Lindernia rotundifolia (Linnaeus 1771: 174) Alston (1931: 214) (Fig. 10)

Gratiola rotundifolia Linnaeus

Type:— INDIA. Habitat in Malabariae arenosis”, LINN-HL30-4 (LINN, Lectotype designated by Cramer in Dassanayake & Fosberg (1981: 417)

Ilysanthes hypericifolia Bonati (1926: 10)

Type:— MADAGASCAR. Ouest: Marécages du Haut Bemarivo, Boïna, April 1907, H.Perrier de la Bâthie 8476 (Holotype P!) .

Ilysanthes madagascariensis Bonati (1926: 12) .

Type:— MADAGASCAR. Centre: Bords du Maningory, lac Alaotra, December 1912, H.Perrier de la Bâthie 8468 (Holotype P!) .

Additional specimens examined: — MADAGASCAR. Ambanizana, 6 October 2015, E.Fischer s.n. (TAN, KOBL);.Tsimbazaza, 5 April 2007, E.Fischer s.n. (TAN, KOBL);.Lac Mantasoa, 9 April 2007, E.Fischer s.n. (TAN, KOBL).