CRUCIFER-aS. (mustard family.) 29 



* Pod terete, or slightly flattened ; the valves nerveless. 

 1 N ASTURTIUM. Pod linear, oblong, or even globular, turgid. Seeds irregularly In two 

 rows in each cell, small. 



2. IODANTHUS. Pod linear, elongated. Seeds in a single row in each cell. 



* Pod flat ; the valves nerveless. Seeds in one row in each cell. 



3. LEA VENWORTHIA. Pod oblong. Seeds winged. Embryo straight ! Leaves all radical 



4. DENTARIA. Pod lanceolate. Seeds wingless, on broad seed-stalks. Stem few-leaved. 



6. CARDAMINE. Pod linear or linear-lanceolate. Seeds wingless, on slender seed-stalks. 

 Stems leafy below. 



» * * Pod flattened or 4-angled, linear ; the valves one-nerved in the middle, or veiny. 



6. ARABIS. Pods flat or flattish. Seeds in one row in each cell. Flowers white or purple. 



7. TURRITIS. Pods and flowers as in Arabis, but the seeds occupying two rows in each cell. 



8. BARBAREA. Pod somewhat 4-sided. Seeds in one row in each celL Flowers yellow 



Tribe II. SISYMBRIEjE. Pod elongated. Seeds thickish. Cotyledons incumbent, 

 narrow, plane. 



9. ERYSIMUM. Pod sharply 4-angled, linear. Flowers yellow. 



10. SISYMBRIUM. Pods terete, or obtusely 4- 6-angled, or flattish. Flowers white or yellow. 



Tribe III. BRASSICE.SE. Pod elongated. Seeds globular. Cotyledons incumbent 

 and conduplicate, folded round the radicle. 



11. SINAPIS. Pod terete ; the valves 1 - 5-nerved. Calyx spreading. 



II. SILICULOSiE. Pod short, a silicle or pouch, opening by valves. 



Tribe IV. ALYSSUVEjE. Pod oval or oblong, flattened parallel to the broad parti- 

 tion, if at all. Cotyledons accumbent, plane. 



12. DRABA. Pod flat, many-seeded : valves 1 - 3-nerved or nerveless. 



13. VESICARIA. Pod globular, inflated, 4 - several-seeded : valves nerveless. 

 1. NASTURTIUM. Pod turgid, many-seeded : valves nerveless. 



Tribe V. CAMELINEj;, Pod ovoid or oblong, flattened parallel to the broad parti- 

 tion. Cotyledons incumbent, plane. 



14. CAMELINA. Pod obovoid, turgid : valves 1-ncrvcd. Style slender. 



Tribe VI. LEPIDUVE^. Pod short, the boat-shaped valves flattened contrary to 

 the narrow partition. Cotyledons incumbent (accumbent in one instance), plane. 

 16. LEPIDIUM. Pod two-seeded. 



16. CAPSELLA. Tod many-seeded, inversely heart-shaped-triangular. 



Tribe VII. SUBVLARIE^l. Pod oval, turgid, somewhat flattened contrary to the 

 broad partition. Cotyledons long and narrow, transversely folded ou themselves and 

 incumbent. 



17. SUBULARIA. Pod several-seeded : the valves convex-boat-shaped. 



Tribe VUI. SENEBIEREJ;. Pod compressed contrary to the very narrow parti- 

 tion ; the cells separating from the partition at maturity as two closed one-seeded nut- 

 lets. Cotyledons as in Tribe 7. 



18. SENEBIERA. Nutlets or closed cells roundish, reticulated. 



III. LOMENTACEiE. Pod articulated, i. e. separating across into two 



or more closed joints. 

 Tribe IX. CAK.IIiIiVE.fl3. Cotyledons plane and accumbent, as in Tribe 1. 



19. CAKILE. Pod short, 2-jointed : the joints 1-celled and 1-seeded. 



Tribe X. RAPHANEK Cotyledons conduplicate and incumbent, as in Tribe 3. 



20. RAPBANUS. Pod elongated se7eral-seeded, transversely intercepted. 



3* 



