168 KEY AND FLORA 
71. ONAGRACEA. Eventna Primrose FAMILY 
Herbs, rarely shrubs or trees. Leaves opposite or alternate, 
without stipules. Flowers actinomorphic. Limb of the calyx 
epigynous, 2-4-lobed. Petals 2-4, rarely wanting, quickly fall- 
ing off. Stamens 1-8. Ovary usually 4-celled; style thread- 
like; stigma entire or 4lobed; ovules 1 or more in the inner 
angle of each cell. Fruit a capsule, berry, or drupe. Seeds 
1 or more, smooth or hairy. 
I. G@NOTHERA L. 
Herbs, rarely shrubby. Leaves alternate. Flowers large, yel- 
low, red, or purple. Calyx tube 4-angled. Petals 4. Stamens 
8. Capsule usually 4-celled, many-seeded. 
B. Fl. species 1 (Onagra); species 2, 3 (Avneiffia) ; species 4 
(Hartmannia); species 5 (Megapterium). 
1. &. biennis L. Common EveninG Primrose. Annual or bien- 
nial. Erect and usually stout, 1-5 ft. high. stem usually simple, 
more or less downy and hairy. Leaves lanceolate, acute or taper- 
pointed, sessile or the lower ones petioled. Flowers bright yellow, 
1-2 in. in diameter, opening in the evening. Pod oblong, narrowed 
above, erect, nearly cylindrical. In dry soil. 
2. @. pumila L. Saati Sunprops. Perennial. Stem erect, finely 
downy, 4-24 in. high. Leaves usually smooth, entire, obtuse or nearly 
so, the basal ones spatulate, those of the stent varying from oblanceo- 
late to lanceolate. Spikes loose, nodding when young, Flowers 1-1 
in. in diameter. Pods slightly glandular-downy, club-shaped, 1—} in. 
long. In dry soil. 
3. &. fruticosa L. Sunprops. Biennial or perennial. Stem erect, 
often rather stout, 1-3 ft. ligh, downy or sometimes smooth, Leaves 
lance-oblong, or in one variety linear or nearly so, usually minutely 
toothed. Racemes often corymbed. Flowers open in the daytime, 
showy, yellow, 1-2 in. in diameter. Pod nearly sessile, ellipsoidal, 
with prominent ribs and strong wings. Dry soil, common. 
4. G&. speciosa Nutt. Snowy Primrose. Perennial. Stem downy, 
erect. or somewhat decumbent, 6 in.-3 ft. high. Leaves broadly 
lanceolate to linear, sinuate-dentienlate or sinuate-pinnatifid, 2-3 in. 
long. Flowers opening in the daytime, few, 1!-34 in. in diameter, 
white to pale pink. Pod strongly 8-ribbed. Prairies S.W. 
