Monteiroa triangularifolia Krapovickas 1951

11. Monteiroa triangularifolia Krapovickas in Bol. Soc. Argent. Bot. 3(4): 240-241, fig. 3, 1951. Holotype: BRAZIL. Rio Grande do Sul: São Leopoldo, Dois Irmãos, in silva, 20 November 1935, B. Rambo 2154 (LIL 176233!; isotypes LIL!, PACA!). Figure 11 A-H. Taxonomic notes:—The habit still unknown, but probably a shrub, M. triangularifolia is characterized by: leaves 2–5 times larger than wider, basally truncate or subcordate, slightly 3–5-lobed, adaxial surface with sparse simple trichomes, rarely bifid or stellate, abaxial surface with sparse stellate trichomes, denser in young leaves; epicalyx bracts lanceolate-ovate, ca. 1 × 0.7 cm. Distribution, habitat and conservation status:—So far, the species is known only from the type collection, from the municipality of Dois Irmãos, at the time of collection, belonging to the municipality of São Leopoldo, State of Rio Grande do Sul, Brazil (Figure 12). In the present study, in a field trip to the region, the species was not found again. In the collection label is registered that it was collected in the forest (“in silva”). The region is included in Provincia Paranense (Cabrera & Willink 1973) at elevations of 100 to 440 m, in the Brazilian Atlantic rainforest. Monteiroa triangularifolia is here considered Critically Endangered (CR) because it is known from only one location, presenting an AOO <10 km ² and a continuing decline is estimated in its AOO, due to the increasing conversion of natural areas to crops and urbanization in their habitat, criteria B2ab (ii).