CABBAGE FAMILY 33 



6. Cardamine. — Pod flat; valves veinless, separating with an 

 elastic spring ; seeds i -seriate, on thread-like stalks. 



7. Dentaria. — Similar, but with dilated, winged seed-stalks. 



Tribe 2. Sisymbrice. Seeds \-seriate ; cotyledons incumbent 



*8. Hesperis.— Stigma 2-lobed, decurrent ; pod 4-angled ; 

 valves keeled, 3-veined ; hairs spreading. 



9. Sisymbrium. — Stigma undivided ; pod cylindric or 4-angled ; 

 valves convex, 1 — 3-veined ; hairs spreading, or absent ; seed- 

 stalks thread-like. 



10. Alliaria. — Similar, but with flattened, winged seed-stalks. 



1 1. Erysimum. — Stigma undivided, or notched ; pod 4-angled j 

 valves keeled, 1 -veined ; hairs adpressed, forked. 



Tribe 3. Brdssicea. Cotyledons incumbent, folded longitudinally ; 

 flowers yellow 



12. Brassica. — Sepals erect; pod nearly cylindric; seeds 1- 

 seriate. 



13. Sinapis. — Sepals spreading ; pod nearly cylindric ; seeds 1- 

 seriate. 



14. DiplotAxis. — Pod compressed ; seeds 2-seriate. 



Sub-order II. Latiseptce. Fruit a latisept silicle 

 Tribe 4. Alyssineai. Cotyledons accumbent 



*i5. Alyssum. — Petals entire; pod roundish, compressed, 

 few-seeded. 



16. Draba. — Petals entire or 2-cleft ; pod oval or oblong, com- 

 pressed or turgid; seeds numerous, 2-seriate. 



17. Cochlearia. — Petals entire; pod globose or nearly so ; 

 valves very convex, keeled ; seeds numerous, 2-seriate. 



18. Armoracia. — Similar, but with no dorsal vein to the valves 

 of the pod. 



Tribe 5. Camelinea. Cotyledons incumbent 

 *i9- CAMEiiNA. — A tall herb, with cauline leaves, sessile, 

 auricled ; pod ovate, inflated, beaked ; style persistent. 



20. SubulAria. — A small aquatic plant ; leaves subulate ; pod 

 oval-oblong ; valves boat-shaped ; seeds numerous. 



Sub-order III. Angustiseptce. Fruit an angustisept silicle 

 Tribe 6. lepidinece. Cotyledons incumbent ; flowers white 



21. Capsella. — Pod inversely heart-shaped, flat; valves boat- 

 shaped, keeled ; seeds many. 



D 



