Arbeiten, die sich auf einzelne Familien beziehen. 359 



** Flowers less open; plants tall, dichotomous or panicled; leaves elongated 

 E. paniculatum and var. iueundum. 

 E. exaltatum (cf. adenocaulon) , E. Oreganum (cf. glaberrimuni) and another 

 supposed hybrid, which is mentioned under Hornemanni, would be looked for under A, 

 because of their stigmatic characters. 



B. Stigma entire or only notehed; flowers never yellow. 

 1. Seeds not prominentely papillate, mostly smooth. 



a. Seeds broadly obovoid, very blunt; coma easily falling; leaves subpetioled, narrow, 

 acute. 

 a. Glabrous or glandulär, dichotomous; leaves mostly veined, ofted ineurved or 



folded along the midrib; seeds very large (1:2 mm) E. paniculatum. 

 ß. Crisp-pubescent, simple 01* panicled; leaves mostly veinless; seeds half as 

 large E. minutum. 



b. Seeds fusiform; coma more persistent. 

 a. Leaves minutely revolute : smoother seeded forms of the group of E. palustre. 

 ß. Leaves not revolute; stein simple or few branched below. 



* Leaves rather ample, ovate to elliptical, some of them usually toothed. (E. 

 glandulosum, with seed papillae collapsed, might be sought here.) 

 f Glandular-pubescent; leaves sessile, some of them broadly decurrent; 

 seeds very long, blunt at base, tapering above into a broad pale apex 

 E. Halleanum. 

 ff Crisp-pubescent in lines; leaves not decurrent; seeds shorter, more 

 acute below, with narrower sometimes very short aud abrupt beak. 

 Alaskan species with rosy flowers. 



X Erect; leaves elliptical, tapering to each end, petioled; flowers 

 nodding E. Bongardi. 

 XX Ascending at base; leaves ovate, the upper sessile; flowers 

 erect E. Behringianum. 

 00 Exteuding southward in the mountains; stems ascending at base; 

 leaves petioled. 



X Flowers violet, medium sized; leaves dark green or purple; 

 seeds blunt above: exceptionnally smooth-seeded plants of 

 E. Hornemanni. 

 XX Flowers white, very small; leaves thin, light green; seeds 

 (seen from in front) gradually attenuated to the beak E. 

 alpinum. 

 ** Leaves quite small, usually nearly entire. 



f Stem ascending or almost creeping, often S-shaped, cespitose; leaves 

 relatively broad and spreading, uniformly distributed E. anagallidifolium. 

 ff Stem erect, not cespitose; leaves strict, the uppermost remote and 

 linear E. Oregonense. 

 2. Seeds papillately roughened under the microscope. 



a. Leaves linear to lanceolate, nearly entire, generally without conspieuous 

 lateral veins. 



a. Leaves slightly revolute; sobols filiform, at length ending in large turions; 

 seeds large, elongated. 



* Simple or nearly so, crisp-pubescent; leaves sessile, usually obtuse E. 

 palustre. 



** Mostly branched above; leaves more acute. 



f Crisp-pubescent; leaves very narrow, petioled E. lineare. 

 ff Softly white-glandular; leaves lanceolate, sessile E. strictum. 

 ß. Leaves not revolute, sometimes involute in paniculatum. 



* Innovations and seeds as in the last group: hybrids of E. palustre. 

 ** Innovations various, never filiform. 



