Baccharis sect. Andina G. Heiden, 2016

Heiden, Gustavo & Pirani, José Rubens, 2016, Novelties towards a phylogenetic infrageneric classification of Baccharis (Asteraceae, Astereae), Phytotaxa 289 (3), pp. 285-290 : 286

1.1. Baccharis sect. Andina G. Heiden , sect. nov. Type: — Baccharis lehmannii Klatt

Baccharis sect. Andina embraces shrubs or treelets with capitula in terminal glomerules or secondary capitula, and differs from B. sect. Agglomeratae Giuliano (2001: 535) by capitula with 20–115 (vs. 3–15) florets.

Some of the species assigned to B. sect. Andina were included by Cuatrecasas (1967) in B. sect. Involucratae Heering (1905: 17), whose type is B. conferta Kunth (1818: 55) , a species belonging to B. sect. Baccharis , while B. tricuneata ( Linnaeus 1782: 368) Persoon (1807: 424) was considered in B. sect. Cuneifoliae Candolle (1836: 405), which is not closely related and comprises species with solitary capitula occurring in Patagonia. Baccharis sect. Andina is a group of 13 species of shrubs and treelets from the Northern Andes occurring mostly in subpáramos and páramos from Venezuela to Ecuador.

Species assigned (13):— B. angelica Benoist , B. balnearia Benoist , B. boyacensis Cuatrec. , B. cochensis Hieron. , B. emarginata (Ruiz & Pav.) Pers. , B. grandicapitulata Hieron. , B. lehmannii Klatt , B. lloensis Hieron. , B. pachycephala Hieron. , B. paramicola Cuatrec. , B. sinuata Kunth , B. teindalensis Kunth , and B. tricuneata (L.f.) Pers.

1.2. Baccharis sect. Axillares ( Giuliano 2005: 539) G. Heiden , stat. nov. Baccharis ser. Axillares Giuliano (2005: 539) . Type: — Baccharis axillaris DC

Baccharis sect. Axillares comprises shrubs and subshrubs with solitary pauciflorus capitula in leaf axils, generally disposed in leafy racemes or panicles of leafy racemes, except for B. umbellata Heiden & Ribas (2012: 24) which have an umbelliform capitulescence.

The section was originally described as a series subordinated to B. sect. Cylindricae Heering (1905: 16) by Giuliano (2005), but the type of the section belongs to a lineage not related to the species of B. ser. Cylindricae (Heiden 2014). Hence the new status is here proposed. Baccharis sect. Axillares as defined here is a lineage comprising 13 species that diversified on the high altitude tropical and subtropical grasslands from Southeastern Brazil and on the low altitude temperate grasslands from Southern Brazil and Uruguay.

Species assigned (13):— B. aracatubaensis Malag. , B. axillaris DC. , B. cultrata Baker , B. floccosa Deble & A.S.Oliveira , B. hypericifolia Baker , B. incisa Hook. & Arn. , B. leptospermoides DC. , B. lymanii G. M. Barroso ex G. Heiden , B. minutiflora Mart. ex Baker , B. sphenophylla Dusén ex Malme , B. trilobata A. S. Oliveira & Marchiori , B. trineura Soria & Zardini , and B. umbellata G. Heiden & Ribas.