XXXil 
TABLE OF GENERA. 
19. Cardamine. Pod flat, linear; valves flat, ribles9. Style short, or absent. 
Seed-stalks slender. Seeds ovate, not bordered. 
20. Arabis. Pod linear, compressed; valves with 1 rib, or many longitudinal 
veins. Stigma sessile. Seeds in 1 row. Calyx erect. 
21. Turritis. Pod linear, 2-edged; valves with a prominent rib. Seeds in 2 rows. 
Calyx lax. 
22. Barbarea. Pod linear, 4-angled; valves keeled, concave, not pointed. Seeds 
in 1 row. Calyx erect. 
23. Nasturtium. Pod nearly cylindrical, oblong or linear, without veins or keel. 
Seeds in 2 irregular rows. Calyx spreading. 
24. Sisymbrium. Pod linear, rounded or angular; valves concave. Calyx equal. 
Seeds in 1 row. 
25. Erysimum. Pod linear, 4-angled; valves prominently keeled. Style very 
short. Seeds in 1 row. Calyx erect, equal at the base. 
26. Cheiranthus. Pod linear, compressed, or 2-edged, with an elevated rib on 
each valve. Stigma upon a style, 2-lobed. Calyx erect, 2 opposite sepals 
saccate at the base. 
27. Matthiola. Pod rounded or compressed. Stigma sessile, lobes erect. Calyx 
erect, 2 opposite sepals saccate at the base. Longer filaments dilated. 
28. Hesperis. Pod 4-angled or compressed. Stigmas 2, erect, nearly sessile. Seeds 
somewhat triangular. Calyx erect, 2 opposite sepals saccate at the base. 
29. Brassica. Pod rounded or angular, with a conical beak. Calyx erect. 
30. Sinapis. Pod rounded or angular, with a conical beak. Calyx spreading. 
31. Raphanus. Pod without valves, separating into several joints. 
Order VII. RESEDACE^E. 
1. Reseda. The only British genus. 
Order VIII. CISTACE.ZE. 
1. Helianthemum. The only British genus. 
Order IX. VIOLACEJE. 
1. Viola. The only British genus. 
Order X. DROSERACEiE. 
1. Drosera. The only British genus. 
Order XI. POLYGALACEiE. 
1. Polygala. The only British genus. 
Order XII. FRANKENIACE^E. 
1. Frankenia. The only British genus. 
Order XIII. CARYO PHY PLACED. 
1. Elatine. Sepals distinct. Capsule completely 3- or 4-cellcd, opening by 4 
valves. Stem creeping. 
* Calyx tubular. Stamens 10. 
2. Dianthus. Calyx with bracts beneath. 
3. Saponaria. Calyx without bracts, rounded. Styles 2. 
4. Cucubalus. Capsule fleshy, berry-like. 
5. Silene. Capsule dry, opening at the apex. Stvles 3 or 4. 
6. Lychnis. Capsule opening at the apex. Styles 5 Petals with a scale at the base. 
