Lady Bird Johnson Wildflower Center - The University of Texas at Austin information

 Native Plant Database

Senna roemeriana

Twoleaf senna, Two leaved senna

Fabaceae (Pea Family)

Senna roemeriana (Twoleaf senna)
Flaigg, Norman G.
This attractive perennial maintains a neat mound shape and grows 1-2 ft. tall. Its showy, yellow, pea-like flowers occur in upper axillary clusters. The leaves are long-stalked and uniquely divided into two leaflets about 1 1/2 inches long.

Named for Ferdinand Roemer, a German geologist who collected specimens in the New Braunfels, Texas, area from 1845-47.

Image Gallery:

34 photo(s) available

Plant Characteristics

Duration: Perennial
Habit: Shrub
Size Class: 1-3 ft.

Bloom Information

Bloom Color: Yellow
Bloom Time: Aug , Sep , Oct


Native Distribution: S. & w. TX, NM & n. Mex
Native Habitat: Fields; open woods, Common in fields, and open woods of central and west Texas. Well-drained limestone soils.

Growing Conditions

Water Use: Low
Light Requirement: Part Shade
Soil Moisture: Dry
Cold Tolerant: yes
Heat Tolerant: yes
Soil Description: Dry, caliche or clay soils.


Use Wildlife: Seeds provide an important source of food for birds.
Warning: Plants of this genus (and herbal remedies derived from them) can cause poisoning and fatal illness in humans. Sensitivity to a toxin varies with a personís age, weight, physical condition, and individual susceptibility. Children are most vulnerable because of their curiosity and small size. Toxicity can vary in a plant according to season, the plantís different parts, and its stage of growth; and plants can absorb toxic substances, such as herbicides, pesticides, and pollutants from the water, air, and soil.
Conspicuous Flowers: yes
Attracts: Birds , Butterflies
Larval Host: Various Sulphur butterflies
Nectar Source: yes
Deer Resistant: High

Last Update: 2009-04-21