466 The Ohio Naturalist. [Vol. XV, No. 5, 



.5. Oenothera L. 



Annual or biennial herbs, leaves alternate with sinuate or 

 i:oothed 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. Cakes' Evening-primrose. 

 Plant resembling the preceeding species but with velvety appressed 

 hairs; leaves narrow, oblanceolate, dentate; flowers yellow 1-1 >2 in. 

 broad. Erie County. 



6. Raimannia Rose. 



Annual, biennial or 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 S; ovulary with 4 cavities; 

 capsule dehiscent longitudinally. 



1. Raimannia laciniata (Hill.) Rose. Cutleaf Evening-prim- 

 rose. Stem decumbent or erect, 4 in. to 2}^ ft. tall; leaves deeply 

 sinuate-dentate or pinnatified; ^-2 in. long; flowers usually 

 axillary, yellow; capsule linear 3/^-1^ in. long, hir.su te-pubescent. 

 Cuyahoga County. 



7. KneifRa Spach. 



vShrubby, annual or perennial herbs with alternate, linear, 

 entire or dentate leaves, flowers yellow in tenninal spikes or 

 racemes; .se])als and petals 4; stamens 8; stigma 4-cleft; capsules 

 oval or clubshaped, 4 winged or angled, opening longitudinally. 



1. Flowers }^ in. Ijroad or less; hypanthium equal to or less than ovulary. 



K. pinni/a. 



1. Flowers more than 3^ in. broad; hypanthium longer than the ovulary. 2. 



2. Plant hirsute with spreading hairs; capsule cluli-shaped. K. pratcnsis. 

 2. Plant softly pubescent; capsule oblong, not clul)-sha])cd. K . fruticosd. 



1. Kneiffia pratensis Small. Meadow Sundrops. Erect, 

 perennial, hirsute herbs 1^-3^ ft. high; leaves oblong-lanceolate 

 or elliptic-lanceolate ; flowers in terminal leafy-bracted spikes; cap- 

 sules clubshaped, sessile. No specimens. 



