5.29. Begonia unilateralis Rusby, Descr. S. Amer. Pl. 68 (1920). – Type: Bolivia, [La Paz

Department], Nequejahuira [16°20′S, 67°50′W], 8000 ft, 15–24 v 1926, G. H. H. Tate 657 (lectotype NY [NY00118710] designated in: Revista Univ. (Cuzco) 33(87): 81 (1944) by Smith, L. B. & Schubert, B. G.) .

L.B. Smith & B.G. Schubert, Revista Univ. (Cuzco) 33(87): 81 (1944); R.C. Foster, Contr. Gray Herb. 184: 138 (1958); D.C. Wasshausen et al. in P.M. JØrgensen et al. (eds), Cat. Bolivia, Monogr. Syst. Bot. Missouri Bot. Gard. 129: 386 (2013).

Distribution. Endemic to Bolivia.

Nomenclatural notes. The protologue of Begonia unilateralis Rusby cited the collection G.H.H. Tate 657 but no herbarium (Rusby, 1934). Smith & Schubert (1944a) cited a sheet of this collection in the New York Botanical Garden herbarium as the type. Only one sheet in New York matches this description, so this is an effective lectotypification.

Identification notes. This is the only species of Begonia in Bolivia with an indumentum of peltate scales.