50 
Spring Flora of Oklahoma 
margined, finely and distinctly reticulated. In fields and woods and 
sandy soil. April-June. 
3. Capnoides cryatallinum (Engelm.) Kuntze. Vesicular Cory- 
dalis. Erect or ascending, glabrous, l'-20' high, branching. Lower 
leaves slender-petioled, the upper sessile, all finely dissected into ob¬ 
long, or cuneate segments. Pedicels stout, short, diverging. Flowers 
spicate, 6"-8" long, bright yellow. Spur 3"-4" long. Crest large, 
dentate. Capsule 9" long, ascending or erect, densely covered with 
transparent vesicles. Seeds acute-margined, tuberculate-reticulate. 
Prairies. April-June. 
FAMILY 28. CRUCIFERiE. Mustard Family. 
Herbs with pungent, watery juice, and alternate leaves 
without stipules. Sepals 4, often falling off early. Petals 
usually 4, arranged in form of a cross. Stamens 6, the 
2 outer ones shorter than the 2 inner ones. Fruit a pod, 
divided into 2 cells by a thin partition. 
Key to Genera of Cruciferae. 
1. Pods globose to linear, not greatly elongated nor 
very broad and flat. 
Pubescence stellate, or of forked hairs. 
Pubescence stellate, or the hairs 2-lobed. 
Pods orbicular to linear, more or less flattened 
parallel to the broad partition. I. Draba. 
Pods globose or di-dynamo'us, swollen. 
II. Lesquerella. 
Pubescence of forked hairs; pods little longer than 
wide. 
Pods obovoid, swollen; flowers yellow. 
III. Camelina. 
Pods not swollen, flattened at right angles to 
the partition; flowers white. IV. Bursa. 
Pubescence of simple hairs, or wanting. 
