''Perityle'' is a

genus Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...

flowering plant Flowering plants are plants that bear flowers and fruits, and form the clade Angiospermae (). The term angiosperm is derived from the Ancient Greek, Greek words (; 'container, vessel') and (; 'seed'), meaning that the seeds are enclosed with ...

s in the

daisy family Asteraceae () is a large family of flowering plants that consists of over 32,000 known species in over 1,900 genera within the order Asterales. The number of species in Asteraceae is rivaled only by the Orchidaceae, and which is the larger fam ...

. They are known generally as rock daisies. ''Perityle'' is a variable genus, with its members sharing few characteristics. They include small

herb Herbs are a widely distributed and widespread group of plants, excluding vegetables, with savory or aromatic properties that are used for flavoring and garnishing food, for medicinal purposes, or for fragrances. Culinary use typically distingu ...

s to spreading

shrub A shrub or bush is a small to medium-sized perennial woody plant. Unlike herbaceous plants, shrubs have persistent woody stems above the ground. Shrubs can be either deciduous or evergreen. They are distinguished from trees by their multiple ...

s and most bear yellow or white daisylike flower heads. The fruit is generally a flat seed with thickened margins which may or may not have a pappus or scales. Plants of this genus are native to

North North is one of the four compass points or cardinal directions. It is the opposite of south and is perpendicular to east and west. ''North'' is a noun, adjective, or adverb indicating Direction (geometry), direction or geography. Etymology T ...

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 ...

.Flora of North America Vol. 21 Page 317 ''Perityle'' Bentham
/ref> A study including morphological and cytological analyses and a phylogenomic analysis of chloroplast and nuclear genomes was published in 2022, and concluded that ''Perityle'' as previously circumscribed was

polyphyletic A polyphyletic group is an assemblage that includes organisms with mixed evolutionary origin but does not include their most recent common ancestor. The term is often applied to groups that share similar features known as Homoplasy, homoplasies ...

. The authors revived and/or expanded the genera ''

Galinsogeopsis ''Galinsogeopsis'' is a genus of flowering plants in the family Asteraceae. It includes 18 species native to Mexico and the southwestern United States, ranging from Arizona, New Mexico, and Texas to southern Mexico. Species 18 species are accept ...

'', ''

Laphamia ''Laphamia'' is a genus of flowering plants in the sunflower family, Asteraceae. It includes 43 species native to the southwestern and south-central United States and northern and western Mexico. Species 43 species are accepted. *''Laphamia aglo ...

'', and ''

Nesothamnus ''Nesothamnus incanus'' is a species of flowering plant in the family Asteraceae. It is endemic to Guadalupe Island, a Mexican Pacific island off the west coast of Baja California. The species was first named ''Perityle incana'' by Asa Gray in 1 ...

'' to establish monophyletic clades. The small genus ''Amauria'' and the Desventuradas Islands endemic species ''

Lycapsus tenuifolius ''Lycapsus'' is a genus of flowering plants in the tribe Perityleae within the family Asteraceae. ;Species There is only one known species, ''Lycapsus tenuifolius'', native to Chile in South America South America is a continent entirel ...

'' were merged into ''Perityle'', leaving it with 13 species.Isaac H. Lichter-Marck and Bruce G. Baldwin "A Phylogenetically Informed Reclassification of the Rock Daisies (Perityleae; Compositae)," ''Systematic Botany'' 47(3), 802-816, (16 September 2022). https://doi.org/10.1600/036364422X16573019348328

Species

13 species are currently accepted.Flann, C (ed) 2009+ Global Compositae Checklist

Formerly placed here

* ''

Laphamia fosteri ''Laphamia fosteri'' is an endangered species of flowering plant endemic to Culberson County, Texas. It is found along limestone canyons in the Apache Mountains, an offshoot of the Guadalupe Mountains The Guadalupe Mountains () are a mountai ...

'' (as ''Perityle fosteri'' A.M.Powell) * ''

Laphamia inyoensis ''Laphamia inyoensis'' (synonym (taxonomy), synonym ''Perityle inyoensis''), known by the common names Inyo rockdaisy and Inyo laphamia, is a rare species of flowering plant in the Asteraceae, aster family. It is endemism, endemic to Inyo County ...

'' (as ''Perityle inyoensis'' (Ferris) A.M.Powell) * ''

Laphamia lindheimeri ''Laphamia lindheimeri'', commonly called Lindheimer's rock daisy, is a species of flowering plant in the aster family (Asteraceae). It is native to the United States, where it is endemic to the Edwards Plateau of Texas. Its natural habitat is i ...

'' A.Gray (as ''Perityle lindheimeri'' (A.Gray) Shinners) * '' Laphamia saxicola'' Eastw. (as ''Perityle saxicola'' (Eastw.) Shinners) *''

Nesothamnus incanus ''Nesothamnus incanus'' is a species of flowering plant in the family Asteraceae. It is endemic to Guadalupe Island, a Mexican Pacific island off the west coast of Baja California. The species was first named ''Perityle incana'' by Asa Gray in 1 ...

'' (as ''Perityle incana'' A.Gray)

References

External links

*
Jepson Manual Treatment

USDA Plants Profile
{{Authority control Perityleae Asteraceae genera Flora of the Americas Taxa named by George Bentham