Regularity: Regularly occurring
Localities documented in Tropicos sources
United States (North America)
Note: This information is based on publications available through Tropicos and may not represent the entire distribution. Tropicos does not categorize distributions as native or non-native.
- Hartman, R. L. & B. E. Nelson. 1998. Novelties from North America north of Mexico: A 20-Year Vascular plant Diversity Baseline. 1–51 (mss.). http://www.tropicos.org/Reference/11044
- Cantino, P. D. 1982. A monograph of the genus Physostegia (Labiatae). Contr. Gray Herb. 211: 1–105. http://www.tropicos.org/Reference/12233
Comments: Roadside ditches, marshes, hydric forest transitional zone between coastal prairie and mesic hardwood/pine flatwoods. A few populations are known to occur in natural communities such as open, moist prairies, thickets, and open areas along drainages and at the edges of mixed hardwood/pine flatwoods. Also grows in disturbed areas that simulate natural habitat, such as roadside ditches, along drainage canals, and in pipeline, powerline, and railroad rights-of-way.
Number of Occurrences
Note: For many non-migratory species, occurrences are roughly equivalent to populations.
Estimated Number of Occurrences: 21 - 80
National NatureServe Conservation Status
Rounded National Status Rank: N2 - Imperiled
NatureServe Conservation Status
Rounded Global Status Rank: G2 - Imperiled
Reasons: Restricted to the coastal prairie/pine flatwoods region of southwest Louisiana and southeastern Texas. The natural habitat has been altered by agricultural and silvicultural practices but populations appear to thrive in disturbed rights-of-way sites.
Degree of Threat: Medium
Comments: Most population are on roads, rights-of-way. Threatened by roadside development but only if severe. Chinese tallow tree encroachment is a threat.