ONAGRACEAE. 



Vol. II. 



10. Epilobium Hornemanni Reichenb. Horne- 

 mann's Willow-herb. Fig. 3036. 



E, Hornemanni Reichenb. Icon. Crit. 2: jt,. 1824. 



E. alpinum var. majus A. Gray, Man. Ed. 5, 177. 1867. 



Erect, 6'-i2' high, simple or nearly so, slightly 

 pubescent above, otherwise glabrous. Leaves short- 

 petioled, ovate or elliptic, acutish or obtuse at the 

 apex, narrowed or rounded at the base, entire or 

 rather remotely denticulate, thin, 6"-2o" long, 4"-io" 

 wide ; flowers few in the upper axils, purple or violet, 

 3"-3i" broad; stigma entire; capsules i'-2i' long, 

 nearly glabrous, slender-pedicelkd ; seeds about i" 

 long, papillose, nearly beakless ; coma dingy-white. 



Moist places, Labrador to Maine, New Hampshire, 

 British Columbia, south in the Rocky Mountains to 

 Colorado and to California. Also in Europe and Asia. 

 Summer. 



7. OENOTHERA L. Sp. PL 346. 1753. 



[Onagra Adans. Fam. PI. 2 ; 85. 1763.] 



Annual or biennial caulescent herbs, with mostly erect stems. Leaves alternate, undulate 

 or toothed, sessile or short-petioled ; buds erect. Flowers yellow, nocturnal, in terminal 

 bracted spikes. Calyx-tube elongated, terete, gradually enlarged at the throat ; calyx-seg- 

 ments narrow, the tips free in the bud. Petals 4, spreading. Stamens 8, equal in length; 

 filaments filiform; anthers linear. Ovary 4-celled ; united styles filiform; stigma 4-cleft; 

 ovules numerous, in 2 or more rows, horizontal. Capsule 4-celled, 4-angled, more or less 

 tapering, opening loculicidally. Seeds prismatic-angled, in 2 or more rows, horizontal. 

 [Greek, wine-scenting, the roots being once used for that purpose.] 



About 15 species, composed of many races, chiefly North American. The later flowers are 

 often much smaller than the earlier ones on the same plant. The generic name Onagra was used 

 for these species in our first edition, but it is properly a synonym of Oenothera. Type species: 

 Oenothera biennis L. 



Flowers small; petals linear, i"-2" broad. • i. O. crucial a. 



Flowers large ; petals Vi'-2' broad. 



Plants and their capsules pubescent. 



Upper bracts shorter than the pods, deciduous. 2. O. biennis. 



Upper brafts as long as or longer than the pods, persistent. 



Puberulent and with long thick-based hairs. 3. O. muricata. 



Densely velvety-pubescent. 4. O. Oakesiana. 



Plants and their capsules wholly glabrous. 5. O. argillicola. 



I. Oenothera cruciata Ntitt. Small-flowered Evening-Primrose. Fig. 3037. 



Oenothera cruciata Nutt. ; G. Don, Gen. Hist. 2 ; 686. 

 1832. 



Oenothera biennis var. cruciata T. & G. Fl. N. A. "i : 

 492. 1840. 



Onagra biennis cruciata Britton, Mem. Torr. Club 5 : 

 233. 1894. 



Onagra cruciata Small, Bull. Torr. Club 23: 169. 

 1896. 



Annual, glabrate or sparingly villous. Stem 

 erect, 2°-4° tall, usually simple, reddish or purple ; 

 leaves narrowly oblong or oblanceolate (the upper 

 ones often lanceolate), iJ'-4' long, acute, serrate- 

 denticulate, the lower ones slender-petioled, the 

 uppermost nearly sessile; flowers small, yellow; 

 spikes^ 4'-i2' long, leafy-bracted. calyx-tube slen- 

 der, I'-i' long, sparingly villous; calyx-segments 

 linear-lanceolate, shorter than the tube; petals 

 linear, 3"-6" long, l"-2" broad, acutish; capsules 

 I'-ii' long, gradually narrowed from the base, 

 villous; seeds prismatic-angled, i" long. 



Sandy soil. Maine to New York and Massachusetts. 

 Ascends to 2000 ft. in the Adirondacks. Aug.-Oct. 



