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)
Cressler, Alan
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:

35 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: 2015-02-19