Nasa rudis (Benth.) R.H.Acuña & Weigend 2023

Acuña-Castillo, Rafael & Weigend, Maximilian, 2023, A new combination in Nasa (Loasaceae) from Mesoamerica, Phytotaxa 598 (2), pp. 182-184 : 182-183

Nasa rudis (Benth.) R.H.Acuña & Weigend , comb. nov.

Basionym:— Loasa rudis Benth., Pl. Hartw. [Bentham]: 75. 1841.

Homotypic synomyms:— Loasa triphylla Juss. var. rudis (Benth.) Urban & Gilg (1900: 239) ; Loasa triphylla Juss. subsp. rudis (Benth.) Weigend (1996: 227) . Nasa triphylla (Juss.) Weigend subsp. rudis (Benth.) Weigend in Weigend et al. (2006:82).

Type:— GUATEMALA. [Dpto. Unspecified:] Santa María, Nov. 1840, C.T. Hartweg s.n. (Holotype: K barcode K000372760 !)

= Loasa rhoeadifolia Schlechtendal (1840: 382) . Type:— MEXICO. [Veracruz:] Cuesta Grande de Chiconquiaco , Sep. 18[29?], C. Schiede s.n. (Not located)

= Loasa bicolor Klotzsch (1851: 361) . Type:—[Probably plants cultivated in] GERMANY. Thuringia: Erfurt, by Moschkowitz & Siegling, from seed material provided by J. Warszewicz from Panama. Chiriquí: Chiriquí Mountains (Not located, probably in B and lost during World War II).

= Loasa bipinnata Donnell-Smith (1897: 7) . Lectotype (designated by Weigend, 1996: 227):— COSTA RICA. [San José:] Entre San José et Desamparados , au bord du chemin, 14 Sep. 1889, H. Pittier [s.n. (Herb. Instit. physico-geogr. nat. costaricensis)] 1314: BM barcode BM000021435!; Isolectotypes: US barcode US 00115206!, BR barcode BR0000013347239! [Legit. A. Tonduz], BR barcode BR0000013347246! [Legit. A. Tonduz]).

Notes. The proposal to conserve Loasa rudis against the older L. rhoeadifolia was just recently published by us and awaits formal acceptance ( Acuña-Castillo & Weigend, 2022). Hartweg visited at least two localities with the name of “Santa María” while he was in Guatemala. The first near the volcano of the same name, in what nowadays is Departamento Quetzaltenango, and the second in Departamento Sacatepéquez near the Agua Volcano ( Hartweg, 1848). We are unsure where he collected the Loasa rudis type collection. The type material associated with L. rhoeadifolia seems to be lost as mentioned by Acuña-Castillo and Weigend (2022). We have been unable to locate any extant material that could be considered a type associated with the name L. bicolor , however, the description and origin of the plants (Prov. Chiriquí, Panamá) indicate that it most likely represents a heterotypic synonym of Nasa rudis .