Calea angusta S.F.Blake (1930: 258) ≡ Galinsoga angustifolia Sprengel (1821: 138)

Protologue:—“E Brasilia. Otto ”.

Neotype (designated here):— BRAZIL. Bahia: Nazaré, 1818, F. Sellow s.n. (K [K000323196]!; isoneotype P [P00117059]!).

= Ageratum angustifolium Sprengel (1826: 446) ≡ Trichophyllum angustifolium (Sprengel) Lessing (1831: 519) ≡ Bahia angustifolia (Sprengel) Candolle (1836: 656) . ≡ Calea angustifolia (Sprengel) Schultz-Bipontinus ex Baker (1884: 256), non Calea angustifolia Gardner (1848: 417) .

Protologue:—”Monte Video. Sello”.

Lectotype (designated here):— BRAZIL. Bahia: Nazaré, 1818, F. Sellow s.n. (P [P00117060]!).

Note:—The names Galinsoga angustifolia Sprengel and Calea angustifolia Gardner (a synonym currently accepted as C. multiplinervia Lessing (1830: 159) were published earlier than C. angusta . As the specific epithet “ angustifolia ” was already occupied by Gardner (1848), Blake (1930) proposed the new name C. angusta for G. angustifolia . The protologue of G. angustifolia indicated one collection of C.F. Otto; however, Otto only worked in Germany and this specimen was actually collected in Brazil by F. Sellow (Moraes 2020).

Roque & Carvalho (2011) indicated that the type specimen of G. angustifolia is Sellow 1001 and for Ageratum angustifolium is Sellow 590. The protologue of A. angustifolium indicates that the collector was “Sello” and indicates that the specimen would have been collected in Uruguay. However, this species is endemic to Northeastern Brazil, suggesting that the locality information provided in the label is erroneous or misleading.

There is no indication of a collection number associated with the Sellow specimens associated with the names C. angusta, G. angustifolia, A. angustifolium, Bahia angustifolia, and Trichophyllum angustifolium, at either Kew (K) or the Paris (P) herbaria. According to Herter (1955), these specimens were collected in 1818, probably in the first half of the year, when Sellow was in the Nazaré region, Bahia state. Galinsoga angustifolia was described on the material different from the type of Ageratum angustifolium, despite having been collected by Sellow in the same region.

Calea angusta occurs in Alagoas, Bahia and Sergipe states in Brazil (Fig. 2). The occurrence in Alagoas [MAC7171] is highlighted here as the first occurrence of the genus for the state.