146 SUMMER FLOWERS. 



(24) Turritis pod compressed, the valves slightly convex, with 



a prominent longitudinal nerve ; stigma capitate ; seeds in 

 two rows. 



(25) Arabia pod compressed, the valves nearly flat, with a pro- 



minent longitudinal nerve, or rarely nerveless with nume- 

 rous longitudinal veins ; stigma obtuse ; seeds in a single 

 row. 



(26) Cardamine pod compressed, the valves flat, nerveless ; 



stigma capitate ; seeds in a single row. 



J{ Style forming a stout, conical, often seed-hearing beak. 



(27) Brassica calyx erect ; pod terete or angular ; seeds globose, 



in a single row. 



(28) Sinapis calyx spreading ; pod terete or angular ; seeds 



globose, in a single row. 



(29) Diplotaxis calyx spreading ; pod compressed ; seeds oval 



or oblong, in two rows ; beak less distinct than in Brassica 

 and Sinapis. 



ft Pods without valves or dissepiments. 



(30) Raphanus pods linear or oblong, tapering upwards, di- 



vided transversely into several one-seeded joints, forming 

 cells, the lowermost barren. 



** Fruit a silicule or. pouch, scarcely more than one-half longer 

 than broad. 



t Pouch without valves, or one-celled, one-seeded. 



(31) Cakile pouch two-jointed, the joints placed end to end, 



the upper one angular, deciduous, one-seeded, the lower 

 sometimes sterile. 



(32) Crambe pouch two-jointed, the joints placed end to end, 



the upper globose, one-seeded, the lower barren, stalk-like. 



(33) Senebiera pouch somewhat kidney-shaped, almost two- 



lobed, of two cells placed side by side, not bursting ; cells 

 one-seeded. 



