| 1 | 
  Siliculae hardly or not laterally compressed; septum broadly elliptic (sometimes incomplete or absent) | 
    | 
  (2) | 
  | + | 
  Siliculae laterally ± flattened or compressed (rarely with inflated valves) septum narrowly elliptic (sometimes absent) | 
    | 
  (4) | 
  |   | 
    | 
    | 
    | 
  | 2 (1) | 
  Racemes condensed, ± umbellate in fruit; valves gibbous with double crest at the back | 
    | 
   Dilophia | 
  | + | 
  Racemes elongated in fruit; valves neither gibbous nor double crested at the back | 
    | 
  (3) | 
  |   | 
    | 
    | 
    | 
  | 3 (2) | 
  Siliculae 2-seeded | 
    | 
   Winklera | 
  | + | 
  Siliculae many seeded | 
    | 
   Cochlearia | 
  |   | 
    | 
    | 
    | 
  | 4 (1) | 
  Siliculae bilobed; valves of each lobe inflated, globose or subglobose (neither keeled nor winged) | 
    | 
  (5) | 
  | + | 
  Siliculae ± compressed (rarely sub-inflated); valves boat shaped, ± keeled (winged or not) | 
    | 
  (6) | 
  |   | 
    | 
    | 
    | 
  | 5 (4) | 
  Valves membranous, smooth | 
    | 
   Didymophysa | 
  | + | 
  Valves rigid, rugose, ± pitted | 
    | 
   Coronopus | 
  |   | 
    | 
    | 
    | 
  | 6 (4) | 
  Siliculae unilocular, indehiscent | 
    | 
  (7) | 
  | + | 
  Siliculae bilocular, dehiscent (very rarely indehiscent), or breaking into two 1-seeded halves (rarely unilocular in some species of Aethionema ) | 
    | 
  (8) | 
  |   | 
    | 
    | 
    | 
  | 7 (6) | 
  Valves not coarsely veined; stigma sessile | 
    | 
   Isatis | 
  | + | 
  Valves coarsely veined in the middle; style short but distinct | 
    | 
   Sameraria | 
  |   | 
    | 
    | 
    | 
  | 8 (6) | 
  Siliculae breaking into two 1-seeded halves, or indehiscent (sometimes sub-dehiscent) | 
    | 
  (9) | 
  | + | 
  Siliculae dehiscent, usually leaving the seeds free | 
    | 
  (12) | 
  |   | 
    | 
    | 
    | 
  | 9 (8) | 
  Siliculae indehiscent (rarely subdehiscent) | 
    | 
  (10) | 
  | + | 
  Siliculae breaking longitudinally into two 1-seeded
halves | 
    | 
  (11) | 
  |   | 
    | 
    | 
    | 
  | 10 (9) | 
  Siliculae many seeded | 
    | 
   Hedinia | 
  | + | 
  Siliculae 1 or 2 seeded | 
    | 
   Cardaria | 
  |   | 
    | 
    | 
    | 
  | 11 (9) | 
  Plants robust; siliculae winged; stamens many (more then 6 in our spp.) | 
    | 
   Megacarpaea | 
  | + | 
  Plants short; siliculae not winged; stamens 6 | 
    | 
   Uranodactylus | 
  |   | 
    | 
    | 
    | 
  | 12 (8) | 
  Siliculae not winged, usually many seeded (more than 10 seeded); seeds very small | 
    | 
  (13) | 
  | + | 
  Siliculae ± winged (wings inconspicuous in some species of Lepidium and Thlaspi), usually 2 seeded; seeds large | 
    | 
  (14) | 
  |   | 
    | 
    | 
    | 
  | 13 (12) | 
  Plants erect, hairy with branched hairs; siliculae somewhat triangular | 
    | 
   Capsella | 
  | + | 
  Plants generally procumbent, tender, glabrous; siliculae elliptic or obovate-elliptic | 
    | 
   Hymenolobus | 
  |   | 
    | 
    | 
    | 
  | 14 (12) | 
  Flowers irregular, with two petals slightly  longer | 
    | 
   Iberis | 
  | + | 
  Flowers regular | 
    | 
  (15) | 
  |   | 
    | 
    | 
    | 
  | 15 (14) | 
  Siliculae slightly or obscurely winged towards the apex, small, ± rounded or ovate; style usually minute or almost absent | 
    | 
   Lepidium | 
  | + | 
  Siliculae usually distinctly winged (rarely wings almost supressed in some species of Thlaspi), usually
larger and longer than broad; style distinct | 
    | 
  (16) | 
  |   | 
    | 
    | 
    | 
  | 16 (15) | 
  Stamen filaments not appendaged; siliculae often elongated with entire margin or wings | 
    | 
   Thlaspi | 
  | + | 
  Filaments of the longer four stamens generally appendaged (not in our single species); siliculae ±
suborbicular with denticulate margin or wing (in our
species) | 
    | 
   Aethionema |