1	"Leaves opposite; flowers solitary, terminal; petals 4"	"Portulaca quadrifida"
1	"Leaves alternate or subopposite; flowers in terminal clustersl; petals 5 or more"	2
2	"Leaves usually spathulate or obovate-oblong; stipular hairs absent or minute; flowers surrounded by a 4-leaved involucre; sepals keeled; stamens 7-12"	"Portulaca oleracea"
2	"Leaves linear to linear-oblong; stipular hairs copious; flowers surrounded by an involcre of more than 4 leaves; sepals not keeled; stamens 20 or more"	3
3	"Roots tuberous, somewhat fusiform; petals lanceolate; capsules subgobose, apiculate; seeds lenticular"	"Portulaca tuberosa"
3	"Roots not tuberous; petals obovate; capsules oblong or ovoidl seeds reniform"	4
4	"Leaves subtereet, linear oblong; flowers 2-5 cm across; petals 5 or more, pale brown or yellow-spotted at the base, emarginate; seeds metallic grey or greyish black"	"Portulaca grandiflora"
4	"Leaves linear-lanceolate; flowers about 1 cm cross; petals only 5, not spotted at the base, obtuse; seeds dark brown to black"	"Portulaca pilosa"