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Genus

Hydrocotyle

Called “water pennywort” in GBIF

Hydrocotyle, also called floating pennywort, water pennywort, dollar weed, marsh penny, thick-leaved pennywort and white rot, is a genus of prostrate, perennial aquatic or semi-aquatic plants formerly classified in the family Apiaceae, now in the family Araliaceae.

From Wikipedia, licensed under CC BY-SA 4.0

199
accepted species in GBIF
Source: GBIF
2
plants on Plant News
2
research articles
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What science is finding about Hydrocotyle

Every article on Plant News that mentions a member of this genus, newest first.

Latest finding

Connected plant runners reshape soil microbes near toxic cadmium

A marsh plant that spreads by runners shares resources between its connected offshoots, and when one end sits in cadmium-contaminated soil, that connection changes which bacteria and fungi set up shop in the roots of both ends. This hints at a hidden way plants recruit helpful microbes to cope with pollution.

Invasive floating pennywort confirmed spreading in an Oregon waterway

If you fish, kayak, or garden near a pond in the Willamette Valley, this mat-forming invader can clog waterways and crowd out...

floating marsh pennywort invasive-species / urban-ecology