CRUCIFERAE 59 
3. CRUCIFERAE. (BRASSIACEAE.) 
Pods stipitate, anthers spirally twisted. 
Stipes several cm. long, flowers yellow. 1. Stanleya. 
Stipes 1 mm. long, flowers pink. 2. Thelypolium. 
Pods sessile on the receptacle; anthers not twisted, 
A. Pods compressed or flattened contrary to the narrow partition. 
Cells of pod 1-seeded. Pods usually winged, notched at the apex. 
3. Lepidium. 
Cells of pods with 2 to many seeds. 
Flowers white, 1-2 mm. broad; pubescense not stellate. 
Pods winged, hairs simple or none. 4, Thlaspi. 
Pods wingless, cuneate, hairs branched. 14. Bursa. 
Flowers yellow, 1-1.3 cm. broad; stellate pubescent. 
12. Physaria. 
B. Pods neither compressed nor flattened contrary to the partition. 
a. Pods terete or tetragonal, not flattened. 
Pods short, rarely more than twice as long as wide. 
Petals entire. , 
Pubescence stellate, seeds flat. 13. Lesquerella. 
Pubescence not stellate. : 
Leaves entire or toothed, the upper sessile, clasping by 
a sagittate base. 15, Camelina. 
Leaves lobed or pennatifid, not sagittate. 9. Roripa. 
Petals deeply 2-cleft. 22. Berteroa. 
Pods long, several times as long as wide. 
Pod scarcely beaked, merely tipped by a short style or a 
sessile stigma. 
Pods terete or nearly so, 
Seeds in 2 rows in each cell of the pod. 
Valves of the pod nerveless. 9. Roripa. 
Valves of the pods 1-nerved, 17. Sophia. 
Seeds in one row in each cell of the pod. 
Pubescence of simple hairs, leaves runcinate or entire. 
5. Sisymbrium. 
Pubescence of forked hairs, leaves pinnately dissected. 
Sophia. 
17. Sophia. 
Stem leaves clasping by a cordate base. 21. Conringia. 
Stem leaves not clasping, ‘ 
Seeds plump, ‘leaf-blades entire or toothed. 
19. Erysimum, 
Seeds flat, leaf-blades pinnatifid. 8. Barbarea. 
Pods with a long distinct beak. 
Beak flat, sword-like. | 6. Sinapis. 
Beak conic or 4-angled. 7. Brassica. 
b. Pods flattened parallel to the broad partition. 
Pods orbicular, with flattened, wing-like margins. 
20. Alyssum. 
Pods rarely orbicular, not wing margined. 
Valves nerveless, 
Seeds in two rows, peds usually short. 16. Draba. 
Seeds in one row, pods long. 
