Arbeiten, die sich auf einzelne Familien beziehen. 3ßi 



XX Little branched; leaves acute, sharply toothed, glabrate E. 

 Fendleri. 

 oo Leaves broader, elliptical to oväte-lanceolate. 



X Sharply toothed; flower-buds crisp-pubescent. 



§ Southwestern; leaves elliptical, obtuse E. Novo-Mexi- 



canum. 

 §§ Northwestern and Pacific; leaves ovate- to triangular- 

 lanceolate; pubescence chiefly glandulär E. adenocaulon. 

 §§§ Alaskan; leaves broadly lanceolate, acute; pubescence crisp 

 E. boreale. 

 XX Less deeply and sharply toothed; petioles frequently very 

 short in the first. 

 § Pubescence fine, short-glandular (or in some forms somewhat 

 crisp) E. adenocaulon. 

 §§ Pubescence not glandulär, somewhat divergent above in 

 the second. 



-t- Finally much branched; lower leaves obtuse; pubes- 

 cence short and subtomentose on flower-buds E. 

 Parishii. 

 h- -f- Little branched; leaves acute, thin and elongated; 

 pubescence of buds coarse, somewhat spreading E. 

 Californicum. 

 S. Turioniferous plants only exceptionally branchiug, not glaucous. 



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

 ** Leaves frequently petioled, ample. 



f Alaskan; branching, leafy; leaves serrate, drying dark E. boreale. 

 ff Of the Columbia region; simple, less leafy; leaves low-denticulate, light 

 green E. delicatum. 

 *** Leaves sessile (or subpetioled in saximontanum if looked for here, and 

 as to occasional leaves of brevistylum). 

 f Some leaves clasping-decurrent; stem mostly simple; seeds obtuse below, 



gradually tapering above into a broad pale beak E. Halleanum. 

 ff Leaves not decurrent; seeds acute below, more abruptly short-beaked. 

 o Leaves medium sized; petals about 5 mm; seeds rather acute 

 at top. 



X Pubescence long and spreading below E. ursinum. 

 XX Pubescence not pilose. 



§ Leaves narrow, typically erect, acute E. Drummondii. 

 §§ Leaves o vate-lanceolate, acute ; stem very crisp-pubescent 

 above: young E. boreale. 

 §§§ Leaves ovate, more obtuse, drying pale; pubescence 

 scanty E. brevistylum. 

 oo Leaves ample, broadly ovate, the upper often exceeding the 

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

 top E. glandülosum. 

 s. Soboliferous, ascending at base, at length often cespitose or with sterile basal 

 shoots. 

 * Glaucous, without pubescent lines; leaves subsessile: broad-leaved E. 



glaberrimum and its var. latifolium. 

 ** Not glaucous, crisp-pubescent in lines; leaves evidently petioled, rather 

 thin E. Hornemanni. 

 £. Stoloniferous, ascending at base, quite cespitose; leaves small for the group, 

 often nearly sessile, firm E. clavatum. 



