Arisaema, Martius, 1831

Van, Hong Thien, Nguyen-Phi, Nga & Luu, Hong Truong, 2016, A new species of Arisaema (Araceae) from Vietnam, Phytotaxa 277 (1), pp. 90-94 : 93

Key to the species of Arisaema from Vietnam

Based on the available literature ( Pham-hoang, 2000; Gusman & Gusman 2006; Li et al., 2010; Boyce et al., 2012; Bruggeman et al., 2013; Hoang et al., 2015) and the authors’ field observations, the known Vietnamese species of Arisaema sect. Anomala can be distinguished by the following key:

1 Flesh of rhizome green ............................................................................................................................................. A. langbiangense

- Flesh of rhizome purplish or violet....................................................................................................................................................2

2 Spadix appendix naked at apex..........................................................................................................................................................3

- Spadix appendix with few or many filiform bristles at apex..............................................................................................................5

3 Spadix appendix club-shaped ......................................................................................................................................... A. claviforme

- Spadix appendix cylindrical...............................................................................................................................................................4

4 Spathe limb ovate ........................................................................................................................................................ A. petiolulatum

- Spathe limb obovate ........................................................................................................................................................... A. garrettii

5 Pseudostem present, long...................................................................................................................................................................6

- Pseudostem absent or inconspicuous.................................................................................................................................................7

6 Limb plain green ................................................................................................................................................................ A. petelotii

- Limb with white zone at base ........................................................................................................................................... A. victoriae

7 Spathe limb plain green.....................................................................................................................................................................8

- Spathe limb with white zone at base..................................................................................................................................................9

8 Spadix appendix 3.5 cm long, peduncle shorter than petiole ......................................................................................... A. omkoiense

- Spadix appendix 9–10 cm long, peduncle longer than petiole.......................................................................................... A. balansae

9 Spadix appendix entirely covered with numerous filiform bristles............................................................................ A. lihengianum

- Spadix appendix with few filiform bristles at apical centimetre only........................................................................ A. pingbianense