6. CRTJCIFERJi. 
Suborder I. SILIQUOS.^l. 
Pod (silique) not dividing ti-ansversely, linear or linear-lan- 
ceolate, opening by 2 valves tlirougliout ; dissepiment narrow 
but in its Droadest diameter. 
Tribe I. ARABIDEjE. Cotyledons accumbent (radicle late- 
ral), seed compressed. 
• Stigma 2-lohed. .nr 
1. Matthiola. Pod roimd or compressed. Lobes of stiff. 
erect gibbous or horned at the back. 
2. Chkiranthus. Pod compressed or 2-edged, teith an ele- 
vated longitudinal rib upon each valre. Lubes of stig. patent. 
Seeds in a single row in each cell. 
•* Stigma a disk or head. 
3. Nastuhtium. Pod subcylindrical ; valves convex, veinless. 
Seeds irregidarly in 2 rows, 
4. B.AJiBAEEA. Pod terete ; valves convex with a prominent 
longitudinal rib. Seeds in a single row. 
5. TuBEiTis. Pod compressed ; valves slightly convex with 
a prominent longitudinal rib. Seeds in 2 rows. 
6. Arabis. Pod compressed ; valves nearly flat with a pro- 
minent longitudinal rib, or with nimierous longitudinal 
veins. Seeds in a single row. 
7. Cardamine. Pod compressed ; valves flat, veinless. Seeds 
in 1 row ; seed-stalk simple, filifonn. 
8. Dent ARIA. Pod lanceolate, compressed ; valves flat, vein- 
less. Seeds in a single row ; seed-stalk dilated, winged. 
Tr. H. SISYMBEIE^. Cotyledons incumbent (radicle dor- 
sal), seed compressed. 
* Stigma of two closely converging erect ovate lobes. 
9. Hesperis. Pod quadrangular or subcompressed ; valves 
keeled, somewhat 3-veined. Seeds in a single row. 
** Stigma a disk with a thickened edge. 
10. Sisymbrium. Pod terete or rarely 4-edged; valves 
convex, vAth 3 longitudinal veins. Seeds in a single row, 
smooth ; seed-stalk filiform. — S. thalianum has a tetra- 
gonous pod and valves with 1 strong conspicuous rib. 
11. Ai.LiARiA. Pod terete; valves convex, with 3 longitu- 
dinal veins, the middle one prominent and strong, the 2 
