

Rat's Ear Commelina forskaolii
Rat's Ear is an introduced annual herb, found in the lower 48 states.
More about this plant
Commelina forskaolii, sometimes known as rat's ear, is an herbaceous plant in the dayflower family native to much of Africa, Arabia, and India. It has also been introduced to Florida in the United States. It is considered a common species in most of its range. It can be easily recognized by its bright blue flowers with winged stamen filaments. The seeds are also distinctive with distinctive irregular ridges on their sides. It often forms dense mats, and can be found most commonly in sandy soils in at least somewhat sunny situations. The species is considered a weed in many areas because of its hardiness and ability to produce cleistogamous flowers. Wikipedia →
Growing & care
USDA PLANTS · TRY- Hardiness
- ≥ zone 11 derived from its U.S. range
- Lifespan
- Annual
Wildlife & pollinators
How pollinator value is scored →❧ Caterpillar hosts ~2 caterpillar species
Commelina supports ~2 caterpillar species.
Native butterfly & moth caterpillars are the base of the terrestrial food web — most songbirds rear their young almost entirely on them. As a host for native Lepidoptera this is a modest genus.
Recorded feeding on Commelina in North America, including:
Wildlife & visitors 1 mammal
Open records of who else uses Rat's Ear — a generalist food-web signal, kept separate from the keystone Ecological Value.
Recorded eaten by 1 mammal species (fruit, seed, browse):
Sources for this entry (12) Open & cited
Cite this page Open data, please attribute
PlantKey’s data is open under CC BY-SA 4.0 — free to reuse and adapt, with attribution and the same licence. Photos keep their own per-image licence + credit (see Sources above).
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