Table 1.

Morphological comparisons of B.fangchengensis and relevant taxa.

Character	B.rotundilimba	B.sinovietnamica	B.fangchengensis
Rhizome	creeping, erect stem at anthesis; internode 2-3 cm long	elongate; internode 0.3-0.5 cm long	creeping; internode 0.3-1 cm long
Stipule	ovato-triangular, glabrous	oblong, pilose	triangular, pilose
Petiole	green, densely villous	reddish brown, densely villous	red, densely pilose
Leaves	blade adaxially green, glabrous	blade adaxially green, hirsute	blade adaxially bright green, smooth
Inflorescence bract	bracts glabrous, apex acuminate	bracts glabrous, apex acuminate	bracts apex 2-3 lobed, both pilose
Staminate flower	androecium actinomorphic, anthers oblong	anthers oblong, apex obtuse	androecium zygomorphic, anthers cuneiform, apex slightly bent and retuse
Pistillate flower	tepals 5, styles 3, ovary pilose, unequally 3-winged	tepals 4, styles 3, ovary sparsely pilose, subequally 3-winged	tepals 3-5, styles 3, ovary sparsely pilose, unequally 3-winged
Phenology (flowering; fruiting)	Apr; Jul	Jul; Aug	Nov; Jan
Habitat	alt. 1600-1800 m, Yunnan	alt. 230-400 m, Guangxi	alt. 198 m, Guangxi