Stenandrium sect. Stenandrium

Franck, Alan R. & Daniel, Thomas F., 2015, Taxonomic and Nomenclatural Notes on Six Genera of Acanthaceae in the West Indies, Proceedings of the California Academy of Sciences 62 (10), pp. 309-329 : 318

Stenandrium sect. Stenandrium . Stenandrium Nees sect. Schizostenandrium Lindau, Nat.

Pflanzenfam. 4(3b):321. 1895, nom. illeg. TYPE.— Stenandrium mandioccanum Nees.

DISCUSSION.— Two remarkably different pollen morphologies have been observed in Stenandrium : a prolate, tricolpate, aperturate type and a spherical, gemmate, inaperturate type. Lindau (1895) described two sections based on these two pollen types.

Stenandrium sect. Stenandrium is characterized by tricolpate pollen. Because Lindau included the type of Stenandrium ( S. mandioccanum ) in his sect. Schizostenandrium, his name for the section is superfluous for the autonym. Lindau (1893) provided an illustration of tricolpate pollen from S. humboldtianum Nees , which he included in this section. Lindau (1895) also included S. rupestre (Sw.) Nees (= S. tuberosum (L.) Urb.) from Hispaniola within this section.

Stenandrium sect. Sphaerostenandrium Lindau, Nat. Pflanzenfam. 4(3b):321. 1895. TYPE.—

Stenandrium trinerve Nees (designated here).

DISCUSSION.— Stenandrium sect. Sphaerostenandrium is characterized by gemmate pollen.

Lindau (1895) included S. dulce (Cav.) Nees and S. trinerve in this section. Though S. dulce has been reported to have the two different pollen types noted above, it is unclear which type of pollen the type material of S. dulce residing at MA possesses. This widespread species appears to have gemmate pollen in Argentina, Bolivia, Chile, Mexico, Paraguay, and Florida, U.S.A. ( Lindau 1895; Ariza Espinar and Ferrucci 1982; Daniel 1998; Pire et al. 2003). However, some specimens from Brazil and Mexico assigned to this species have only tricolpate pollen ( Lindau 1895; Daniel 1998). Because Ariza Espinar and Ferrucci (1982) reported that the original material of S. trinerve studied by Nees and residing at K has gemmate pollen, S. trinerve is here designated as the type of S. sect. Sphaerostenandrium. Stenandrium trinerve is now commonly treated as a synonym of S. dulce (Ariza Espinar and Ferrucci 1982; Ezcurra and Kameyama 2008). Lindau (1893) provid- ed an illustration of gemmate pollen from S. trinerve . This section is not known from the West Indies.