Two new species of Baccharis (Asteraceae, Astereae) from southern Brazil

Two new species of Baccharis L. assigned to subgenus Molina Heering and section Caulopterae DC. (Asteraceae, Astereae) are described and illustrated from southern Brazil. Baccharis jocheniona G. Heiden & Macias is distinguished by its erect-prostrate growth habit, broadly 3-winged stems, reduced scale leaves, panicles composed of spikes of solitary to 6-clustered capitula, female capitula with 50 to 60 florets with an irregularly denticulate corolla apex, and ca. 8-ribbed cypselae. Baccharis ramboi G. Heiden & Macias is distinguished by its glabrescent hispid indument, narrowly 3-winged stems, shortly petiolate leaves with oblong leaf blades, capitula clustered in a spike with a narrowly winged axis and conspicuous leafy bracts, female capitula with ca. 30 to 35 florets with a short ligulate apex, and cypselae with two ribs more conspicuous than the others. Baccharis jocheniana is compared with B. myriocephala DC. and B. cri spa Sprengel; B. ramboi is compared with B. pseudovillosa Malagarriga & J. E. Vidal.