ONAGRACE^E. 83 



petioles. Flowers erect. Coma of the seed much lighter in 

 colour. Common in wet places. 



3. <ENOTHE'RA, L. EVENING PRIMROSE. 



* Stigma-lobes linear. 



1. (E. bieh'nis, L. (COMMON EVENING PRIMROSE.) Stem 

 2-4 feet high, hairy. Leaves ovate-lanceolate. Flowers 

 yellow, odorous, in a leafy spike, opening in the evening or 

 in cloudy weather. Pods oblong, narrowing towards the 

 top. Waste places. 



Var. grandiflo'ra, Lindl., has petals as long as the 

 calyx- tube. 



Var. muriea'ta, Lindl. has rough-bristly stem and pods, 

 and potals rather longer than the stamens. 



2. (E. albieau'liS, Nutt. Flowers white, changing to 

 rose-colour, nodding in the bud. Stem white, and common- 

 ly glabrous. N. W. 



3. (E. pu'mila, L. (SMALL E.) Stem low, 5-12 inches high, 

 smooth or nearly so. Leaves lanceolate or oblanceolate. 

 Pods nearly sessile, club-shaped, 4-angled. Flowers pale 

 yellow, opening in sunshine. River and lake margins. 



4. (E. ehrysan'tha, Michx. Distinguished from the pre- 

 ceding by the orange-yellow flowers, and pedicelled pods, the 

 latter scarcely wing-angled. Drier ground than the pre- 

 ceding. 



* * Stigma discoid. 



5. (E. serrula'ta, Nutt., var. Douglasii, Torr. and Gray. 

 A low and slender plant, with linear to lanceolate leaves. 

 Calyx-tube broadly funnel-form. Petals obovate. N.W. 



4. . U K A, L. 



G. COeein'ea, Nutt. Hoary and very leafy, 6-12 inches 

 high. Flowers small, in simple spikes. N. W. 



5. LUDWIG'IA, L. FALSE LOOSESTRIFE. 



1. L. palustris, Ell. (WATER PURSLANE.) Stems creep- 

 ing in the mud of ditches or river margins, smooth. Leaves 

 opposite, tapering into a slender petiole. Flowers sessile, 

 solitary, usually without'petals. Pod 4-sided. 



