Class XV. TETRADYNAMIA. 



Stamens 6, 2 opposite ones shortest. 



Order L SILICULOSA. Fruit a short 

 roundish pod, or pouch. 



* Cotyledo7is accumbent. 



318. DRABA. Powc/% entu'e, laterally compressed ; valves 



nearly flat. Seeds numerous. 



316. VELLA. Pouch entire, with a prominent, dilated, 

 flat style, twice as long as the concave valves. 



330. CRAMBE. Pouch globose, stalked, coriaceous, of 

 1 cell, without valves, deciduous. Seed solitary. 



329. CAKILE. Pouch angular, of 2 joints, each of 1 

 cell, without valves ; the uppermost deciduous. Seeds 

 solitary. 



322. HUTCHINSIA. ■ Pouch nearly entire ; valves keel- 



ed, not bordered. Seeds 2, at least, in each cell. 

 Filaments simple. 



319. ALYSSUM. Pouch nearly entire, bordered, late- 



rally compressed ; valves concave. Seeds 1 or 2 in 

 each cell. Filam. often toothed. 



325. COCHLEARIA. Poiich nearly entire, turgid, rug- 

 ged, of 2 valves. Seeds numerous. 



324'. THLASPI. Pouch cloven, inversely heart-shaped ; 

 valves with a bordered keel. Seeds numerous. 



327. IBERIS. Pouch cloven, inversely heart-shaped. 

 Seeds solitary. 2 outer petals largest. 



323. TEESDALIA. Po?<c/« cloven, inversely heart-shaped; 

 |t valves keeled. Seeds 2 in each cell. Filam. each 

 WL bearing a scale at the base. 



^K ** Cotyledons ificwnbent. 



Hsn. SUBULARIA. Poiich entire, transversely com- 



I 



