Spring Flora of Oklahoma 
51 
Pods globose to oblong, scarcely or not at all flat¬ 
tened. 
Flowers yellow, small. V. Radicula. 
Flowers white, large. VI. Sisymbrium. 
Pods short, strongly flattened at right angles to the 
narrow partition; flowers white or purplish. 
Seeds solitary in each cell of the pod. 
VII. Lepidium. 
Seeds 2-several in each cell of the winged pod. 
VIII. Thlaspi. 
2. Pods elongated-linear, or large. 
Cotyledons incumbent. 
Stigma simple, not 2-lobed. IX. Sophia. 
Stigma 2-lobed, the lobes over the placentae. 
Leaves various, not cordate-clasping. 
Pods 4-angled; hairs of the stem 2-forked with 
appressed branches. X. Cheirinia. 
Pods terete; pubescence, if present of simple 
hairs. XI. Norta. 
Leaves cordate-clasping, sessile, entire. 
XII. Conringia. 
Cotyledons accumbent. XIII. Arabis. 
I. DRAB A (Dill.) L. 
Low, tufted, mostly stellate-pubescent herbs, with 
scapose or leafy stems, simple leaves and mainly race¬ 
mose flowers. Flowers white or yellow. Pods elliptic, 
oblong, or linear, flattened parallel with the partition. 
Seeds several in 2 rows in each cell. 
Flowers white. 
Leaves entire, obovate or oblong. 1. D. caroliniana. 
Leaves dentate, cuneate. 2. D. cuneifolia. 
Flowers yellow. 3. D. brachycarpu. 
* 
