Arnica acaulis (Walt.) Britton, Sterns, & Poggenb.

Weakley, Alan S., LeBlond, Richard J., McMillan, Patrick D., Sorrie, Bruce A., Poindexter, Derick B., Fuller, J. Brandon, Bridges, Edwin L., Budach, Brett J., Carr, Susan C., Crowl, Andrew A., Manos, Paul S., Fritsch, Peter W., Orzell, Steve L., Wipff, Joseph K., Messec, Lilly Anderson, Dellinger, Bob, Ungberg, Eric A., Yawn, Noah D., Cressler, Alan M., Oberholster, Chris, Barger, T. Wayne, Carter, J. Richard, Floden, Aaron J., Knapp, Wesley M., Copen, Iris, Jenkins, Amy M., Hughes, Ethan L., Annis, Jenna, Baker, Wilson & Mears, Randy L., 2024, Studies In The Vascular Flora Of The Southeastern United States. X, Journal of the Botanical Research Institute of Texas 18 (1), pp. 17-77 : 69

publication ID	https://doi.org/10.17348/jbrit.v18.i1.1338
DOI	https://doi.org/10.5281/zenodo.16922696
persistent identifier	https://treatment.plazi.org/id/0386DE00-FF96-A03F-FFB1-2A88A1D2FAE8
treatment provided by	Felipe
scientific name	Arnica acaulis (Walt.) Britton, Sterns, & Poggenb.
status

Treatment

Arnica acaulis (Walt.) Britton, Sterns, & Poggenb. View in CoL [ Asteraceae ] Leopardbane

Listed as an SH-S1/G4 taxon ( ALNHP 2023; Keener et al. 2023), Leopardbane had previously been collected only once [Houston Co., 7 May 2005, Kral 96213 (GA, TROY, USCH)] from Alabama, 18 years before the current collection. Due to the non-specific label data, the site of the original collection was unknown. Arnica acaulis has been considered historic in Alabama ( Keener et al. 2023) and an S1 ( ALNHP 2023), this collection removes doubt that the species should be considered extant for Alabama. More common in North Carolina, South Carolina, and Virginia, A. acaulis is thinly distributed from Alabama to Pennsylvania (Kartesz/BONAP 2024; Weakley & Southeastern Flora Team 2023).

Arnica acaulis is known to occur in a variety of open grassland habitats, including pine sandhills, sandy oak-pine woodlands, savannas, and, in the northern portions of its range, serpentine barrens. Associated species for this report include Chaptalia tomentosa Vent. , Drosera brevifolia Pursh , and Marshallia graminifolia (Walter) Small.

Voucher Specimen: ALABAMA. Houston Co.: Rare in dark, open, mucky soils of former wet pine-savanna, 22 Mar 2023, T. Wayne Barger 5944 ( ALNHS8050 View Materials ).