Trichostema setaceum

Trichostema setaceum
Conservation status
Secure  (NatureServe) [1]
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Asterids
Order:	Lamiales
Family:	Lamiaceae
Genus:	Trichostema
Species:	T. setaceum
Binomial name
Trichostema setaceum Houtt.
Synonyms [2]
Trichostema lineare(Walter) Trichostema dichotomum L. var. lineare(Walter) Pursh

Trichostema setaceum is an herbaceous flowering plant. Commonly referred to as narrowleaf bluecurls, it is in the Lamiaceae (mint family). ^[3] It grows in sandy soil, sandhills, and rocky uplands. ^[4]

Description

Narrowleaf bluecurls is an annual growing to 50 cm (20 in). Stunning purple-blue flowers are borne from September to October. The stamens extend far beyond the petals, growing up to 20 mm (0.79 in). ^[5] The leaves of T. setaceum are toothed or entire. ^[6]

Conservation

It is listed as endangered in Kentucky, New York, Ohio, and Pennsylvania. ^[7] It is critically imperiled in Missouri. ^[5]

References

1. "Trichostema setaceum". NatureServe Explorer. Retrieved 22 August 2025.
2. "Plants Profile for Trichostema setaceum (narrowleaf bluecurls)". plants.usda.gov.
3. "Lady Bird Johnson Wildflower Center - The University of Texas at Austin". www.wildflower.org. Retrieved 2020-03-01.
4. "Trichostema setaceum page". www.alabamaplants.com. Retrieved 2020-03-01.
5. "Trichostema setaceum page". www.missouriplants.com. Retrieved 2020-03-01.
6. Radford, Albert E., Harry E. Ahles, and C. Ritchie Bell. Manual of the Vascular Flora of the Carolinas. 1964, 1968. The University of North Carolina Press. 897. Print.
7. "Plants Profile for Trichostema setaceum (narrowleaf bluecurls)". plants.usda.gov. Retrieved 2020-03-01.