1	"Rhizomatous perennial; leaves all radical; alps and subalps"	"Trachymene humilis"
1	"Taprooted annuals or biennials; at least some leaves cauline; chiefly lowland plants"	2
2	"Umbels with 20 or more flowers; mericarps usually smooth, rarely bristly; widespread, erect annual or biennial 30–120 cm high"	3
2	"Umbels with fewer than 15 flowers; mericarps (at least one of each pair) hirsute; short-lived mallee annuals under 30 cm high"	4
3	"Margins of mericarps unwinged"	"Trachymene composita"
3	"Margins of mericarps with a pair of narrow crenate wings"	"Trachymene thysanocarpa"
4	"Umbels 3–6-flowered; petals bluish (rarely white); both mericarps hirsute to villous with purplish bristles"	"Trachymene cyanopetala"
4	"Umbels 6–12-flowered; petals white; one mericarp granular-rugose but glabrous, the other with retrorsely barbellate bristles"	"Trachymene pilosa"