Ageratum

• Authority

  Acevedo-Rodríguez, Pedro & collaborators. 1996. Flora of St. John, U.S. Virgin Islands. Mem. New York Bot. Gard. 78: 1-581.

• Family

  Asteraceae

• Scientific Name

  Ageratum

• Description

  Genus Description - Annual or perennial herbs (in ours) to shrubs; stems glabrous to pilose. Leaves simple, generally opposite, petiolate; blades commonly 3-nerved from base. Inflorescence generally terminal, in compact or open cymose or corymbiform clusters. Heads discoid, many-flowered, pedunculate; involucre bell-shaped, 2-3-seriate; involucral bracts weakly overlapping, subequal; receptacle conical, generally naked. Flowers bisexual; corollas actinomorphic, tubular, shortly 5-lobed, the triangular lobes papillose within; anthers in eluded; style branches long, greatly exserted from corollas, the upper half of style branches with a large sterile appendage. Achenes angled, glabrous or with bristles on the angles; pappus of 5(-6) apically tapering scales, crown-shaped, or absent.

• Distribution

  Genus of about 40 species native to the neotropics, but introduced into the N e w World subtropics and the Paleotropics.