Louteridium section Louteridium

Daniel, Thomas F. & Tripp, Erin A., 2018, Louteridium (Acanthaceae: Acanthoideae: Ruellieae: Trichantherinae): Taxonomy, Phylogeny, Reproductive Biology, and Conservation, Proceedings of the California Academy of Sciences 65 (2), pp. 41-106 : 68

1. Louteridium section Louteridium . TYPE.— Louteridium mexicanum (Baill.) Standl.

Evergreen shrubs or trees (to 12 m tall); herbaceous stems glabrous or puberulent to pubescent with eglandular (and rarely also glandular) trichomes; leaves not seasonally/simultaneously deciduous, membranaceous, ± evenly distributed along stems; calyx 17–40 mm long (during anthesis); stamens 2.

The three species of this section ( L. donnell-smithii , L. mexicanum , and L. purpusii ) occur from southern Mexico (central Veracruz) into western Honduras (west-central Comayagua).