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Flaigg, Norman G.
Senna roemeriana (Scheele) Irwin & Barneby
Twoleaf senna, Two leaved senna
Synonyms: Cassia roemeriana
USDA Symbol: sero8
USDA Native Status: Native to U.S.
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.
Plant CharacteristicsDuration: Perennial Habit: Shrub Fruit: Size Class:
Bloom InformationBloom Color: Yellow
Bloom Time: Aug , Sep , Oct
NM , OK , TX 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. USDA Native Status: L48(N)
Growing ConditionsWater Use: Low
Light Requirement: Part Shade
Soil Moisture: Dry
Cold Tolerant: yes
Heat Tolerant: yes
Soil Description: Dry, caliche or clay soils.
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:
Birds , Butterflies Larval Host:
Various Sulphur butterflies Nectar Source:
PropagationPropagation Material: Seeds
Seed Collection: Collect pods in late summer when they have turned brown and begun to dry, but before they split open.
Seed Treatment: Air-dry seeds after they have been removed and store in sealed containers.
Commercially Avail: yes
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Herbarium Specimen(s)NPSOT 0048
Collected May 4, 1990 in Bexar County by Lottie MillsapsNPSOT 0921
Collected Aug 27, 1994 in Bexar County by Mike FoxNPSOT 0295
Collected July 26, 1991 in Bexar County by Judith C. BerryNPSOT 0216
Collected May 6, 1992 in Comal County by Mary Beth White
Wildflower Center Seed BankLBJWC-41
Collected 2006-06-07 in Travis County by Lady Bird Johnson Wildflower Center
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Record Modified: 2009-04-21
Research By: TWC Staff