Chaenostoma Benth.
(Sutera Roth s.l.)
Chaenostoma is an African (predominantly South African) genus with 46 species (Kornhall & Bremer 2004). It is a segregate of the genus Sutera. Molecular phylogenetic studies have demonstrated that Sutera was paraphyletic in its traditional circumscription, while its two sections (section Sutera and section Chaenostoma) are monophyletic. To accommodate these findings the genus Chaenostoma was re-established (Kornhall & Bremer 2004, 2005). Sutera in a strict sense only counts three species. From the genus Chaenostoma, one species (C. cordatum) is commonly grown in Europe in gardens, pots and baskets (Gardner 2000, Jäger & al. 2008). It increasingly occurs as an escape.
Literature:
Gardner M.F. (2000) Sutera. In: Cullen J. & al. (eds.), The European Garden Flora, vol. 6. Cambridge University Press, Cambridge: 301.
Hilliard O.M. (1991) Further new names and combinations in Scrophulariaceae : Manuleae. Edinburgh J. Bot. 48(3): 341-346.
Hilliard O.M. (1994) The Manuleae. A Tribe of Scrophulariaceae. Edinburgh University Press, Edinburgh.
Jäger E.J., Ebel F., Hanelt P. & Müller G. (eds.) (2008) Rothmaler Band 5. Exkursionsflora von Deutschland. Krautige Zier- und Nutzpflanzen. Springer Verlag, Berlin: 880 p.
Kornhall P. & Bremer B. (2004) New circumscription of the tribe Limoselleae (Scrophulariaceae) that includes the taxa of the tribe Manuleeae. Bot. J. Linn. Soc. 146: 453-467. [available online at: http://info.bergianska.se/pub/publikationer/Bremer/Kornhall_Bremer_2004_1.pdf]
Kornhall P. & Bremer B. (2005) Corrigendum. New circumscription of the tribe Limoselleae (Scrophulariaceae) that includes the taxa of the tribe Manuleeae. Bot. J. Linn. Soc. 147: 385-386. [available online at: http://onlinelibrary.wiley.com/doi/10.1111/j.1095-8339.2005.00424.x/pdf]
Mabberley D.J. (2008) Mabberley’s plant-book (3th ed.). Cambridge University Press, Cambridge: XVIII + 1021 p.