466 
The Ohio Naturalist. 
[Vol. XV, No. 5, 
0 . Oenothera L. 
Annual or biennial herbs, leaves alternate with sinuate or 
toothed margin; flowers yellow, in terminal spikes, hypanthium 
long and slender; petals and sepals 4; stamens 8 ; ovulary with 4 
cavities; capsule 4-angled, opening longitudinally. 
1. Hirsute-pubescent; upper bracts shorter than the ovulary, deciduous. 
0. biennis. 
1. Velvety-pubescent; upper bracts longer than the ovulary, persistent. 
O. oakesiana. 
1. Oenothera biennis L. Common Evening-primrose. Tall, 
erect, branched biennial herb, hirsute pubescent, 1-6 ft. high; leaves 
lanceolate, acute, denticulate 1-6 in. long; flowers yellow, borne 
in leafy bracts, 1-2 in. broad, capsule about ^4 in. long, hirsute, 
narrowed at the top. General. 
2. Oenothera oakesiana Robb. Oakes’ Evening-primrose. 
Plant resembling the preceeding species but with velvety appressed 
hairs; leaves narrow, oblanceolate, dentate; flowers yellow 1-1 yi in. 
broad. Erie Count}'. 
6 . Raimannia Rose. 
Annual, biennial - cr perennial herbs with prostrate or erect 
stems; leaves alternate sinuate or pinnatified; flowers, yellow 
axillary or sometimes in terminal spikes, nocturnal; hypanthium 
long, sepals 4; petals 4; stamens 8 ; ovulary with 4 cavities; 
capsule dehiscent longitudinally. 
1. Raimannia laciniata (Hill.) Rose. Cutleaf Evening-prim¬ 
rose. Stem decumbent or erect, 4 in. to 2ft. tall; leaves deeply 
sinuate-dentate or pinnatified; 2^-2 in. long; flowers usually 
axillary, yellow; capsule linear in. long, hirsute-pubescent. 
Cuyahoga County. 
7. KneifAa Spach. 
Shrubby, annual or perennial herbs with alternate, linear, 
entire or dentate leaves, flowers yellow in terminal spikes or 
racemes; sepals and petals 4; stamens 8 ; stigma 4-cleft; capsules 
oval or clubshaped, 4 winged or angled, opening longitudinally. 
1. Flowers in. broad or less; hypanthium equal to or less than ovulary. 
K. puniila. 
1. Flowers more than x /i in. broad; hypanthium longer than the ovulary. 2. 
2. Plant hirsute with spreading hairs; capsule club-shaped. K. pratensis. 
2. Plant softly pubescent; capsule oblong, not club-shaped. K. frulicosa. 
1. Kneiffia pratensis Small. Meadow Sundrops. Erect, 
perennial, hirsute herbs IRj-.SRj ft. high; leaves oblong-lanceolate 
or elliptic-lanceolate; flowers in terminal leafy-bracted spikes; cap¬ 
sules clubshaped, sessile. Xo specimens. 
