# Psilactis

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***Psilactis*** is a genus of [North American](/source/North_America) and [South American](/source/South_America) plants in the tribe [Astereae](/source/Astereae) within the family [Asteraceae](/source/Asteraceae) which are known by the common name **tansyaster**.[3] There are six species within the genus.

## Taxonomy

The genus contains six species: *[Psilactis asteroides](/source/Psilactis_asteroides)*, *[Psilactis brevilingulata](/source/Psilactis_brevilingulata)*, *[Psilactis gentryi](/source/Psilactis_gentryi)*, *[Psilactis heterocarpa](/source/Psilactis_heterocarpa)*, *[Psilactis odysseus](/source/Psilactis_odysseus)*, and *[Psilactis tenuis](/source/Psilactis_tenuis)*.[4] Formerly included in the genus were *Psilactis coulteri* and *Psilactis crispa* which are now placed in genus *[Leucosyris](/source/Leucosyris)* as *[L. coulteri](/source/Leucosyris_coulteri)*[5] and *[L. crispa](/source/Leucosyris_crispa)*,[6] respectively. Additionally, *Psilactis lepta* has been determined to be a [taxonymic synonym](/source/Synonym_(taxonomy)) of *Psilactis asteroides*.[7]

## Distribution

Five species within the genus have [native](/source/Native_plant) distribution in [Mexico](/source/Mexico). *Psilactis heterocarpa* is restricted to [Texas](/source/Texas) in the [United States](/source/United_States) with no Mexican distribution.[8] *P. odysseus* is restricted to the Mexican states [Nuevo León](/source/Nuevo_Le%C3%B3n) and [Tamaulipas](/source/Tamaulipas),[9] and the other four species, *P. asteroides*,[10] *P. brevilingulata*,[11] *P. gentryi*,[12] and *P. tenuis*[13] have distributions in both Mexico and the United States. *P. brevilingulata* has an additional presence in [Colombia](/source/Colombia) and [Peru](/source/Peru).[11]

## Citations

1. Lectotype designated by Pfeiffer, L.K.G. 1874. *Nomenclator Botanicus* **2**(2): 857.

1. [Tropicos, *Psilactis* A. Gray](http://www.tropicos.org/Name/40018794)

1. USDA 2014.

1. POWO 2021.

1. POWO 2021, pp. [*Psilactis coulteri* A.Gray](https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:212008–2).

1. POWO 2021, pp. [*Psilactis crispa* Brandegee](https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:212009–2).

1. POWO 2021, pp. [*Psilactis lepta* Shinners](https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:212010–2).

1. Hassler 2021, [*Psilactis heterocarpa* (R. L. Hartm. & M. A. Lane) D. R. Morgan](https://www.catalogueoflife.org/data/taxon/4PGCL).

1. Hassler 2021, [*Psilactis odysseus* (G. L. Nesom) D. R. Morgan](https://www.catalogueoflife.org/data/taxon/4PGCN).

1. Hassler 2021, [*Psilactis asteroides* A. Gray](https://www.catalogueoflife.org/data/taxon/4PGCF).

1. Hassler 2021, [*Psilactis brevilingulata* Sch. Bip. ex Hemsl.](https://www.catalogueoflife.org/data/taxon/4PGCG).

1. Hassler 2021, [*Psilactis gentryi* (Standl.) D. R. Morgan](https://www.catalogueoflife.org/data/taxon/4PGCK).

1. Hassler 2021, [*Psilactis tenuis* S. Watson](https://www.catalogueoflife.org/data/taxon/4PGCP).

## References

- Morgan, D.R. (2006). Vol. 20. Retrieved 22 September 2021.
- Hassler, M. (2021). ["*Psilactis* A. Gray"](https://www.catalogueoflife.org/data/taxon/746T). Catalogue of Life. [doi:10.48580/d4sd-3dd](https://doi.org/10.48580/d4sd-3dd). Retrieved 22 September 2021.
- POWO (2021). ["*Psilactis* A.Gray"](http://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:329886-2). *Plants of the World Online (powo.science.kew.org)*. [Royal Botanic Gardens, Kew](/source/Royal_Botanic_Gardens,_Kew). Retrieved 22 September 2021.
- 2014. PSILA2. Retrieved 22 September 2021.

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Adapted from the Wikipedia article [Psilactis](https://en.wikipedia.org/wiki/Psilactis) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Psilactis?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.