8.37. Begonia leptostyla Irmsch., Bot. Jahrb. Syst. 74: 609 (1949).

– Type: Bolivia, [La Paz Department, Prov. Abel Iturralde], Tumupasa, [14°9′S, 67°54′W], 1800 ft, 11 xii 1901, R.S. Williams 455 (holotype US [US00115362]; isotypes BM [BM001191455], K [K000544024], NY [NY03091191]) .

D.C. Wasshausen et al. in P.M. JØrgensen et al. (eds), Cat. Bolivia, Monogr. Syst. Bot. Missouri Bot. Gard. 129: 385 (2013).

Distribution. Endemic to Bolivia.

Identification notes. The only Bolivian Begonia with pinnate venation; stems with a tomentose indumentum; deciduous, triangular stipules; and a rounded leaf base.

Begonia leptostyla is distinguished from B. buchtienii and B. varistyla by its rounded leaf bases (but see Notes for B. buchtienii) and from B. bangii in its symmetrical oblong-ovate stipules (vs symmetrical and ovate to reniform).