Begonia sect. Ruizopavonia, A. DC.

Moonlight, P. W. & Pérez, Á. J., 2022, Begonia (sect. Ruizopavonia) De Candolle 1859, Edinburgh Journal of Botany 79 (401), pp. 1-9 : 2-3

Key to the Colombian and Ecuadorian species of Begonia sect. Ruizopavonia

1a. Stipules persistent, remaining on the stem long after the leaves Begonia tonduzii C.DC.

1b. Stipules early deciduous, lost before the leaves are fully grown _____________________ 2

2a. Inflorescence internodes elongated,> 5 mm long; pistillate flowers with 3 of 5 tepals see key in Tebbitt et al. (2017)

2b. Inflorescence internodes short, <2 mm long; pistillate flowers with 2 or 3 tepals ____ 3

3a. Staminate flowers with 2 tepals ______________________________ Begonia alnifolia A.DC.

3b. Staminate flowers with 4 tepals ___________________________________________________ 4

4a. Tepals on the staminate and pistillate flowers> 10 mm long, orange, apices long-acuminate ______________________ Begonia cuatrecasasiana L.B.Sm. & B.G.Schub.

4b. Tepals on the staminate and pistillate flowers <10 mm long, white to pink, apices rounded, glabrous on both surfaces ________________________________________________ 5

5a. Terrestrial herb to> 5 m tall; bracteoles lacking; 2 tepals on the pistillate flowers Begonia pseudodendron

5b. Terrestrial herb to <2 m tall; 2 or 3 bracteoles present directly beneath the ovary, persistent; 3 tepals on the pistillate flower (unknown in Begonia dugandiana ) ________ 6

6a. Stamens c.20; leaf laminae with 6–8 secondary veins on the broadest side; styles unknown but presumed bifid _______________ Begonia dugandiana L.B.Sm. & B.G.Schub.

6b. Stamens> 25; leaf laminae with 8–12 secondary veins on the broadest side; styles multifid ___________________________________________________________________________ 7

7a. Leaf laminae straight, ovate; inner tepals on the staminate flower c.5 × 2 mm Begonia cymbalifera L.B.Sm. & B.G.Schub.

7b. Leaf laminae transversely ovate; inner tepals on the staminate flower c.3 × 1 mm Begonia consobrina Irmsch.