''Calyptocarpus'' 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 ...

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 ...

. The name is derived from the

Greek Greek may refer to: Anything of, from, or related to Greece, a country in Southern Europe: *Greeks, an ethnic group *Greek language, a branch of the Indo-European language family **Proto-Greek language, the assumed last common ancestor of all kno ...

''kalypto'' (covered or hidden) and ''karpos'' (fruit). Species are distributed in the

Southern United States The Southern United States (sometimes Dixie, also referred to as the Southern States, the American South, the Southland, Dixieland, or simply the South) is List of regions of the United States, census regions defined by the United States Cens ...

and

Latin America Latin America is the cultural region of the Americas where Romance languages are predominantly spoken, primarily Spanish language, Spanish and Portuguese language, Portuguese. Latin America is defined according to cultural identity, not geogr ...

. These are perennial herbs with decumbent to prostrate stems up to long. Their oppositely arranged leaves have blades of various shapes with toothed edges.

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 solitary in the leaf axils. Each has three to eight light-yellow ray florets and several yellow disc florets. The fruit is a flat cypsela with a pappus of two or more awns. TwoNesom, G. L. (2011)
Is ''Calyptocarpus vialis'' (Asteraceae) native or introduced in Texas?
''Phytoneuron'' 31, 1-7. to six species''Calyptocarpus''.
The Plant List. are accepted in the genus: * ''C. biaristatus'' - Brazil, Paraguay, Uruguay, Argentina * ''C. burchellii'' - southeastern Brazil * '' C. vialis'' – straggler daisy, horseherb, ''hierba del caballo'', lawnflower, creeping Cinderella-weed - Texas, Louisiana, Central America, Venezuela; naturalized in Taiwan, Australia, Hawaii, parts of United States * ''C. wendlandii'' - Central America, southern Mexico

References

Asteraceae genera Heliantheae Taxa named by Christian Friedrich Lessing {{Heliantheae-stub