Seymeria cassioides
Yaupon black-senna or senna seymeria, Seymeria cassioides, is an annual plant native to North America. It is an obligate hemiparasite, relying on pine trees for nutrients while still making its own food from photosynthesis.
The plant grows up to about 1 meter tall and has glandular, hairy branches. Leaves are oppositely arranged, about 1 cm long, and divided into small leaflets (pinnate or bipinnate). The flowers are mainly yellow with a red stripe on each of the five petals and appear singly in the leaf axils. The fruit is a small oval capsule, 4–6 mm long.
Seymeria cassioides is found in the southeastern Coastal Plain of the United States, from Virginia to Florida and west to Texas, with some populations in the Bahamas. It favors habitats such as pine savannas, sandhills, and cypress swamps.
This page was last edited on 2 February 2026, at 06:17 (CET).