Vor. II.] EVENING-PRIMROSE FAMILY. 485 
1o. Epilobium Hornemanni Reichenb. Hornemann’s Willow-herb. 
(Fig. 2577.) 
Epon Hornemanni Reichenb. Icon, Crit. 2: 73. 
1824. 
Epilobium alpinum var. majus A. Gray, Man. Ed. 5, 
177. 1867. 
Erect, 6/-12’ 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, 6’/-15’’ long, 
4//-10/’ wide; flowers few in the upper axils, purple 
or violet, 3//-3%4’’ broad; stigma entire; capsules 
1/-214’ long, nearly glabrous, slender-pedicelled; 
seeds about 1%’ 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. 
Thc ONAGRA Adans. Fam. Pl. 2: Sh. 0763" 
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 tipsfreeinthe 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 1’’-2'’ broad. 1. O. cruciata. 
Flowers large; petals 34'-2' broad. 
Capsules ’-1' long, abruptly narrowed at the apex. 2. O. biennis. 
Capsules 1%'-1'4' long, gradually narrowed from near the base. 3. O. Oakesiana. 
1. Onagra cruciata (Nutt.) Small. Small-flowered Evening-Primrose. 
(Fig. 2578.) 
OEnothera cruciata Nutt.; Ser. in DC. Prodr. 3: 
47, as synonym. 1828. 
OEnothera biennis var. cruciata T. & G. FI. N. 
A. 1: 492. 1840. 
Onagra biennis cruciata Britton, Mem. Torr. 
Club, 5: 233. 1894. 
ae cructata Small, Bull. Torr. Club, 23: 169. 
1896. 
Annual, glabrous or sparingly villous. Stem 
erect, 2°-4° tall, usually simple, purple; leaves 
narrowly oblong or oblanceolate (the upper 
ones often lanceolate), 114’-4’ long, acute, 
serrate-denticulate, the lower ones slender-pe- 
tioled, the uppermost nearly sessile; flowers 
small, yellow, nocturnal; spikes 4/-12/ long, 
leafy-bracted; calyx-tube slender, 3/’-1/ long, 
sparingly villous; calyx-segments linear- 
lanceolate, shorter than the tube; petals linear, 
¥%4/ long, 1//-2’’ broad, acutish; capsules 1/- 
14’ long, gradually narrowed from the base, 
villous; seeds prismatic-angled, 1// long. 
Vermont to New York and Massachusetts. As- 
cends to 2000 feet in the Adirondacks. Aug.—Oct. 
