6. CBUcirEEJS. 21 



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

 minent longitudinal rib or with numerous longitudinal 

 veins. Seeds in a single or double row. 



6. Cabdaminb. Pod counpveased.; valves JlatfVeinless. Seeds 

 in 1 row ; seed-stalk simple, filiform. 



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

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



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

 sal), seed compressed. Seeds in one row. 



* Stigma of two closely converging erect ovate lobes. 



8. Hespbris. Pod quadrangular or subcompressed ; valves 

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



** Stigma a disk ivith a thickened edge. 



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

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

 smooth ; seed-stalk filiform. — S. thalianum has a tetra- 

 gonous pod with 1 strong conspicuous rib on the valves. 



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

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

 Jateral slender and branching. Seeds in a single row, 

 striate; seed-stalk flattened, winged. 



11. EBTSiMtTM. Pod 4redged ; «afoes prominently keeled, jra'iA 

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

 form. 



Tr. in. BRASSICE2E. _ 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. 



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

 angular. Seeds in a single row. 



14. Diplotaxis. Cal. patent. Pod compressed. Seeds oval 

 or oblong, in 2 rows. 



Suborder II. LATISEPT^. 



Pouch (silicle) short, not dividing transversely, opening with 

 two valves ; dissepiment in its broadest diameter. 



Tr. IV. ALYSSINE^. Cotyledons accumbent. 



15. Alyssum. Pouch roundish or oval, compressed. Seeds 



