Psilactis
Introduction '''''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''.
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.
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