4 CRUCIFERjE. 



1. CAKILE. Pod angular, of 2 one-seeded joints, the upper ensi- 



form, lower often abortive. Fl. Purplish. 



2. CRAMBE. Pod 2- jointed, lower joint barren and stalk-like, 



upper globose, with one pendant seed, on a long stalk. Fl. 

 white. 



3. RAPHANUS. Pod monilif orm, tapering upwards, separating by 



transverse partitions ; lowermost cell barren. Fl. yellow. 



Sub-Order 2. SILIQUOS^K. Pod linear (seldom swollen and short), 

 3 10, or more times longer than broad. 



Tribe 1. BBASSICE^E. Pod elongated with a linear dissepiment. 

 Style short, stout. Cotyledons folded. 



4. BRASSICA. Cal. erect. Pod round or angular; valves some- 



times keeled. Style short, blunt. Fl. yellow. 



5. SIN APIS. Cal. spreading. Pod round or angular. Style mostly 



pointed. Seeds pungent. Fl. yellow. 



Tribe 2. SISYMBRIE^:. Pod elongated, angular or nerved, some- 

 times keeled. Seeds compressed. Cotyledons incumbent. 



(>. SISYMBRIUM. Cal. equal at the base. Pod sometimes 4-angu- 



lar, or with 2 strong prominent ribs. Seeds not striated. 



Stigmas combined into a disk. Fl. white or yellow. 

 7. ALLIARIA. Cal. loose. Pod with prominent nerves, 4-angled. 



Seeds striate. Fl. white. 

 *8. HESPERIS. Cal. bisaccate at the base. Pod many-nerved. 



Stigma of 2 converging lobes. Fl. pale lilac or white. 



Tribe 3. ARABIDE^E. Pod elongated; valves flat, sometimes 

 slightly keeled; dissepiment generally broader than the com- 

 pressed seeds. Cotyledons accumbent. 



9. CHEIRANTHUS. Pod round or compressed. Cal. with 2 oppo- 

 site sepals, saccate at the base. Stigma 2-lobed. Fl. yellow. 



10. CARDAMINE. Pod linear, compressed; valves flat, without 

 nerves ; usually opening with elasticity from below upwards. 

 Seed stalk filiform. Fl. white or pale purple. 



11. ARABIS. Pod compressed, with a prominent nerve in the 

 middle of each valve, or coarsely veined. Cal. erect. Fl. 

 white. 



12. TURRITIS. Pod keeled, valves slightly convex. Seeds in a 

 double row. Cal. nearly equal. Fl. yellowish white. 



13. BARB ARE A. Pod 2-edged from the prominent ribs, or nearly 

 tetragonal. Cal. erect, equal at the base. Fl. yellow. 



14. NASTURTIUM. Pod cylindrical, sometimes very short and 

 turgid ; valves convex, without veins. Cal. patent. Fl. white 

 or yellow. 



