18 6. CRUCIFER^. 



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. CRUCIFERJ];. 



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 siHcle, the valves opposite the shorter stamens. 



Suborder I. SILIQUOSiE. 



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

 dissepiment narrow but in its broadest diameter. 



Tribe I. ARABIDE^. 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 bach. 



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

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

 lobes patent. Seeds iu 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 vpith a pro- 

 minent longitudinal rib, or with numerous longitudinal 

 veins. Stigma obtuse. Seeds in a single row. 



7. Cardamine. Pod compressed ; valves flat, veinless. 

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



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

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

 dilated, winged. 



Tr. II. SISYMBRIEjE. Cotyledons incumbent contrary to the 

 dissepiment, radicle dorsal, seed compressed. 



