head-like umbel, villous, the teeth short and dentate ; calyx ochroleucous, glabrous without, vil- 

 lous within, the stipe-like base about 1 mm. long; filaments densely woolly-villous; achene gla- 

 brous or very sparsely pubescent at apex; styles 2.5-3 mm. long, very sparsely short-pubescent at 

 base or glabrous. 



Rocky ledges, Canadian Zone; northern Sierra Nevada, California. Type locality: Long and Bear Valleys, 

 Plumas County, California. June— Sept. 



15. Eriogonum ternatum Howell. Waldo Eriogonum. Fig. 1363. 



Eriogonum ternatum Howell, Fl. N.W. Amer. 570. 1902. 

 Eriogonum ursinum var. confine Stokes, Gen. Eriog. 114. 1936. 



Caudex woody, cespitose, clothed with the old leaf bases. Leaves obovate to spatulate or 

 oblong, obtuse, 10—15 mm. long, narrowed to slightly winged petioles about as long or longer than 

 the blades, densely white-tomentose beneath, less so above, or in age a few glabrate; flowering 

 stem 10-30 cm. high, scape-like, tomentose ; bracts 4 or 5, foliaceous, subtending the 3-4 rays, the 

 lateral rays with 3-4 small bracts subtending the involucres; involucres funnel form, 6-7 mm. 

 high, white-tomentose, the teeth ovate-triangular, about 2 mm. long ; calyx sulphur yellow, gla- 

 brous without and within; filaments densely woolly-villous below, 3.5 mm. long; achenes sparsely 

 pilose above on the angles ; styles 3-3 . 5 mm. long, villous below. 



Gravelly and rocky soils, Arid Transition Zone; Josephine County, Oregon, and adjacent Del Norte and 

 Siskiyou Counties, California. Type locality: "On gravelly bars along streams near Waldo, Southern Oregon." 

 June-Aug. 



