li;i Cruciferae 



Family 35. CRUCIFERAE. Mustard Family. 



Herbs or rarely suffrutescent with acrid juice, alter- 

 nate leaves and racemose or corymbose flowers. Sepals 

 4. deciduous or persistent, the 2 outer narrow, the inner 

 similar, concave or saccate at base. Petals 4. rarely 2 

 or none, hypogynous, cruciate, nearly equal, generally 

 clawed. Stamens 6, rarely fewer, hypogynous, tetrady- 

 namous. Pistil 1, compound, consisting of 2 united car- 

 pels, the parietal placentae united by a dissepiment : style 

 generally persistent, sometimes none; stigma discoid or 

 more or Less 2-lobed. Fruit a silique or silicic, usually 

 2-celled, 2-valved or rarely indehiscent. Endosperm 

 none ; cotyledons incumbent, accumbentor conduplicate. 



^* Pods dehiscent into 2 valves to the base. 

 Pods elongated-linear, at least twice as long as wide. 



Flowers white or purplish, or yellow in some species of Rorijia. 

 Subaquatic or marsh plants. 



Seeds in 1 row in each cell. 12. Cabdamine. 



Seeds in 2 rows in each cell. 11. Rokipa. 



Not aquatic or marsh plants. 



Rootstocks tuberous. 13. Dkntakia. 



Roots fibrous. 

 Petals flat. 



Pods usually compressed, seeds fiat, winged. 



22. Ahabis. 

 Pods terete; seeds oblong or globose, wingless. 



3. Thelypodium. 

 Petals undulate-orisped or twisted. 



Pods terete or nearly so; cotyledons incumbent. 



3. CAUI.ANTHUS. 



Pods compressed; cotyledons accumbent. 



4. Stkeptanthcs. 

 Flowers yellow. 



Pods borne on a long stipe. 1. Stanley a. 



Pods terete or 4-angled, sessile or short stipitate. 

 Pubescence simple or none. 

 Pods spreading. 



Seeds globose or oblong. 

 Seeds in 2 rows. 

 Seeds in 1 row. 

 Seeds Bat. 

 Pods erect, appressed to the stem. 

 Pubescence branched or Stellate. 



Leaves entire or faintly toothed. 

 Leaves deeply 2-pinnattfld. 

 Pods Bat. 



