102 TETR ADYNAMIA. 



4. THLASPI. Pouch compressed, emarginate ; the valves keel- 

 shaped (often winged), many-seeded. Filaments without teeth 

 distinct. Cat. unequal in its insertion, patent. Br. 



5. TEESDALIA. Pouch emarginate, the valves keel-shaped ; cells 

 2-seeded. Filaments with a little scale on their inside. 



6. LEPIDIUM. Pouch with- 1 -seeded cells, their valves keel- 

 shaped. Petals equal. Br. 



7. COCHLEARIA. Pouch subovate, many- seeded, their valves 

 turgid. Seeds not margined, their cotyledons accumbent. The 

 shorter ji laments without teeth. Cat. patent. Br. 



8. SUBULARIA. Pcwc/ioval, pointless (Silic. mittica, Br.}, many- 

 seeded ; valves turgid. Cotyledons incumbent, linear, bipar- 

 tite a (licrures}. Br. 



9. DRABA. Pouch entire, oval ; valves plane, or a little convex; 

 cells many-seeded. Seeds not margined; cotyledons accum- 

 bent. Filaments without teeth. Br. 



10. CAMELINA. Pouch subovate, many-seeded ; their valves tur- 

 gid. Cotyledons incumbent. Filaments without teeth. Br. 



2. S1LIQUOSA. 



11. CARDAMINE. Pod linear, with the margins truncated ; valves 

 plane, nerveless (often bursting elastically), narrower than the 

 dissepiment. Br. 



12. ARABIS. Pod linear, crowned with the nearly sessile stigma ; 

 valves veined or nerved. Seeds in one row. Cotyledons ac- 

 cumbent. Cal. erect. Br. 



13. TURRITIS. Pod elongated, 2-edged ; valves nerved and 

 keeled. Seeds in two rows. Cotyledons accumbent. Br. 



14. BARBAREA. Pod 4-edged. Cotyledons accumbent. Seeds 

 in one row. Cal. erect. Small glands placed between the 

 shorter filaments. Br. 



15. NASTURTIUM. Pod rounded (sometimes short) ; valves con- 

 cave, nerveless, not carinated. Cotyledons accumbent. Cal. 

 patent. Br. 



16. SISYMBRIUM. Pod rounded or angular. Cotyledons incum- 

 bent (sometimes obliquely), plane. Cal. patent (sometimes 

 nearly erect). Br. 



17. ERYSIMUM. Pod 4-sided. Seeds not margined. Cotyledons 

 incumbent. Stigma capitate,, sometimes notched, with the 

 lobes patent. Cal. closed. Br. 



18. CHEIRANTHIJS. Pod compressed or two-edged. Cotyledons 

 accumbent. Cal. closed ; opposite leaflets saccate at the base. 

 Stigma placed upon a style, two-lobed, with the lobes patent 

 or capitate. Br. 



Some cotyledons in this class are tripartite, as in Lepidivm sativum, and 

 the genus Heliophila, according to Brown. 



