Dollar Weed, Dollar Vine, Marsh Pennywort, Sombrerillo

Hydrocotyle bonariensis

Family: Apiaceae

Plant Description: Perennial to 35 cm high with creeping stems, rooting at the nodes and forming mats. Leaves peltate, roundish, or broader than long, usually 3-8 cm wide, alternate. Flowers in compound umbels, petioles attached to the center of the leaf. Petals 1-1.5 mm long, whitish to pale yellow.

Field Identification: This plant is easily identified by its habit and its habitat. It propagates by rooting at nodes just below the ground surface. it is a plat with circular leaves with a petiole attached at the leaf center. Flowers inflorescent is an umbel. it is low growing and found in moist sands.

Plant Trivia: Spanish refers to the leaf meaning “little hat.”

Occurrence: Common on coastal sands in swales, depressions, marshes, and other moist areas.

Bloom Period: Mar-Nov

Plant Use: Attractive ground cover and common in low coastal regions. It is aggressive.

Key to the Genus Hydrocotyle:

  1. Flowers in a simple umbel…………………………………….H. umbellata

             Flowers in a compound umbel or an interrupted spike……….2

          2. Inflorescence a compound umbel……………………..H. bonariensis

              Inflorescence a simple or branched spike………….H. verticillata