Gelsemium sempervirens is a twining vine in the family Gelsemiaceae, native to subtropical and tropical America: Honduras, Guatemala, Belize, Mexico (Chiapas, Oaxaca, Veracruz, Puebla, Hidalgo), and southeastern and south-central United States (from Texas to Virginia). It has a number of common names including yellow jessamine or jasmine, Carolina jasmine or jessamine, evening trumpetflower, gelsemium and woodbine.
Gelsemium sempervirens can grow to 3–6 m (10–20 ft) high when given suitable climbing support in trees, with thin stems. The plant is perennial. The leaves are evergreen, lanceolate, 5–10 cm (2–4 in) long and 1–1.5 cm (3⁄8–5⁄8 in) broad, and lustrous, dark green. The flowers are borne in clusters, the individual flowers yellow, sometimes with an orange center, trumpet-shaped, 3 cm (1+1⁄4 in) long and 2.5–3 cm (1–1+1⁄4 in) broad. Its flowers are strongly scented and produce nectar that attracts a range of pollinators.
Some 19th century sources identified Gelsemium sempervirens as a folk remedy for various medical conditions.
All parts of this plant contain the toxic strychnine-related alkaloids gelsemine and gelseminine and should not be consumed. The sap may cause skin irritation in sensitive individuals. Children, mistaking this flower for honeysuckle, have been poisoned by sucking the nectar from the flower. The nectar is also toxic to honeybees, which may cause brood death when gathered by the bees. The nectar may, however, be beneficial to bumblebees. It has been shown that bumblebees fed on gelsemine have a reduced load of Crithidia bombi in their fecal matter after 7 days, although this difference was not significant after 10 days. Reduced parasite load increases foraging efficiency, and pollinators may selectively collect otherwise toxic secondary metabolites as a means of self-medication.
The plant can be lethal to livestock.
Despite the hazards, this is a popular garden plant in warmer areas, frequently being trained to grow over arbors or to cover walls. In the UK, it has won the Royal Horticultural Society's Award of Garden Merit. It can be grown outdoors in mild and coastal areas of the UK (to a lower limit of −5 °C (23 °F)), but elsewhere must be grown under glass. It requires a sheltered position in full sun or light shade.
- "NatureServe Explorer 2.0". explorer.natureserve.org. Retrieved 23 December 2022.
- Tropicos, search for Gelsemium sempervirens
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- Biota of North America Program 2014 county distribution map
- "Gelsemium sempervirens". Atlas of Florida Vascular Plants. University of South Florida. Retrieved 2008-02-12.
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- "South Carolina State Flower | Yellow Jessamine". statesymbolsusa.org. Retrieved 2019-10-15.
- USDA, NRCS (n.d.). "Gelsemium sempervirens". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 12 December 2022.
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- Anthony Knight and Richard Walter. 2001. A Guide to Plant Poisoning of Animals in North America.
-  "Nectar Gardening for Butterflies, Honey Bees and Native Bees", Retrieved 2012-08-02
- "Manson, J.S., Otterstatter, M.C., Thomson, J.D. "Consumption of a nectar alkaloid reduces pathogen load in bumble bees". 27 August 2009: Oecologia 162:81-89. Retrieved 2013" (PDF). Archived from the original (PDF) on 4 March 2016. Retrieved 13 September 2013.
- Niering, William A.; Olmstead, Nancy C. (1985) . The Audubon Society Field Guide to North American Wildflowers, Eastern Region. Knopf. p. 619. ISBN 0-394-50432-1.
- "Gelsemium sempervirens". www.rhs.org. Royal Horticultural Society. Retrieved 9 July 2020.
- Chisholm, Hugh, ed. (1911). Encyclopædia Britannica. Vol. 11 (11th ed.). Cambridge University Press. p. 559. This contains a detailed description of the then-common usage and dosage of the drug. .