116 
Spring Flora of Oklahoma 
Stamens unequal in length, the alternate longer. 
Ovules and seeds many, on slender funiculi; cap¬ 
sules club-shaped. 
Flowers yellow. II. Kneiffia. 
Flowers white, pink, or reddish. 
III. Hartmannia. 
Ovules or seeds few, sessile, in 1 or 2 rows. 
Plants normally acaulescent. IV. Lavauxia. 
Plants caulescent. V. Megapterium. 
2. Fruit indehiscent, nut-like. 
Calyx-tube obconic; filaments with scales at the base; 
ovary 4-celled. VIII. Gaura. 
I. RAIMANNIA Rose. 
Usually low, annual, biennial, or perennial caulescent 
herbs, with prostrate or erect stems. Leaves alternate, 
sinuate, or pinnatifid. Flowers perfect, yellow, axillary, 
or sometimes in terminal spikes, nocturnal. Calyx-tube 
elongated. Calyx-segments 4, finally reflexed. Petals 4, 
spreading. Stamens 8. Ovary 4-celled, elongated. Stig¬ 
ma deeply 4-cleft. Ovules numerous, in 2 rows. Capsule 
usually cylindric. Seeds numerous, in 2 rows, terete, 
crowned by a tubercle. 
1. Rainiannia laciniata (Hill.) Rose. Cut-leaved Evening- 
Primrose. Decumbent or ascending, simple or sometimes branched, 
glabrous or sparingly hirsute-pubescent. Leaves sessile or the lower 
petioled, oval-lanceolate, or oblanceolate, sinuate-dentate, or often 
pinnatifid. Flowers axillary, 5"-15" broad. Calyx lobes reflexed, 
much shorter than the slender tube. Capsule linear, long, 
more or less pubescent, straight or curved upward. Seeds strongly 
pitted. 
In dry, shady soil. May-June. Common. 
Yar. grandis Biritton. With larger flowers. Petals l'-l%' long. 
Frequent in sandy fields. May-June. 
II. KNEIFFIA Spach. 
Annual or perennial, caulescent, often shrubby herbs. 
