54 Systematik und Pflanzengeographie. 



Leaves crowded above; flowers hardly surpassing the uppermost 

 leaves; glandulär pubescence course and dingy above. 



E. Franciscanum. 

 (Young glandulosum and boreale might be souglothere.) 

 Leaves more remote ; flowers conspicuously protruding, pubescence 

 fine, sometimes incurved. E. adenocaulon var. occidentale. 



Flowers smaller, the petals 3 to 5 mm long. 



Seeds occidental, beakless, 1,5 mm long: coma reddish, leaves lanceo- 

 late, acute, sharply serrulate. E. coloratum. 



Seeds nearly ellipsoidal, about 1 mm long, short beaked at summit ; 

 coma white or pale. 



Leaves narrowly lanceolate. 



Much branched ; leaves often obtuse, not deeply serrulate, at 

 least uppermost and the twics silky. E. holosericeum. 



Little branched: leaves acute, sharply toothed, glabrate. 



E. Fendleri.. 

 Leaves broader, elliptical to ovate-lanceolate. 

 Sharply toothed, flower buds crisp-pubescent. 



Southwestern, leaves elliptical, obtuse. E. Novo-mexicanum. 

 Northwestern and Pacißc, leaves ovate to triangular-lanceo- 

 late, pubescence chiefly glaudular. E. adenocaulon. 



Alaskan, leaves broadly lanceolate, acute pubescence crisp. 



E. boreale. 

 Less deeply and sharply toothed, petioles frequently very short 

 in the first. 



Pubescence fine, short-glandular (or in some somewhat crisp). 



E. adenocaulon. 

 Pubescence not glandulär, somewhat divergent above in the 

 second. 



Finally much branched, lower leaves obtuse, pubescence 

 short and subtomentose on flower buds. E. Parishii. 



Little branched, leaves acute, thin and elongated, pubescence 

 of buds course, somewhat 2 preading. E. Californicum. 



Turioniferous plants only exceptionally branching, not glaucous. 

 Leaves petioled, small and spreading. E. leptocarpum var. Macounii. 

 Leaves frequently petioled, ample. 



Alaskan, branching, leafy, leaves serrate, drying sack. E. boreale.. 



Of the Columbia Region, simple, less leafy, leaves low-denticu- 



late, light-green. E. delicatum.. 



Leaves sessile (or subpetioled in saximontanum if looked for here 



and as to occasional leaves of brevistylum). 



Some leaves clasping-decurring, stem mostly simple, seeds ob- 

 tuse below, gradually tubering above into a broad pale beak. 



E. Halleanum. 

 Leaves not decurrent, seeds acute below, more abruptly short- 

 beaked. 



Leaves medium-sized, petals about 5 mm, seeds rather acute 

 at top. 



Pubescence long and spreading belowe. E. ursinum. 



Pubescence not pilose. 



Leaves narrow, typically erect ovate. E. Drummondii. 



Leaves ovate-lanceolate, acute, stem very crisp. pubes- 



cent above. young E. boreale. 



Leaves ovate , more obtuse , dryins pale, pubescence 



scanty. E. brevistylum. 



Leaves ample. broadly ovate, the upper often exceeding the 



inflorescence, drying dark, petals about 7 mm, seeds obtuse 



at top. E. glandulosum. 



Soboliferous, ascending at base, at length often cespitose or with 



sterile basal shoots. 



Glaucous, without pubescent lines, leaves subsessile, . . . broad- 

 leaved E. glaberrimum and var. latifolium. 



