22 6. CRTJOlPEBiB. 



voted longitudinal rib upon each valve. Lobes of stig. patent. 

 Seeds in a single row in each cell. 



** Stigma a dish or head. 



8. NASTURTitrM. Pod terete ; valves convex, vdnless. Seeds 

 irregularly in 2 rows. 



4. Babbarea. Pod terete ; valves convex, loith a prominent 

 longitudinal rib. Seeds in a single row. 



6. Aeabis. Pod compressed ; valves nearly flat, with a pro- 

 minent longitudinal rib or with numerous longitudinal 

 veins. Seeds in a single or double row. 



6. Caudaminb. 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 ; seed-stalk dilated, mnged. 



Tr. II. SISYMJSItlUJE. Cotyledons incumbent (radicle dor- 

 sal), seed compressed. Seeds iu one row. 



* Stigma of two closely converging erect ovate lobes. 



8. Hbspbbis. Pod cLuadrangular or suboompressed ; valves 

 keeled, somewhat S-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 8 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. AiLiABiA. Pod terete ; valves convex, with 3 longitu- 

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

 lateral slender and branching. Seeds in a single row, 

 striate ; seed-stalk flattened, loinged. 



11. Erysimum. Pod 4-edged ; wafoes prominently keeled, !«i<A 

 1 longitibdinal vein. Seeds in a single row ; seed-stalk fili- 

 form. 



Tr. in. BRASSICEjE. _ Cotyledons conduplicate (longitudi- 

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



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

 globose, in a single row. 



