6. CKUCIFEE^]. 23 



** Stigma a disk or head. 



3. RADICULA. Pod terete; valves convex, veinless. Seeds 

 irregularly in 2 rows. 



4. BARB ARE A. Pod terete ; valves convex, with a prominent 

 longitudinal rib. Seeds in a single row. 



5. ARABIS. Pod compressed ; valves nearly flat, with a pro- 

 minent longitudinal rib or with numerous longitudinal 

 veins. Seeds in a single or double row. 



6. CARDAMINE. Pod compressed ; valves flat, veinless. Seeds 

 in 1 row ; seed-stalk simple, filiform. 



7. DENTARIA. Pod lanceolate, compressed ; valves flat, vein- 

 less. Seeds in a single row j seed-stalk dilated, 'winged. 



Tr. II. SISYMBRIE^E. Cotyledons incumbent (radicle dor- 

 sal), seed compressed. Seeds in one row. 



* Stigma of two closely converging erect ovate lobes. 



8. HESPERIS. Pod quadrangular or subcompressed ; valves 

 keeled, somewhat 3-veined. Seeds in a single row. 



** Stigma a disk with a thickened edge. 



9. SISYMBRIUM. Pod terete or rarely 4-edged ; valves con- 

 vex, with 3 longitudinal veins. Seeds in a single row, 

 smooth ; seed-stalk filiform. S. Thalianum has a tetra- 

 gonous pod with 1 strong conspicuous rib on the valves. 



10. ALLIARIA. Pod terete ; valves convex, with 3 longitu- 

 dinal veins, the middle one prominent and strong, tne 2 

 lateral slender and branching. Seeds in a single row, 

 striate \ seed-stalk flattened, winged. 



11. ERYSIMUM. Pod 4-edged; valves prominently keeled, 

 With 1 longitudinal vein. Seeds in a single row ; seed-stalk 

 filiform. 



Tr. III. BRASSICE^E. Cotyledons conduplicate (longitudi- 

 nally folded in the middle) ; radicle dorsal, within the fold. 



12. BRASSICA. Cal. erect. Pod terete or angular. Seeds 

 globose, in a single row. 



13. SINAPIS. Cal. spreading (in the flower). Pod terete or 

 angular. Seeds in a single row. 



