1	"Fruit a siliqua (length, excluding beak, more than 3 times width)."	2
1	"Fruit a silicula (length, excluding beak, less than 3 times width)."	30
2	"Fruit differentiated into valve and beak."	3
2	"Fruit with valve region only (style sometimes persistent, but not developed into a beak)."	9
3	"Seeds in 2 rows in each loculus."	4
3	"Seeds in 1 row in each loculus."	5
4	"Petals with purple veins; stigma 2-lobed; beak flattened, 5–10 mm long."	Eruca
4	"Petals without purple veins; stigma capitate; beak more or less conical, c. 2 mm long."	Diplotaxis
5	"Fruit indehiscent, mostly more than 4 mm wide, inflated or markedly constricted between seeds and breaking into 1-seeded units."	Raphanus
5	"Fruit dehiscent, usually less than 3 mm wide, not inflated, rarely more or less constricted between seeds and then not breaking into 1-seeded units."	6
6	"Valves with only 1 prominent vein or rarely venation obscure."	7
6	"Valves with 3 or more prominent veins."	8
7	"Valves angled; all leaves entire and stem-clasping."	Conringia
7	"Valves rounded; at least some leaves toothed or deeply lobed, or rarely some stem-clasping."	Brassica
8	"Fruit spreading; beak cylindrical, conical or flattened."	Sinapis
8	"Fruit appressed to stem; beak swollen."	Hirschfeldia
9	"Plants with simple hairs or plants glabrous."	10
9	"Plants with branched hairs."	19
10	"Septum absent; fruit less than 7 mm long."	Menkea
10	"Septum complete; fruit more than 10 mm long."	11
11	"Seeds mucilaginous when wet."	12
11	"Seeds not mucilaginous when wet."	14
12	"Plants growing west of the tablelands and stamens 6; seeds finely papillose; flowers white to yellow or rarely lavender."	Arabidella
12	"Plants either growing on the coast and tablelands and stamens 6 or growing further west and stamens 4; seeds not papillose; flowers always white."	13
13	"Basal leaves lobed or commonly more than 10 cm long; stem leaves sessile, sagittate."	Rorippa
13	"Basal leaves not persistent, lower stem leaves not lobed, mostly less than 8 cm long; upper stem leaves petiolate."	Irenepharsus
14	"Flowers usually white, sometimes pink or purple."	15
14	"Flowers yellow."	17
15	"Fruit valves more or less flat; dehiscence clock-spring-like; flowers white, pink or purple."	Cardamine
15	"Fruit valves convex; dehiscence not spring-like; flowers white."	16
16	"Leaves chiefly basal and lobed or leaves pinnate."	Rorippa
16	"Basal leaves not persistent, stem leaves simple and toothed but not lobed."	Irenepharsus
17	"Seeds in 2 rows per loculus."	Rorippa
17	"Seeds in 1 row per loculus."	18
18	"Valves with 3 veins apparent; testa not reticulate."	Sisymbrium
18	"Valves with only midvein distinct; testa reticulate."	Barbarea
19	"Seeds in 1 row in each loculus."	20
19	"Seeds in 2 rows in each loculus."	24
20	"Petals at least 10 mm long."	21
20	"Petals less than 10 mm long."	22
21	"Stigmatic lobes erect, each with dorsal swelling or horn."	Matthiola
21	"Stigmatic lobes spreading, without swelling or horn."	Cheiranthus
22	"Leaves 2–3-pinnatisect; petals yellow."	Descurainia
22	"Leaves entire to toothed; petals white."	23
23	"Midvein of fruit prominent; seeds c. 0.5 mm long; rosette usually present, leaves more or less spathulate, entire or finely toothed."	Arabidopsis
23	"Midvein of fruit indistinct towards apex; seeds 0.75 mm or more long; basal leaves not persistent, stem leaves more or less lanceolate to narrow-elliptic, coarsely toothed."	Irenepharsus
24	"Fruit more than 20 mm long."	25
24	"Fruit less than 20 mm long."	26
25	"Petals less than 8 mm long, yellow; plants more or less glabrous above, sparsely hairy below; basal leaves not lobed, upper leaves stem-clasping."	Turritis
25	"Petals more than 8 mm long, white to lavender; plants tomentose; basal leaves pinnatifid, upper leaves not stem-clasping."	Blennodia
26	"Fruit buried in the ground."	Geococcus
26	"Fruit aerial, not buried."	27
27	"Petals thread-like, not clawed."	Stenopetalum
27	"Petals obtuse, somewhat clawed."	28
28	"Fruit linear, petals white."	Pachymitus
28	"Fruit fusiform; petals yellow or with some lavender."	29
29	"Fruit densely hairy."	Harmsiodoxa
29	"Fruit glabrous or with a few scattered hairs."	Drabastrum
30	"Fruit distinctly differentiated into valve region and beak."	31
30	"Fruit not distinctly differentiated into valve region and beak."	33
31	"Beak flattened and spoon-like."	Carrichtera
31	"Beak rounded to conical."	32
32	"Fruit more than 10 mm long; succulent herbs confined to seashores."	Cakile
32	"Fruit less than 10 mm long; not succulent, widespread weeds."	Rapistrum
33	"Fruit with 1 seed per loculus."	34
33	"Fruit with more than 1 seed per loculus."	37
34	"Fruit with a wide septum and more or less flat valves."	Lobularia
34	"Fruit with a narrow septum and keeled valves."	35
35	"Fruit dehiscent."	Lepidium
35	"Fruit indehiscent but sometimes breaking into 1-seeded units."	36
36	"Fruit pitted; leaves pinnatisect, lobes linear."	Coronopus
36	"Fruit smooth; leaves more or less oblanceolate, entire or almost so."	Cardaria
37	"Fruit with a narrow septum; valves winged or more or less keeled."	38
37	"Fruit with a broad septum; valves neither winged nor keeled."	41
38	"Fruit more or less obcordate; simple and stellate hairs present."	Capsella
38	"Fruit more or less globose to elliptic; plants glabrous or hairy, hairs not stellate."	39
39	"Fruit c. 10 mm diam;, winged and deeply notched."	Thlaspi
39	"Fruit less than 5 mm diam., neither prominently winged nor markedly notched at apex."	40
40	"Fruit more or less globose, less than 5 mm long; basal leaves not persistent; plants glabrous or with simple hairs only."	Cuphonotus
40	"Fruit ovate, more than 5 mm long; basal leaves persistent; plants hairy, all hairs bifid."	Phlegmatospermum
41	"Fruit either more than 2 cm wide or more or less buried in the ground."	42
41	"Fruit less than 1 cm wide and aerial."	43
42	"Fruit more than 2 cm wide, aerial."	Lunaria
42	"Fruit less than 1 cm wide, buried in the ground."	Geococcus
43	"Septum absent."	Menkea
43	"Septum complete."	44
44	"Petals thread-like, acute or deeply bifid."	45
44	"Petals somewhat obtuse or emarginate."	46
45	"Petals entire and/or acute; basal leaves usually deeply lobed, sometimes lanceolate."	Stenopetalum
45	"Petals bifid; basal leaves more or less spathulate."	Erophila
46	"Hairs stellate, appressed; staminal filaments with appendages."	Alyssum
46	"Hairs absent or present, if stellate not appressed; staminal filaments without appendages."	47
47	"Hairs absent or all simple."	Rorippa
47	"Hairs present, at least some branched."	48
48	"Either all leaves sessile or petiole winged; base auriculate; basal leaves not in a rosette."	Camelina
48	"Some or all leaves petiolate, petiole not winged; base various; basal leaves in a rosette"	Drabastrum