Boesenbergia species

Lý, Ng ọc-Sâm, 2017, Boesenbergia quangngaiensis (Zingiberaceae), a new species from Central Vietnam, Phytotaxa 324 (1), pp. 83-88 : 87

Key to Boesenbergia species in Vietnam

1. Anther crest absent.............................................................................................................................................................................2

– Anther crest present.......................................................................................................................................... Boesenbergia rotunda

2. Laminae elliptic to lanceolate.............................................................................................................................................................3

– Laminae ovate ............................................................................................................................................................. B. siphonantha

3. Infloresecence exserted from leaf sheaths; leaf base attenuate or cuneate.........................................................................................4

– Infloresecence not exserted from leaf sheaths; leaf base cordate...................................................................................... B. petiolata

4. Labellum with red at centre and at tip, glabrous; ovary glabrous; leafy shoots with> 5 leaves; petiole> 10 mm long; lamina lanceolate.................................................................................................................................................................................................5

‒ Labellum with deep red bands at the base to towards and reddish pink at the tip, densely glandular hairs; ovary hairy; leafy shoots with 2–4 leaves; petiole sessile or 2–3 mm long; lamina broad elliptic................................................................. B. quangngaiensis

5. Labellum bowl-shaped; calyx entire or 2-toothed; petioles 2–6.5(–10) cm; ligules 15–25 mm long, equal lobes; lamina lanceolate ............................................................................................................................................................................. B. xiphostachya

– Labellum orbicular; calyx with 3-short toothed; petioles 1.2–1.5 cm; ligules ca. 8 mm long, unequal lobes; lamina linear lanceolate ............................................................................................................................................................................. B. phyllostachya