Salvinia (Salviniaceae) in southern and southeastern Brazil—including new taxa, new distribution records, and new morphological characters

In this work, the taxonomic study of Salvinia from the southern and southeastern regions of Brazil is presented. We analyzed materials from herbaria BHCB, BHZB, CAY, CESJ, CVRD, DIAM, ESAL, FLOR, FUEL, FURB, HAS, HB, HBR, HUFU, HURG, ICN, MBM, MBML, OUPR, PACA, R, RB, SJRP, SP, SPF, SPFR, UEC, UPCB, VIC, VIES, plus online images of types, and field studies. In southern and southeastern Brazil, nine taxa of Salvinia occur, of which two are new to science: S. auriculata var. major C.V. Miranda & Schwartsb., var. nov., S. biloba Raddi , S. cucullata Roxb. , S. × delasotae C.V. Miranda & Schwartsb. , hybr. nov., S. herzogii de la Sota , S. oblongifolia Mart. , S. minima Baker , S. molesta D.S. Mitch., and S. radula Baker . Salvinia cucullata and S. × delasotae are cultivated taxa, not occurring naturally. Based on studies of plants from French Guiana, we concluded that S. auriculata s. str. (= S. auriculata var. auriculata ) does not occur in southern and southeastern Brazil. Updated nomenclatural headings, descriptions, illustrations, key, and maps of distribution of all taxa are also presented.