Voi,. II.] 



EVENING-PRIMROSE FAMILY. 



485 



10. Epilobium Hornemanni Reichenb. Hornemann's Willow-herb. 



i - 2577.) 



Epilobium Hornemanni Reichenb. Icon. Crit. 2: 73. 

 1824. 



Epilobium alpinum var. ma/us 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, mostly broadly obtuse at 

 the apex, narrowed or rounded at the base, entire 

 or rather remotely denticulate, thin, W-i*," long, 

 4 // -io // wide; flowers few in the upper axils, purple 

 or violet, 3 // ~3J^ // broad; stigma entire; capsules 

 I'-z^' long, nearly glabrous, slender-pedicelled; 

 seeds about l /z" long, papillose, nearly beakless; 

 coma dingy-white. 



Moist places, White Mountains to Labrador, west to 

 Wisconsin and British Columbia, south in the Rocky 

 Mountains to Colorado and to California. Also in 

 Europe. Summer. 



7. 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 

 spikes. Calyx- tube elongated, terete, gradually enlarged at the throat; calyx-segments nar- 

 row, the tips free in the bud. Petals 4, spreading. Stamens 8, equal in length; filaments fili- 

 form; anthers linear. Ovary 4-celled; united styles filiform; stigma 4-cleft; ovules numer- 

 ous, 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, the wild ass, 

 said to refer to the similarity of its leaves to the ears of that animal.] 



About 12 species, chiefly North American. 



Flowers small ; petals i"-2" broad. 

 Flowers large ; petals M'-z' broad. 



Capsules Y 4 -i' long, abruptly narrowed at the apex. 

 Capsules i#'-i 1 A' long, gradually narrowed from near the base. 



1. O. cruciata. 



2. O. biennis. 



3. O. Oakesiana. 



i. Onagra cruciata (Nutt.) Small. Small-flowered Evening- Primrose. 



(Fig. 2578.) 



OEnothera cruciala Nutt. ; Ser. in DC. Prodr. 3: 



47, as synonym. 1828. 

 OEnothera biennis var. cruciala 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, glabrous or sparingly villous. Stem 

 erect, 2 c -4 tall, usually simple, purple; leaves 

 narrowly oblong or oblanceolate (the upper 

 ones often lanceolate), i^ / -4 / long, acute, 

 serrate-denticulate, the lower ones slender-pe- 

 tioled, the uppermost nearly sessile; flowers 

 small, yellow, nocturnal; spikes 4 / -i2 / long, 

 leafy-bracted; calyx-tube slender, %'-i' long, 

 sparingly villous; calyx-segments linear- 

 lanceolate, shorter than the tube; petals linear, 

 %' long, i // -2 // broad, acutish; capsules V- 

 itf' long, gradually narrowed from the base, 

 villous; seeds prismatic-angled, i // long. 



Vermont to New York and Massachusetts. As- 

 cends to 2000 feet in the Adirondacks. Aug.-Oct. 



