Conamomum, Ridl., 1899

Ly, Ngoc-Sam, Hoang, Thanh-Son, Insisiengmay, Oudomphone, Haevermans, Thomas & Newman, Mark F., 2022, Conamomum vietnamense (Zingiberaceae), a new species from Tay Nguyen, Vietnam, Phytotaxa 531 (2), pp. 129-135 : 134-135

Key to the species of Conamomum in Cambodia and Vietnam

1. Stilt roots absent .................................................................................................................................................................................2

- Stilt roots present................................................................................................................................................................................3

2. Leaf blades 30–45 × 4.5–7 cm, ligules hairy, bracts rotting at early stage, calyx glabrous, corolla lobes reddish, labellum reniform, ovary glabrous ( Vietnam) .................................................................................................................................................. C. rubidum

- Leaf blades 25–30 × 3– 3.5 cm, ligules glabrous, bracts persistent, calyx pubescent, corolla lobes cream, labellum obovate, ovary hairy ( Vietnam).................................................................................................................................................................... C. odorum

3. Stilt roots ≥ 20 cm long, petiole 5–8 mm long, calyx bilobed, 12–14 mm long, and sparsely pubescent, labellum obovate-orbicular, ovary hairy, fruit smooth and hairy ( Vietnam) ............................................................................................................ C. vietnamense

- Stilt roots <20 cm long, petioles 20–30 mm long, calyx tridentate, 20–25 mm long and glabrous, labellum bowl-shaped, ovary glabrous, fruit finely ridged and glabrous ( Cambodia, Thailand) ................................................................................ C. pierreanum