1. Abaxial leaf surface initially sericeous, the trichomes straight and appressed with stalks 0—0.05 mm, sometimes rapidly glabrescent.
2. Leaves irregular in shape, repand and undulate; bracts frequently subtending the peduncles of two flowers; plants cultivated in Nicaragua … B. glandulifera
2. Leaves regular in shape, not repand or undulate; each bract subtending the peduncle of only one flower; plants native to Nicaragua.
3. Larger leaves (14.5--) 18.5--38 cm de largo y (6.6) 8—16.5 cm de ancho, longest trabeculae on abaxial surface (0.8) 1—1.5 (1.75) mm; stipules (1.5--) 2.5—6.6 (--11) mm; stigma lobes 3, ovary and fruit with 3 locules … B. dwyeri
3. Larger leaves (6--) 8—16.5 cm de largo y 2.9—8.2 cm de ancho, longest trabeculae on abaxial surface 0.25—0.6 mm; stipules 0.25—1 (--1.5) mm; stigma lobes 2, ovary and fruit with 2 locules.>
4. Petioles 5--12 mm; leaf abaxial glands per side of midrib 1 or 2 proximal and adjacent or close to midrib with an additional 0 or 1 more distal halfway between margin and midrib and/or 0—10 more or less in a row closer to margin than midrib (rarely on margin) or occasionally random; ovary densely sericeous (rarely with few trichomes), styles connate; fruit 20—30 mm de largo y 14--20 mm de ancho, ellipsoid (sometimes nearly globose)… B. nitida
4. Petioles (1.5) 2—4 (6) mm; leaf abaxial glands per side of midrib (0) 1 (2) proximal and between midrib and margin (sometimes with an additional at leaf apex); ovary glabrous, styles free or connivent or connate but usually free apically or separating easily; fruit (10) 12--17 mm de largo y 10--14 mm de ancho, ovoid or globose … B. ocellata
1. Abaxial leaf surface tomentose or velutinous, the trichomes various but including either trabeculae sinuous and/or tortuous or long stalked (0.1—1.2 mm), pubescence persistent or patchily lost.
5. Young branchlets usually developing lenticels on flower-bearing portions, not obscured by pubescence; abaxial leaf surface frequently patchily glabrescent; abaxial surface of sepals glabrous or nearly so, sometimes eglandular or often glands poorly developed … B. mesoamericana
5. Young branchlets not developing lenticels on flower-bearing portions (or lenticels obscured by pubescence); abaxial leaf surface pubescence usually more or less persistent; abaxial surface of sepals usually densely pubescent at least medially, always glandular, glands normally developed.
6. At least some of the trichomes of the abaxial leaf surface with the trabeculae tortuous or sinuous and longest stalks 0.05—0.25 (0.3) mm; stigma lobes 2 or 3, ovary and fruit with 2 or 3 locules.
7. Stigma lobes 3, ovary and fruit with 3 locules; peduncle in flower absent to 0.5 mm (in fruit to 1 mm); inflorescences frequently bifurcate; mature fruit 8—12 mm de largo y 10—15 mm de ancho ….B. bifurcata
7. Stigma lobes 2, ovary and fruit with 2 locules; peduncle in flower 0.75—3.5 mm (in fruit to 5 mm); inflorescences simple pseudoracemes; mature fruit 15—25 de largo y 10—25 mm de ancho… B. heterotricha
6. Trichomes of the abaxial surface with the trabeculae straight to only slightly sinuous and longest stalks 0.25—1.5 mm; stigma lobes 3, ovary and fruit with 3 locules.
8. Trichomes of the abaxial surface with the longest stalks 0.25—0.4 (--0.6) mm; stipules (0.75) 1--2 (2.5) mm; distal abaxial glands per side of midrib (0) 1--8 (10) more or less in a row closer to margin than midrib (rarely halfway between midrib and margin), occasionally one gland out of alignment; sepals loosely cupping to spreading away from flower bud prior to anthesis …B. costaricensis
8. Trichomes of the abaxial surface with the longest stalks (0.2) 0.5—1.2 mm; stipules (2.5--) 3.5—9 mm; distal abaxial glands per side of midrib (6) 9—44 (--56) randomly arranged; sepals tightly appressed to flower bud prior to anthesis … B. macrophylla