Keys as per Flora of Bhutan
1. Leaves up to 1.5cm across, glabrous on upper surface; umbels 2-3mm diameter . . . . .. 3. H. sibthorpioides
+ Leaves more than 2cm across, usually pubescent on upper surface with thick hairs; umbels 4-15mm diameter . . . . .. 2
2. Leaves round in outline; umbels always solitary; fruiting pedicels more than 2mm . . . . .. .. 1. H. himalaica
+ Leaves somewhat angular in outline; umbels usually several in leaf axils; fruiting pedicels less than 2mm . .. 2. H. nepalensis
Hydrocotyle prolifera Kellogg (Introduced)
Hydrocotyle species in India:
Hydrocotyle (Araliaceae) page with images of species in efloraofindia : 1 post by 1 author.
If you find any mis-identification, pl. let us know. If anybody can send images of other species of this genera (for incorporation in the website), if any, it will be really nice.
Also, if anybody is interested to take up the activity of inserting images on efloraofindia pages from efloraofindia posts, pl. let us know.