POL YG ON A CEA E. 353 



apex; filaments sparingly villous near the base; achenes I mm. long. On dry 

 plains or hillsides, Neb. and Colo. Summer. 



8. Eriogonum lachnogynum Torr. Long-rooted Eriogonum. (I. F. f. 

 1296.) Scapose perennial. Stems short, often tufted, clothed with the dilated 

 petiole-bases; leaves numerous, crowded, lanceolate to narrowly oblong, 1.5-3 cm - 

 long, silky above, white tomentose beneath, somewhat revolute; scapes erect, 1-3 

 dm. tall, tomentose, branching into a dichotomous cyme above; involucres broadly 

 campanulate or nearly hemispheric, 3-4 mm. high, commonly sessile, 5 -toothed; 

 bracts scale-like ; calyx 3 mm. long, densely silky-villous ; filament villous at the 

 base; achenes about 2 mm. long, covered by a mass of cottony hairs. On dry plains 

 and prairies, Kans. to Colo, and Ariz. Spring to fall. 



9. Eriogonum annuum Nutt Annual Eriogonum. (I. F. 1. 1290.) 

 Annual, caulescent white floccose- tomentose. Stems erect, 3-9 dm. tall; leaves 

 narrowly oblong or oblanceolate, 2-7 cm. long, sometimes revolute or crisped; ped- 

 uncles shorter than the stems, topped by dichotomous cymes; involucres turbinate 

 or turbinate-campanulate, 2-3 mm. high, secund, short-stalked ; calyx white or 

 pink, 1-2 mm. long, glabrous, the outer segments obovate, the inner narrower, all 

 truncate or retuse; achenes 1.5 mm. long, with a globular base and smooth-angled 

 beak about as long as the base. On dry plains and prairies, Neb. to Tex., N. Mex. 

 and Mex. July to Sept. 



10. Eriogonum campanulatum Nutt. Narrow-leaved Eriogonum. (I. F. 

 f. 1297.) Perennial from a woody base. Stems branched, more or less tomentose; 

 leaves crowded on short branches, narrowly oblanceolate or linear, 2-8 cm. long, 

 obtuse, sometimes revolute, narrowed into petioles; peduncles erect or nearly so, 

 1-3 dm. tall, glabrous, topped by often trichotomous cymes; involucres oblong- 

 turbinate, 2-3 mm. high, with five obtuse teeth ; bracts scale-like ; calyx yellow, 

 1.5-2 mm. long, the segments often becoming fiddle- shaped, retuse or emarginate; 

 filaments villous below the middle; achenes 3 mm. long, pitted, enlarged at the 

 base. In dry soil, Neb. to Ore., south to Utah and N. Mex. Summer and fall. 



11. Eriogonum corymbosum Benth. Crisp-leaved Eriogonum. (I. F. 

 f. 1292.) Perennial, caulescent, densely floccose-tomentose. Stem erect, branched, 

 3-6 dm. tall; leaves oblong or oval, 1-4 cm. long, obtuse, more or less crisped, 

 narrowed at the base; peduncles terminating leafy branches, 1-10 cm. long, topped 

 by a trichotomous cyme; involucres campanulate, sessile, 2-4 mm. long, 5-toothed; 

 calyx 2-4 mm. long, white or pinkish, glabrous, the outer segments broadened 

 upward, rounded or notched at the apex, broader and longer than the inner; 

 filaments woolly below; achenes about 2 mm. long, with a rounded base and rough 

 angles especially on the beak. In dry soil, Neb. and Kans. to Utah, south to 

 N. Mex. and Ariz. Aug. -Sept. 



12. Eriogonum microthecum Nutt. Slender Eriogonum. (I. F. f. 1291.) 

 Shrubby, more or less floccose-tomentose, 1-3 dm. tall. Stems diffusely branched 

 below, the branches spreading or ascending ; leaves oblanceolate, spatulate or nar- 

 rowly oblong, 1-2 cm. long, flat or revolute, with short petioles ; peduncles erect, 

 3-10 cm. long, topped by small twice or thrice compound corymbose cymes; bracts 

 scale-like; involucres narrowly campanulate, 2 mm. high ; the teeth acutish; 

 calyx glabrous, white or pink, sometimes tinged with red, 2.5-3 mm - l° n g> tne 

 outer segments obovate or oval-obovate, the inner smaller, inclined to be oblong ; 

 filaments villous; achenes 2-2.5 mm. long, swollen at the base. On dry plains 

 or prairies, S. Dak. to Wash., south to Tex. and Calif. Summer and fall. 



13. Eriogonum effusum Nutt. Effuse Eriogonum. Shrubby, 2-4 dm. 

 tall, white floccose-tomentose. Stems stout, diffusely branched; leaves linear or 

 narrowly oblong, 1-4 cm. long, revolute; peduncles 2-10 cm. long, topped by 5-7 

 times compound stiff corymbose cymes ; bracts scale-like ; involucres narrowly 

 campanulate, 2-2.5 mm. high, the tube slightly angled, the teeth rather obtuse; 

 calyx 2 mm. high, white, glabrous, the outer segments cuneate obovate, rounded 

 at the apex, the inner notched; filaments villous, especially below the middle; 

 achenes 3-angled. On dry plains or prairies, S. Dak. and Neb. to Wyo., south to 

 N. Mex. Summer. 



14. Eriogonum cernuum Nutt. Nodding Eriogonum. (I. F. f. 1298.) 

 Annual, nearly acaulescent, often diffuse. Leaves basal, the blades suborbicular 

 to oval, 1-2 cm. long, obtuse or sliehtlv apiculate, floccose-tomentose; the petioles 



