''Clappia suaedifolia'' is the sole species in the

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 ...

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 ...

of flowering plants in 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 ...

, ''Clappia''.Gray, Asa. 1859. Report on the United States and Mexican boundary survey :made under the direction of the secretary of the Interior, Botany 2(1): 93-94
/ref> ''Clappia suaedifolia'' is native 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 ...

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 ...

. It is a succulent, branching shrub or subshrub up to 30 cm (12 inches) tall.

Flower heads A pseudanthium (; : pseudanthia) is an inflorescence that resembles a flower. The word is sometimes used for other structures that are neither a true flower nor a true inflorescence. Examples of pseudanthia include flower heads, composite flowers ...

are yellow, appearing one at a time, with both

ray florets 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 fa ...

and

disc floret 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 fa ...

s.Biota of North America Program 2013 county distribution map
/ref> The genus is named for Dr. Asahel Clapp, of

New Albany, Indiana New Albany is a city in New Albany Township, Floyd County, Indiana, United States, situated along the Ohio River, opposite Louisville, Kentucky. The population was 37,841 as of the 2020 census. The city is the county seat of Floyd County. It ...

. Annotations on the type specimen of ''Haplopappus nealleyi'' in the US National Herbarium, on which the genus '' Stanfieldia'' and sole species '' Stanfieldia nealleyi'' were also based, suggest that these later names may be synonyms of ''Clappia suaedifolia''.

References

Tageteae Flora of Texas Flora of Tamaulipas Plants described in 1859 {{Asteroideae-stub