Vegetative key to the families

EPIPHYTES on trees or rocks
Leaves with reticulate venation, or the venation obscure
Leaves opposite or whorled
Leaves sometimes whorled, succulent, c. 3 cm long or less Piperaceae
Small succulent herbs. Leaves opposite or whorled Peperomia
Leaves opposite, ovate-elliptic, 1–3 cm long, shortly pubescent, thick, fleshy. Spikes mostly 5–8 cm long. Coast and adjacent plateaus. On rocks in WSF and RF Peperomia blandafloribunda
Leaves in whorls of 4, glabrous or nearly so, shining, ovate-rhomboidal, 5–15 mm long, thick, hard. Spikes 1–3 cm long. Woronora Plateau; Blue Mts On rocks and tree trunks in or near RF Peperomia tetraphylla