42 POLYGONACEAE 



45°-60° ; bracts of the lowermost node linear, 4-5 cm. long, the upper triangular-subulate; invo- 

 lucres solitary or sometimes 2 at a node, axillary and terminal, 3-4 mm. long, narrowly turbinate, 

 deeply 5-toothed, villous-ciliate on the margins of the teeth especially in the sinuses, otherwise 

 glabrous, or rarely sparsely villous; calyx cream white or rose-tinged, glabrous without, 2.5-3 

 mm. long ; the lobes all similar, oval ; filaments villous at base. 



Dry slopes and cliffs, mainly Arid Transition Zone; Blue Mountains of Washington and Oregon. Type 

 locality : Blue Mountains. June-Aug. 



60. Eriogonum racemosum Nutt. Racemose Eriogonum. Fig. 1408. 



Eriogonum racemosum Nutt. Journ. Acad. Phila. II. 1: 161. 1848. 



Perennial with a woody root and simple or short-branched crown. Basal leaves ovate to ob- 

 long-ovate, rounded to acutish at base, mostly obtuse at apex, 2-4 cm. long, densely white-tomen- 

 tose beneath, less so above, exceeded by the petioles ; flowering stems herbaceous, leafless or the 

 lower nodes with a few short-petioled oblong to rounded leaves, dichotomously branched above, 

 the angle of branching about 45° and the branches elongated; flowering nodes often approximate 

 and the flowers then simulating a raceme ; involucres cylindric, 2 . 5-3 mm. long ; calyx white or 

 tinged with rose, 3 mm. long, glabrous, the lobes oval, becoming oblong-oblanceolate in age ; fila- 

 ments pilose below ; achenes retrorsely scabrous. 



Dry gravelly or rocky desert slopes, Upper Sonoran Zone; Panamint, Providence and New York Mountains, 

 California, east to Colorado and western Texas. Type locality: Colorado of the West. July-Sept. 



61. Eriogonum elongatum Benth. Long-stemmed Eriogonum. Fig. 1409. 



Eriogonum elongatum Benth. Bot. Sulph. 45. 1844. 



Perennial with a branched woody base, 10-20 cm. high, the flowering stems usually several, 

 leafy below, branched above, 4-10 dm. high, their branches few, strict, white-tomentose through- 

 out. Leaves ovate to lanceolate, 2-3 cm. long ; petioles 5-10 mm. long or the lower longer, glabrate 

 above, densely white-tomentose beneath ; involucres distant, oblong-cylindric, 5-7 mm. long, 

 tomentose, obscurely 5-toothed; calyx white or sometimes tinged with rose, glabrous without, 3 

 mm. high, the lobes obovate, obtuse, sparsely hairy on the midvein within ; filaments glabrous. 



Rocky hills and canyon slopes, Upper Sonoran Zone; Coast Ranges from San Benito and Monterey Coun- 

 ties, California, to northern Lower California. Type locality: San Pedro, California. Aug.— Nov. 



62. Eriogonum nodosum Small. Knotty Eriogonum. Fig. 1410. 



Eriogonum nodosum Small, Bull. Torrey Club 25: 49. 1898. 



Low shrub, 5-10 dm. high, rather profusely di- and trichotomously branched, the ultimate 

 branchlets slender, hoary throughout with a dense close tomentum, or the older stems somewhat 

 floccose. Leaves lanceolate-elliptic, acute, 4-15 mm. long, narrowed to a short petiole; involucres 

 racemosely scattered on short divaricate branchlets, turbinate-cylindric, 2-3 mm. long, tomentose ; 

 calyx white or rose-colored, 2-3 mm. long, glabrous, outer lobes oblong-obovate, the inner nar- 

 rower; filaments pilose below the middle; achene minutely scabrous above. 



Dry desert slopes, Lower Sonoran Zone; western borders of the Colorado Desert, southern California. Type 

 locality: Dos Cabesas, California. Aug. -Dec. 



63. Eriogonum microthecum Nutt. Great Basin Buckwheat Brush. Fig. 1411. 



Eriogonum microthecum Nutt. Journ. Acad. Phila. II. 1: 162. 1848. 

 Eriogonum confer tiflorum Benth. in DC. Prod. 14: 17. 1856. 



Low half shrub, 1-3 dm. high, diffusely branched from the base, the bark on the woody 



branches shredded, the younger leaf-bearing branches tomentose. Leaves oblong-oblanceolate to 



elliptic, 7-18 mm. long, short-petioled, often revolute, white-tomentose beneath, glabrate above; 



peduncles 3-10 cm. long, bearing a compound cymose umbel, 2-5 cm. broad ; involucres narrowly 



turbinate, 3 mm. long, those in the axils pedicelled, the others sessile or subsessile ; calyx white or 



yellow, sometimes tinged with rose, 2-3 mm. long, glabrous ; the lobes about as long as the tube, 



the outer rounded, subcordate at base, the inner elliptic. 



Dry sandy or rocky soils, Upper Sonoran and Arid Transition Zones; eastern Washington south, east of 

 the Cascade-Sierra Divide, to southern California, east to Colorado and New Mexico. Type locality: "On the 

 sides of hills, in Oregon, east of Walla Walla." June— Oct. 



64. Eriogonum Plumatella Dur. & Hilg. Plumatella or Flat-top Eriogonum. 



Fig. 1412. 



Eriogonum Plumatella Dur. & Hilg. Pacif. R. Rep. 5: 14. pi. 16. 1855. 

 Eriogonum Palmeri S. Wats. Proc. Amer. Acad. 12: 267. 1879. 



Stems usually several, somewhat woody at base, arising from a stout woody root, 3-6 dm. 

 high, white-tomentose throughout, intricately and strongly divaricate-branched above. Leaves 

 confined to lower part, oblong-lanceolate to oblanceolate, 7-15 mm. long, hoary-tomentose, acute, 

 narrowed at base to a short petiole ; involucres solitary, on the approximate nodes, glabrous, 2-5 

 mm. long ; calyx white, 2 mm. long, glabrous, the outer lobes obovate, the inner narrower ; fila- 

 ments pilose below the middle ; achenes scabrous. 



Rocky ridges, Upper Sonoran Zone; mainly pinon-juniper belt of the Mojave Desert, Walker Pass and 

 desert slopes of the Tehachapi Mountains south to Little San Bernardino Mountains, California, east to ad- 

 jacent Arizona. Type locality: "Pose Creek," Kern County, California. Aug.-Nov. 



Eriogonum Plumatella var. Jaegeri (Munz & Johnston) Stokes ex Munz, Man. S. Calif. 120. 1935. 

 {E. nodosum var. Jaegeri Munz & Johnston, Bull. Torrey Club 40: 350. 1922.) Differs from the typical 

 species in that the flowering branches are glabrous instead of tomentose. Little San Bernardino Mountains, 

 southern California. Type locality: Morongo wash, Riverside County, California. 



