Baccharis erigeroides de Candolle (1836: 418)

Heiden, Gustavo & Pirani, José Rubens, 2012, A synopsis and notes for Baccharis subgen. Tarchonanthoides (Asteraceae: Astereae), Phytotaxa 60 (1), pp. 41-49 : 46

14. Baccharis erigeroides de Candolle (1836: 418) . —Type: “in campis editis prov. Sancti-Pauli”. BRAZIL. São Paulo: Mogi das Cruzes, November 1833, ♀, P. W. Lund 845 (holotype G-DC (00136722) 2 sheets photo!).

Baccharis puberula de Candolle (1836: 401) . — Type: “in Brasiliae prov. Sancti-Pauli ... (v.s. ♀ in h. Mus. reg. Par. à Mus. imp. Bras. sub n. 515 miss.) ”. BRAZIL. São Paulo: s.d., ♀, F. Sellow s.n. = M. I. B. 515 (holotype P (00755577) photo!; isotype G-DC microfiche!).

Baccharis erigeroides var. dusenii Heering ex Dusén (1910: 23) . — Type: "Gesammelt auf den Campos bei Capão grande am 18. Dez. 1903 (Nr. 2766), und bei Capivari am 21. Okt. 1908 ". BRAZIL. Paraná: Ponta Grossa, Capão Grande, 18 December 1903, ♂, P. K. H. Dusén 2766 (lectotype R!, first-step lectotype designated by Barroso 1976: 55, second-step lectotype designated here; isolectotype R!, S) . — Syntypes: BRAZIL. Paraná: Jaguariaíva, Capivari , 21 October 1908, ♂, P. K. H . Dusén s.n. (syntypes A (00003941) photo!, E! (00346655), M (0031202) photo!, NY! (00162243)) .

De Candolle (1836) described B. erigeroides based on Lund s.n. The specimen Lund 845, the only collection of this species at G-DC herbarium, agrees with the original data and description in the protologue and is composed of two sheets labelled as part 1 and 2 of the same specimen. These are stored under the same barcoding number (G00136722). So a lectotypification is not required in this situation. Concerning Baccharis erigeroides var. dusenii, Barroso (1976) cited the specimen Dusén 2766 as a type with duplicates housed in R and S, without specifying which one is the lectotype. There are two duplicates of Dusén 2766 stored in the same folder in R, but not labelled as the same specimen. Barroso’s (1976) indication of Dusén 2766 is a firststep lectotypification. The designation here, of the preparation consisting of a branch with a fertile and a vegetative shoot along with another detached fertile shoot and the original label with Dusén’s handwriting, is the second-step lectotypification. The remaining duplicate at R, composed of three detached fertile branches, is considered an isolectotype; the duplicate in S could not be located. Baccharis erigeroides var. dusenii Heering ex Dusén is commonly cited as originally described by Heering, however, this taxon was recognized by Heering in schedula and was later validated by Dusén (1910).