1	"Plants shrubby climbers, with tendrils; ochreae absent"	"Antigonon {Antigonon leptopus}"
1	"Plants erect herbs, without tendrils; ochreae present"	2
2	"Tepals 6, in 2 series of 3, the inner greatly enlarging in fruit"	Rumex
2	"Tepals 4-5, petaloid, the inner not enlarging in fruit"	3
3	"Fruits winged or with prickles; flowers heterostylous, bisexual or staminate"	Oxygonum
3	"Fruits not winged and without prickles; flowers nor heterostylous always bisexual"	Persicaria