ONAGRACEiB 



95 



1. (E. biennis, L. Common Evening Primrose. 



Biennial, producing a strong root and a large rosette of leaves the first 

 year; stout, erect, 2-4 ft. high, usually simple, somewhat pubescent with 

 spreading hairs; leaves lanceolate to oblong; flowers 

 large, yellow, erect, closing in the hot sun; lobes' of 

 the stigma linear. Open ground, common, Man.-Alta. 



2. QE. pallida, Lindl. White-stemmed Evening 

 Primrose. 



Erect, simple or branched, 1-3 ft. high; stem 

 white, often with shreddy bark; leaves linear to 

 oblong, mostly sessile; flowers large, axillary, white, 

 turning pink. ((B. albicaulia.) Dry prairies, Man.- 

 Alta. 



3. (E. traoba, Nutt. 

 Perennial, glabrous, stemless or nearly so; leaves 



pinnatifid or sinuate-toothed, petioled; flowers white 

 or pink, the petals often 3-lobed; pod short. Clay 

 soil, S. W. Man. and S. Sask. 



4. (E. casspitSsa, Nutt. 



Stemless perennial from woody root ; leaves oval to 

 oblanceolate, tapering to a, slender petiole, often 

 densely pubescent, more or less pinnatifid but not 

 deeply "cut; flowers white, the petals broad and ob- 

 cordate. Dry hills, Sask. and Alta. 



Fig. 69.— Ollnothera 

 biennis (Fruit). 



5. CE. serrulata, Nutt. 



Slender, erect or ascending, simple or branched, 6-18 in. high, mostly 

 glabrous, but canescent on the younger parts; leaves linear to lanceolate, 

 sharply but shallowly dentate or denticulate; calyx tube funnel-form, often 

 silvery-canescent; petals yellow, broadly obovate; stigma scarcely lobed 

 Dry slopes, Man.-Alta. 



3. GAURA. 



Calyx tube much prolonged, deciduous, 4-lobed, the lobes reflexed; 

 petals 4, clawed, rose-eolored; stamens 8, often turned down; 

 style long, slender, deflexed; stigma 4-lobed, surrounded by a sort 

 of ring; fruit hard, 1-celled, 1-4-seeded; flowers rather small, in 

 spikes or racemes. 



1. G. coccfnea, Pursh. 



Ascending, 4-12 in. high, usually canescent; leaves linear to lanceolate; 

 flowers rose-colored turning red, in simple spikes. Gravelly banks, Man.- 

 Alta. 



