Benghal dayflower

Commelina benghalensis L.

U.S. Nativity: Exotic
Habit: Herb

Synonym(s): tropical spiderwort, jio

Commelina benghalensis, or tropical spiderwort, is an annual or perennial, creeping herb that is on the Federal Noxious Weed List.
Leaves are alternate, lily-like, 1.2-2.8 in. (3-7 cm) long and often have reddish hairs towards the tip.
Aboveground flowers are very small with relatively large lilac to blue petals and are present from the spring into the fall. Underground flowers, which grow on burrowing rhizomes, are white and very small.
Fruits are ovoid capsules.
Ecological Threat
Commelina benghalensis invades areas with moist soil including roadsides, grasslands and other disturbed areas. It is especially problematic in pastures and crop fields where it forms dense, pure stands that can smother other plants such as low-growing crops. Commelina benghalensis is native to Asia and Africa and was first found in the United States in 1963.

Identification, Biology, Control and Management Resources

Domestic Programs Pest Evaluation - USDA APHIS PPQ
Federal Noxious Weed Inspection Guide - USDA APHIS PPQ
Managing Tropical Spiderwort in Roundup Ready Cotton - University of Georgia
Tropical Spiderwort Identification and Control in Georgia Field Crops - University of Georgia
Tropical Spiderwort Identification and Control - University of Florida
Pest Fact Sheet - North American Plant Protection Organization
Commelina sp. Identification Key - Flora of North America
Federal Noxious Weed Disseminules of the U.S. - USDA-APHIS
Benghal Dayflower a.k.a. Tropical Spiderwort: A New Weed in North Carolina - NCDA & CS