ONAGRACEAE. 171 



Epilobium paniculatum Nutt. Annual, glabrous or minutely pubescent, 

 much-branched above, 30-60 cm. high; bark becoming loose and papery at 

 base; leaves linear or linear-lanceolate, often curved and folded, acute, dentic- 

 ulate, 2-5 cm. long, attenuate to a short petiole; flowers pink or whitish, 

 variable in size, usually 4-10 mm. broad, in loose racemes terminating the 

 almost naked branches; petals notched; capsules lanceolate-linear, 1-1.5 cm. 

 long, on pedicels about as long. Common and variable. 



Epilobium franciscanum Barbey. Very similar to E. adenocaulon, but 

 canescent-puberulent throughout or somewhat pilose above; leaves mostly 

 sessile. In moist places near Spokane, Piper. 



Epilobium adenocaulon Haussk. Perennial by short stolons which produce 

 fleshy rosettes in the fall; stems erect, 30-60 cm. high, usually simple, leafy, 

 glabrous or puberulent, sometimes glandular above; leaves mostly opposite, 

 lanceolate, acutish, closely denticulate, glabrous or puberulent, 5-7 cm. long, 

 mostly short petioled; inflorescence terminal, becoming loose; petals notched, 

 about 4 mm. long, pink; capsules linear, nearly sessile, 6-8 cm. long, usually 

 puberulent; seeds minutely papillate. Low ground, common. Very variable. 



Epilobium adenocaulon occidentale Trel. Remotely leafy; leaves more 

 triangular-lanceolate, erect, prominently denticulate, very short-petioled. 

 Pullman and Spokane. 



Epilobium hornemanni Reichenb. Perennial, often tufted, 10-30 cm. high, 

 erect, usually puberulent or glandular in the inflorescence; leaves ovate, entire 

 or denticulate, 2-4 cm. long, narrowed at base to a short petiole; petals pink 

 or purple, 5-8 mm. long; capsule pedicellate; seeds smooth or minutely rough- 

 ened. Along rills in the Blue Mountains. 



Epilobium fastigiatum (Nutt.) Piper. Perennial, glabrous and glaucous, 

 usually tufted, the stems mostly simple, 10-20 cm. high; leaves sessile, all 

 opposite, ovate or ovate-lanceolate, serrulate, or nearly entire, 1-2 cm. long; 

 petals usually pink, 4-8 mm. long; stigma clavate; capsules 6-7 cm. long; 

 seeds minutely roughened. Moist places, Blue Mountains. 



Epilobium ursinum Parish. Stems slender, erect, 15-30 cm. high; herbage 

 sparsely pubescent or somewhat pilose, the inflorescence minutely glandular- 

 pubescent; leaves lanceolate, sessile, denticulate-serrate, acutish, 2-3 cm. 

 long, a little longer than the internodes; flowers few; petals white or lavender, 

 about 5 mm. long; capsules ascending, glabrous, 3 cm. long, on pedicels half 

 as long; seeds rough. Little Potlatch River, Idaho, Sandberg, Heller and 

 MacDougal. 



243. CLARKIA. 



Annual, with erect brittle stems; leaves alternate or opposite, 

 on short slender petioles, the uppermost sessile; flowers in ter- 

 minal racemes; calyx-tube obconical above the ovary, 4-cleft; 

 petals 4, with claws, lobed or entire, purple or violet; stamens 8, 

 those opposite the petals often sterile; anthers attached at their 

 bases, erect; ovary 4-celled; capsule linear, attenuate above, 

 coriaceous, erect, somewhat 4-angled, 4-celled and 4-valved to 

 the middle; seeds numerous. 



Petals 3-lobed. C. pulchella. 



Petals entire. C. rhomboidea. 



Clarkia pulchella Pursh. Stems erect, much branched above, 15-60 cm. 

 high, puberulent; leaves linear or linear-lanceolate, entire, rather obtuse, 



