Kaempferia species

Nopporncharoenkul, Nattapon & Jenjittikul, Thaya, 2017, Kaempferia noctiflora (Zingiberaceae), a new species from Northern Thailand, Phytotaxa 316 (1), pp. 67-72 : 71

Key to precociously flowering Kaempferia species in Thailand

1. Nocturnal anthesis; lateral staminodes pure white, labellum pure white or white with pale yellow from the base to sinus.............2

- Diurnal anthesis; lateral staminodes and labellum white, light pink to purple with deep purple spot at the center or base of labellum......................................................................................................................................................................................................3

2. Labellum deeply bilobed, divided more than 2/3 of labellum length; lateral staminodes and labellum laid on the same plane; leaves obovate to suborbicular, blades more than 15 cm in width, pale green often with slightly variegated pattern ................................... ........................................................................................................................................................................ Kaempferia grandifolia

- Labellum bilobed, divided to 1/2–2/3 of labellum length; lateral staminodes erect with deflexed distal half of the labellum; leaves ovate to elliptic, blades less than 12 cm in width, pale green to tinged purplish red, usually with tinged purplish red patch along the midvein............................................................................................................................................................. Kaempferia noctiflora

3. Labellum bilobed, divided to 1/2–2/3 of labellum length; lateral staminodes erect with deflexed distal half of the labellum; welldeveloped pseudostem with upright leaves........................................................................................................................................4

- Labellum deeply bilobed, divided more than 2/3 of labellum length; lateral staminodes and labellum laid on the same plane; short pseudostem with adpressed leaves flat on the ground........................................................................................................................5

4. Anther crest oblong to ovate, apex bilobed, each lobe acute; labellum white, pink to light purple with deep purple spot at the center ................................................................................................................................................................... Kaempferia rotunda

- Anther crest narrowly ovate to ovate, apex obtuse to shallowly trilobed, the middle lobe more elongated than outer lobes; labellum white to purple with deep purple spot at the center and prominent yellow patch from the base to sinus...... Kaempferia simaoensis

5. Labellum white to light pink with deep purple spot at the center and white patch from the base to sinus.......................................... ...................................................................................................................................................................... Kaempferia lopburiensis

- Labellum white, pink to purple with deep purple spot at the base................................................................... Kaempferia udonensis