1	"Fruit obconic, 0.4--0.5 cm, 4--8-seeded; valves thick-leathery, tubercled near tip"	"Tropidocarpum californicum"
1	"Fruit linear or oblong, 0.9--7 cm, 25--70-seeded; valves thin-leathery, smooth throughout"	2
2	"Fruit oblong, 0.9--2 cm, (3)4--5 mm wide, length (1.6)2.8--5 × width; valves (2)4"	"Tropidocarpum capparideum"
2	"Fruit narrowly linear, (2.5)3--6(7) cm, 1.5--2(3) mm wide, length 13--46 × width; valves 2"	"Tropidocarpum gracile"