1	"Fruit a siliqua (length, excluding beak, at least three times width)"	2
1	"Fruit a silicula (length, excluding beak, less than three times width)"	33
2	"Siliqua differentiated into valve and beak; cotyledons conduplicate"	3
2	"Siliqua with valve region only (style persistent or not, but not developed into a beak); cotyledons not conduplicate"	9
3	"Seeds in two rows in each locule"	4
3	"Seeds in one row in each locule"	5
4	"Petals without purple veins; stigma capitate; beak conical to 2-edged"	Diplotaxis
4	"Petals with purple veins; stigma bilobed; beak sabre-like"	"Eruca {Eruca sativa}"
5	"Siliqua indehiscent, constricted between seeds, often breaking into 1-seeded units"	Raphanus
5	"Siliqua dehiscent, not constricted between seeds, not breaking into 1-seeded units"	6
6	"Valves with one prominent midvein"	7
6	"Valves with three or more prominent veins"	8
7	"Valves rounded; at least some leaves not entire or stem-clasping"	Brassica
7	"Valves slightly keeled; all leaves entire and stem-clasping"	"Conringia {Conringia orientalis}"
8	"Siliqua appressed to stem; beak swollen"	"Hirschfeldia {Hirschfeldia incana}"
8	"Siliqua spreading; beak cylindrical, conical or sabre-like"	Sinapis
9	"Plants with simple hairs, or glabrous"	10
9	"Plants with branched hairs"	19
10	"Seeds with incumbent radicle"	11
10	"Seeds with accumbent radicle"	16
11	"Siliqua constricted between seeds at replum margin"	Heliophila
11	"Siliqua not constricted between seeds at replum margin"	12
12	"Septum incomplete or absent"	Menkea
12	"Septum complete"	13
13	"Seeds mucous"	14
13	"Seeds not mucous"	15
14	"Seeds finely papillose"	Arabidella
14	"Seeds finely reticulate"	Irenepharsus
15	"Valves with 1 indistinct vein"	Irenepharsus
15	"Valves with 3 veins"	Sisymbrium
16	"Siliqua valves flat"	17
16	"Siliqua valves convex"	18
17	"Valves with no distinct veins; replum margin flanged"	Cardamine
17	"Valves with distinct midvein; replum margin not flanged"	"Cheesemania {Cheesemania radicata}"
18	"Valves with midvein distinct to apex"	Barbarea
18	"Valves with midvein fading below apex"	Rorippa
19	"Seeds in one row in each locule"	20
19	"Seeds in two rows in each locule"	25
20	"Petals 10 mm long or longer"	21
20	"Petals less than 10 mm long"	23
21	"Stigma not deeply bilobed"	"Erysimum {Erysimum repandum}"
21	"Stigma deeply bilobed"	22
22	"Stigmatic lobes spreading, without swelling or horn"	Erysimum
22	"Stigmatic lobes erect, each with dorsal swelling or horn"	Matthiola
23	"Leaves bi- to tri-pinnatisect; petals yellow"	"Descurainia {Descurainia sophia}"
23	"Leaves entire to dentate; petals white"	24
24	"Midvein of siliqua prominent; seeds c. 0.5 mm long"	"Arabidopsis {Arabidopsis thaliana}"
24	"Midvein of siliqua indistinct towards apex; seeds 0.75 mm or more long"	Irenepharsus
25	"Siliqua 2 cm long or longer"	26
25	"Siliqua less than 2 cm long"	28
26	"Stigma deeply bilobed"	"Malcolmia {Malcolmia flexuosa}"
26	"Stigma not deeply bilobed"	27
27	"Petals more than 8 mm long, white to lavender"	Blennodia
27	"Petals less than 8 mm long, yellow"	"Turritis {Turritis glabra}"
28	"Siliqua subterranean"	"Geococcus {Geococcus pusillus}"
28	"Siliqua aerial"	29
29	"Petals thread-like, not clawed"	Stenopetalum
29	"Petals obtuse, somewhat clawed"	30
30	"Siliqua linear; petals white"	"Pachymitus {Pachymitus cardaminoides}"
30	"Siliqua fusiform; petals yellow or with some lavender"	31
31	"Pedicels recurved; petals yellow"	"Scambopus {Scambopus curvipes}"
31	"Pedicels erect to spreading; petals with some lavender"	32
32	"Siliqua glabrous or with a few scattered hairs"	"Drabastrum {Drabaastrum  alpestre}"
32	"Siliqua densely hairy"	Harmsiodoxa
33	"Silicula distinctly differentiated into 2 parts (valve region and beak)"	34
33	"Silicula not distinctly differentiated into valve region and beak"	38
34	"Beak flattened and leaf-like"	"Carrichtera {Carrichtera annua}"
34	"Beak rounded to conical"	35
35	"Silicula more than 10 mm long"	Cakile
35	"Silicula less than 10 mm long"	36
36	"Beak or upper segment containing seeds"	"Rapistrum {Rapistrum rugosum subsp. rugosum}"
36	"Beak seedless"	37
37	"Plant glabrous; silicula obcordate"	"Myagrum {Myagrum perfoliatum}"
37	"Plant hairy; silicula not obcordate"	"Euclidium {Euclidium syriacum}"
38	"Silicula with one seed per locule"	39
38	"Silicula with more than one seed per locule"	41
39	"Silicula with a narrow septum and keeled valves"	Lepidium
39	"Silicula with a broad septum and flat or rounded valves"	40
40	"Silicula flattened"	"Lobularia {Lobularia maritima}"
40	"Silicula globose"	"Neslia {Neslia paniculata}"
41	"Silicula with a narrow replum; valves winged or keeled"	42
41	"Silicula with a broad replum; valves not winged or keeled"	50
42	"Plants glabrous or with simple hairs only"	43
42	"Plants hairy, at least some of the hairs branched"	48
43	"Silicula keeled"	44
43	"Silicula winged"	46
44	"Seeds many, up to 70 per locule"	"Carinavalva {Carinavalva glauca}"
44	"Seeds few, 12 or less per locule"	45
45	"Silicula round; branching of the stem not zigzag"	Cuphonotus
45	"Silicula elongate; branching of stem zigzag"	"Hornungia {Hornungia procumbens}"
46	"Petals 2 long and 2 short"	"Teesdalia {Teesdalia nudicaulis}"
46	"Petals all similar, or absent"	47
47	"Petals absent"	Microlepidium
47	"Petals present"	"Thlaspi {Thlaspi arvense}"
48	"Hairs all bifid"	Phlegmatospermum
48	"Simple and stellate hairs present"	49
49	"Silicula more than 5 mm long"	"Capsella {Capsella bursa-pastoris}"
49	"Silicula less than 5 mm long"	Microlepidium
50	"Petals threadlike, acute, or bifid"	51
50	"Petals somewhat obtuse (or emarginate), entire"	52
51	"Petals bifid"	"Erophila {Erophila verna}"
51	"Petals entire, threadlike and/or acute"	Stenopetalum
52	"Silicula with septum incomplete or absent"	Menkea
52	"Silicula with septum complete"	53
53	"Silicula subterranean"	"Geococcus {Geococcus pusillus}"
53	"Silicula aerial"	54
54	"Staminal filaments with appendage; hairs stellate, appressed"	Alyssum
54	"Staminal filaments without appendage; hairs, if stellate, not appressed"	55
55	"Hairs absent or all simple"	56
55	"Hairs present, at least some branched"	57
56	"Valves flat"	"Lunaria {Lunaria annua}"
56	"Valves convex"	Rorippa
57	"Leaves all sessile, or winged-petiolate; bases auriculate"	Camelina
57	"Some or all leaves petiolate, petioles not winged; bases various"	58
58	"Petals more than 4 mm long"	"Drabastrum {Drabastrum alpestre}"
58	"Petals less than 4 mm long"	59
59	"Seeds up to 6 per loculus"	"Ballantinia {Ballantinia antipoda}"
59	"Seeds more than 6 per loculus"	"Draba {Draba nemorosa}"