[+][+][+] Pod linear, or oblong, or orbicular; valves 1-nerved or nerveless. Seeds in 2 rows (except in species of n. 4).
5. Arabis. Pod long-linear, the flat or flattish valves more or less 1-nerved. Seeds winged or wingless. Flowers white to purple. Stems leafy, at least below.
6. Draba. Pod oval to narrowly oblong or lanceolate; valves flat or flattish, faintly nerved or veined. Seeds wingless, numerous.
7. Alyssum. Pod orbicular; valves veinless, somewhat convex with flattened margin. Seeds wingless, 2–4.
[*][*] Pod terete or turgid, or 4-angled by the prominent midnerves. Seeds wingless, more or less turgid.
[+] Pods short. (See also n. 10.)
8. Lesquerella. Pod globular-inflated, about 4-seeded; valves nerveless. Cotyledons accumbent. Flowers yellow.
9. Camelina. Pod obovoid, many-seeded; valves 1-nerved; style slender. Cotyledons incumbent. Flowers yellow.
10. Subularia. Pod ovoid or globular, few-seeded, valves 1-nerved; style none. Cotyledons long, folded transversely. Flowers white. Dwarf stemless aquatic.