16 
6. CRUCIFERS. 
3. Nasturtium. Pod nearly cylindrical, short : valves con- 
vex, almost nerveless. Stigma capitate. Seeds irregularly in 
2 rows. — The short-podded speeies ( JV. amphibium)is seareely 
distinguishable generically from Armoracia. 
4. Barbarea. Pod terete : valves convex with a prominent 
longitudinal nerve. Stigma capitate. Seeds in a single row. 
5. Turritis. Pod eompressed : valves slightly convex with 
a prominent longitudinal nerve. Stigma eapitate. Seeds in 
2 rows. 
G. Arabis. Pod eompressed : valves nearly flat with a pro- 
minent longitudinal nerve, or rarely nerveless with nume- 
rous longitudinal veins. Stigma obtuse. Seeds in a single 
row. 
7. Cardamine. Pod eompressed : valves fiat, nerveless. 
Stigma eapitate. Seeds in a single row : funieulus simple. 
Aliform. 
8. Dentaria. Pod lanceolate, eompressed : valves flat, neiwe- 
less. Stigma cajiitate. Seeds in a single row : funiculus 
dilated, winged. 
Tr. II. SISYMBRE.^. Cotyledons incumbent eontrary to the 
dissepiment, rachele dorsal, seed eompressed. 
y. IIesperi.s. Pod quadrangular or subcompressed; valves 
keeled, somewhat 3-nerved. Stigma of 2 closely converging 
erect elliptical obtuse lobes. Seeds in a single row. 
10. Sisymbrium. Pod terete, or rarely tetragonal: valves 
convex, with 3 longitiuhnal nerves. Stigma entire. Seeds 
in a single row, smooth : funieulus filiform. — S. thalianum 
has its pod tetragonal with the valves angularly keeled and 
the lateral nerves very slender. 
11. Alliaria. Pod terete: valves eonvex, with 3 longitu- 
dinal nerves, the middle one prominent and strong, the 2 
lateral slender and branching. Stigma entire. Seeds in a 
single row, striated : funiculus fattened, winged. 
12. Erysimum. Pod tetragonal : valves \yrommcnt\y keeled, 
with 1 longitudinal nerve. Stigma obtuse, entire or slightly 
emarginate. Seeds in a single row : funieulus filiform. 
Tr. III. BRASSICEjE. Cotyledons conduplicate longitiuh- 
iially folded in the middle : rathele dorsal, within the fold. 
13. Brassica. Pod terete : valves convex with owe 
dorsal nerve, lateral nerves none or represented by a few 
anastomosing veins. Seeds globose, in a single row. 
