3. Tanaecium bilabiatum (Sprague) L.G.Lohmann, Nuevo Cat. Fl. Vasc.Venezuela 274. 2008. Fig. 1A, L

Memora bilabiata Sprague, Bull. Herb. Boissier (ser. 2) 6: 375. 1906.

Adenocalymma bilabiatum (Sprague) Sandwith, Recueil Trav. Bot. Néerl . 34: 213. 1937. Type: Brazil. Amazonas: Manaus, s.d., R. Spruce 1783 (holotype, K [K000492969] image!).

Habitat and distribution.

Tanaecium bilabiatum grows in wet, flooded, riparian vegetation, or Amazonian lowlands. It occurs in Bolivia (Beni, Pando), Brazil (Acre, Amapá, Amazonas, Pará, Roraima), Colombia (Amazonas, Arauca, Guainía), French Guyana, Guyana, Peru (Madre de Dios, Loreto), Suriname (Sipaliwini, Nickerie), and Venezuela (Amazonas, Apure, Bolívar, Delta Amacuro, Guárico, Monagas, Sucre).

Phenology.

Flowering: February to November; fruiting: December to October.

Notes.

Tanaecium bilabiatum is easily differentiated from other Tanaecium species by the pulvinated petioles (typical of Adenocalymma but usually lacking in Tanaecium and other Bignonieae; Lohmann and Taylor 2014), large bilabiate calyces, covering 1:3 to 2:3 of the corolla tube, white corollas with yellow mouths, oblong and flattened fruits, and seeds with vestigial wings (rarely well-developed) (Tab. 1).