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Psilactis
Psilactis asteroides, Otero County, New Mexico
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Asterids
Order:	Asterales
Family:	Asteraceae
Subfamily:	Asteroideae
Tribe:	Astereae
Subtribe:	Symphyotrichinae
Genus:	Psilactis A.Gray
Type species
Psilactis asteroides A.Gray
Species
P. asteroides A.Gray P. brevilingulata Sch.Bip. ex Hemsl. P. gentryi (Standl.) D.R.Morgan P. heterocarpa (R.L.Hartm. & M.A.Lane) D.R.Morgan P. odysseus (G.L.Nesom) D.R.Morgan P. tenuis S.Watson
Synonyms
Machaeranthera Nees sect. Psilactis (A.Gray) B.L.Turner & D.B.Horne

Psilactis is a genus of North American and South American plants in the tribe Astereae within the family Asteraceae which are known by the common name tansyaster. There are six species within the genus.

Taxonomy

The genus contains six species: Psilactis asteroides, Psilactis brevilingulata, Psilactis gentryi, Psilactis heterocarpa, Psilactis odysseus, and Psilactis tenuis. Formerly included in the genus were Psilactis coulteri and Psilactis crispa which are now placed in genus Leucosyris as L. coulteri and L. crispa, respectively. Additionally, Psilactis lepta has been determined to be a taxonymic synonym of Psilactis asteroides.

• P. asteroides
• P. brevilingulata
• P. gentryi
• P. heterocarpa

Distribution

Five species within the genus have native distribution in Mexico. Psilactis heterocarpa is restricted to Texas in the United States with no Mexican distribution. P. odysseus is restricted to the Mexican states Nuevo León and Tamaulipas, and the other four species, P. asteroides, P. brevilingulata, P. gentryi, and P. tenuis have distributions in both Mexico and the United States. P. brevilingulata has an additional presence in Colombia and Peru.

Citations

1. ^ POWO 2021.
2. Lectotype designated by Pfeiffer, L.K.G. 1874. Nomenclator Botanicus 2(2): 857.
3. Tropicos, Psilactis A. Gray
4. Morgan 2006.
5. USDA 2014.
6. POWO 2021, Psilactis coulteri A.Gray.
7. POWO 2021, Psilactis crispa Brandegee.
8. POWO 2021, Psilactis lepta Shinners.
9. Hassler 2021, Psilactis heterocarpa (R. L. Hartm. & M. A. Lane) D. R. Morgan.
10. Hassler 2021, Psilactis odysseus (G. L. Nesom) D. R. Morgan.
11. Hassler 2021, Psilactis asteroides A. Gray.
12. ^ Hassler 2021, Psilactis brevilingulata Sch. Bip. ex Hemsl..
13. Hassler 2021, Psilactis gentryi (Standl.) D. R. Morgan.
14. Hassler 2021, Psilactis tenuis S. Watson.

References

• Morgan, D.R. (2006). "Psilactis". In Flora of North America Editorial Committee (ed.). Flora of North America North of Mexico (FNA). Vol. 20. New York and Oxford: Oxford University Press. Retrieved 22 September 2021 – via eFloras.org, Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
• Hassler, M. (2021). "Psilactis A. Gray". Synonymic Checklists of the Vascular Plants of the World. In O. Bánki, Y. Roskov, L. Vandepitte, R. E. DeWalt, D. Remsen, P. Schalk, T. Orrell, M. Keping, J. Miller, R. Aalbu, R. Adlard, E. Adriaenssens, C. Aedo, E. Aescht, N. Akkari, M. A. Alonso-Zarazaga, B. Alvarez, F. Alvarez, G. Anderson, et al., Catalogue of Life Checklist (Version 2021-08-06). Catalogue of Life. doi:10.48580/d4sd-3dd. Retrieved 22 September 2021.
• POWO (2021). "Psilactis A.Gray". Plants of the World Online (powo.science.kew.org). Royal Botanic Gardens, Kew. Retrieved 22 September 2021.
• NRCS (2014). "Psilactis". PLANTS Database. United States Department of Agriculture (USDA). Retrieved 22 September 2021.

• Astereae
• Asteraceae genera
• Taxa named by Asa Gray