''Psilactis'' is a genus of

North America North America is a continent in the Northern Hemisphere, Northern and Western Hemisphere, Western hemispheres. North America is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South Ameri ...

n and

South America South America is a continent entirely in the Western Hemisphere and mostly in the Southern Hemisphere, with a considerably smaller portion in the Northern Hemisphere. It can also be described as the southern Subregion#Americas, subregion o ...

n plants in the tribe

Astereae Astereae is a tribe of plants in the family Asteraceae that includes annuals, biennials, perennials, subshrubs, shrubs, and trees. They are found primarily in temperate regions of the world. Plants within the tribe are present nearly worldwide di ...

within the family

Asteraceae Asteraceae () is a large family (biology), family of flowering plants that consists of over 32,000 known species in over 1,900 genera within the Order (biology), order Asterales. The number of species in Asteraceae is rivaled only by the Orchi ...

which are known by the common name tansyaster. There are six species within the genus.

Taxonomy

The genus contains six species: ''

Psilactis asteroides ''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 spec ...

'', '' 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''.

Distribution

Five species within the genus have

native Native may refer to: People * '' Jus sanguinis'', nationality by blood * '' Jus soli'', nationality by location of birth * Indigenous peoples, peoples with a set of specific rights based on their historical ties to a particular territory ** Nat ...

distribution in

Mexico Mexico, officially the United Mexican States, is a country in North America. It is the northernmost country in Latin America, and borders the United States to the north, and Guatemala and Belize to the southeast; while having maritime boundar ...

. ''Psilactis heterocarpa'' is restricted to

Texas Texas ( , ; or ) is the most populous U.S. state, state in the South Central United States, South Central region of the United States. It borders Louisiana to the east, Arkansas to the northeast, Oklahoma to the north, New Mexico to the we ...

in the

United States The United States of America (USA), also known as the United States (U.S.) or America, is a country primarily located in North America. It is a federal republic of 50 U.S. state, states and a federal capital district, Washington, D.C. The 48 ...

with no Mexican distribution. ''P. odysseus'' is restricted to the Mexican states

Nuevo León Nuevo León, officially the Free and Sovereign State of Nuevo León, is a Administrative divisions of Mexico, state in northeastern Mexico. The state borders the Mexican states of Tamaulipas, Coahuila, Zacatecas, and San Luis Potosí, San Luis ...

and

Tamaulipas Tamaulipas, officially the Free and Sovereign State of Tamaulipas, is a state in Mexico; one of the 31 states which, along with Mexico City, comprise the 32 federal entities of Mexico. It is divided into 43 municipalities. It is located in nor ...

, 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 Colombia, officially the Republic of Colombia, is a country primarily located in South America with Insular region of Colombia, insular regions in North America. The Colombian mainland is bordered by the Caribbean Sea to the north, Venezuel ...

and

Peru Peru, officially the Republic of Peru, is a country in western South America. It is bordered in the north by Ecuador and Colombia, in the east by Brazil, in the southeast by Bolivia, in the south by Chile, and in the south and west by the Pac ...

Citations

References

* * * * {{Taxonbar, from=Q7255799 Astereae Asteraceae genera Taxa named by Asa Gray