Tropaeolum L.
Prostrate or scandent herbs. Roots sometimes tuberous. Fls mostly yellow to scarlet, sometimes blue or purplish. Fr. of 3 indehiscent carpels, never winged.
Key
2
Distal part of calyx spur tapering; petals 5, exserted from calyx, the limb > 1 cm long
Distal part of calyx spur swollen; petals 2, included in calyx, the limb < 0.5 mm long
50-100 spp., America, from Mexico southwards, especially in the Andes. Naturalised spp. 3.