Taxonomic key of Peperomia in Sikkim Himalaya

1. Plant trailing; leaves abaxially pubescent.................................................................................................................... P. mangalbaria

- Plant erect; leaves abaxially glabrous.................................................................................................................................................2

2. Leaves alternate; cordate at base ....................................................................................................................................... P. pellucida

- Leaves opposite or whorled; base rounded, cuneate or attenuate ......................................................................................................3

3. Spikes finely pubescent; leaves broadly obovate or suborbicular.................................................................................. P. tetraphylla

- Spikes glabrous; leaves narrowly obovate or oblanceolate.............................................................................................. P. heyneana