Typhonium species

Luu, Hong Truong, Tran, Ngoc Toan, Nguyen, Tran Quoc Trung, Phan, Cong Sanh & Nguyen-Phi, Nga, 2024, Two new species of Typhonium (Araceae) with bicolored staminodes from Central Vietnam, Phytotaxa 633 (2), pp. 163-170 : 168

Key to the eight Typhonium species with bicolored staminodes

1. Sterile interstice of spadix entirely covered with staminodes .................................................................................... T. flagelliforme

– Only base of sterile interstice of spadix covered with staminodes ....................................................................................................2

2. Leaves pedate with 7 leaflets .............................................................................................................................................................3

– Leaves entire, lobed to pedate with up to 5 leaflets ..........................................................................................................................4

3. Leaflets oblong-elliptic to narrowly elliptic, thick; spadix appendix stipitate; staminodes 6–8 mm long, obtuse or truncate at apex .............................................................................................................................................................................................. T. bicolor

– Leaflets elliptic to lanceolate, thin; spadix appendix sessile; staminodes 7–12 mm long, acute at apex ....................... T. kbangense

4. Leaves entire or lobed .......................................................................................................................................................................5

– Leaves pedate with up to 5 leaflets ....................................................................................................................................................7

5. Staminodes upward straight or slightly curved .................................................................................................................... T. blumei

– Staminodes downcurved ....................................................................................................................................................................6

6. Tuber broad, flattened; spathe tube 6–7 mm long; spathe limb greenish yellow or whitish; staminodes red with white apex .......... ............................................................................................................................................................................................ T. filiforme

– Tuber elongate, cylindrical; spathe tube 12–14 mm long; spathe limb green-brownish; staminodes pale purple with yellow apex. ................................................................................................................................................................................ T. culaochamense