18 6. CRUCIFER^E. 



Its. narrow flat. E. B. S. 2877- R- iii- 1 Foliage greyish green 

 glaucous. Lts. spreading. Fl. purplish, afterwards whitish ; 

 lower pet. spathulate, sides of haft scarcely inflexed. Fields. 

 A. VI. IX. 



Order VI. CRUCIFER^l. 



Sep. 4. Cor. cruciform of 4 petals. Stam. 6, tetradynamous ; 

 2 shorter opposite the lateral petals. Ovary free, with marginal 

 placentas meeting in the middle. Stigmas 2, opposite to the pla- 

 centas (or rather, alternate with them, lobed and combining). 

 Fruit a silique or silicle, the valves opposite the shorter stamens. 



Suborder I. SILIQUOS^. 



Pod (silique) linear or linear-lanceolate, opening by 2 valves, 

 dissepiment narrow but in its broadest diameter. 



Tribe I. ARABIDE^E. Cotyledons accumbent parallel to the 

 dissepiment, radicle lateral, seed compressed. 



1. MATTHIOLA. Pod round or compressed. Stigma 2-lobed, 

 lobes erect gibbous or horned at the back. 



2. CHEIRANTHUS. Pod compressed or 2-edged, with an ele- 

 vated longitudinal rib upon each valve. Stigma 2-lobed, 

 lobes patent. Seeds in a single row in each cell. 



3. NASTURTIUM. Podsubcylindrical; valves convex, veinless. 

 Stigma capitate. Seeds irregularly in 2 rows. 



4. BARBAREA. Pod terete; valves convex with a prominent 

 longitudinal rib. Stigma capitate. Seeds in a single row. 



5. TURRITIS. Pod compressed; valves slightly convex with 

 a prominent longitudinal rib. Stigma capitate. Seeds in 

 2 rows. 



6. ARABIS. Pod compressed ; valves nearly flat with a pro- 

 minent longitudinal rib, or with numerous longitudinal 

 veins. Stigma obtuse. Seeds in a single row. 



7. CARDAMINE. Pod compressed ; valves fiat, veinless. 

 Stigma capitate. Seeds in 1 row; seed-stalk simple, filiform. 



8. DENTARIA. Pod lanceolate, compressed ; valves flat, vein- 

 less. Stigma capitate. Seeds in a single row ; seed-stalk 

 dilated, winged. 



Tr. II. SISYMBRIE^E. Cotyledons incumbent contrary to the 

 dissepiment, radicle dorsal, seed compressed. 



