Hydrocotyle ranunculoides water pennywort Apiaceae R, ml (Zihao Wang; Torrey 2017);

Hydrocotyle ranunculoides.commons.wikimedia.org

Hydrocotyle ranunculoides.commons.wikimedia.org (Accessed 1/2016).

Hydrocotyle ranunculoides is a small perennial aquatic herb, stem slender, mostly prostrate, rooting at nodes. Forming mats of leaves on water surface.

Leaves round, kidney-shaped (reniform) or shield-shaped with stalk attached to center od leaf underside (peltate). Stipules scale-like.

Flowers white, small in small clusters or single.

Fruit dry, flattened side-to-side, rounded in outline (orbicular to ellipsoid).

Wetland status: OBL

Frequency in NYC: Very infrequent.

Origin: Native from S. NJ. south

Habitat: Shallow, still or slow moving water.

Notes: An invasive weed in parts of Europe and in Australia (Special edition of Environmental Weeds of Australia for Biosecurity Queensland, 2011, http://keyserver.lucidcentral.org/weeds/data) (Accessed 1/2016).