CRUCIFER/T.. 
15 
1. Matthiola. Pod round or compre ssed. Stigma 2-lobcd : 
lobes erect gibbous or horned at the back. 
2. Cheirantiius. Pod compressed or 2-edged, with an ele- 
vated longitudinal nerve upon each valve. Stigma 2-lobcd : 
lobes patent. Seeds in a single row in each cell. 
3. Nasturtium. Pod nearly cylindrical, short : valves con- 
vex, almost nerveless. Stigma capitate. Seeds irregularly in 
2 rows. — -The short-podded species (JV. amphibium) is scarcely 
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 compressed: valves slightly convex with 
a prominent longitudinal nerve. Stigma capitate. Seeds in 
2 rows. 
6. Arabis. Pod compressed : 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 compressed : valves fat, nerveless. 
Stigma capitate. Seeds in a single row : funiculus simple, 
filiform. 
8. Dentaria. Pod lanceolate, compressed : valves flat, nerve- 
less. Stigma capitate. Seeds in a single row : funiculus 
dilated, winged. 
Tr. II. SISYMBREJE. Cotyledons incumbent contrary to 
the dissepiment, radicle dorsal, seed compressed. 
9. Hesperis. 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 longitudinal nerves. Stigma entire. Seeds 
in a single row, smooth : funiculus filiform. — S. thalianum 
has its pod tetragonal with the valves angularly keeled and 
the lateral nerves very slender. 
11. Alliaria. Pod terete: valves convex, 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 prominently keeled, 
with 1 longitudinal nerve. Stigma obtuse, entire or slightly 
emarginate. Seeds in a single row : funiculus filiform. 
Tr. III. BRASSICEjE. Cotyledons conduplicate longitudi- 
nally folded in the middle : radicle dorsal, within the fold. 
