Key to Arisaema taxa of Peninsular Malaysia

1. Subterranean stem a subglobose tuber (up to 3.5 cm in length, 1-5 cm wide) [sect. Fimbriata]............. 2

1a. Subterranean stem an elongated rhizome (up to 15 cm long) [sect. Anomalum]........................ 4

2. Spadix-appendix long and whip-like (8-15 cm long) exceeding the spathe-limb........................................ A. fimbriatum subsp. fimbriatum

2a. Spadix-appendix short (3-5 cm long) not exceeding the spathe-limb................................. 3

3. Spathe-limb inside white at base, vivid green from the apex to the basal white portion with a thin dark purple band separating the vivid green and white zones....................................... A. laminatum

3a. Spathe-limb inside pale yellow or pale green, sometimes suffused with purple................. A. roxburghii

4. Spadix-appendix short (2-5 cm long)............. 5

4a. Spadix-appendix long (10-35 cm long)........... 7

5. Leaf pedate, with 5-7 leaflets.......... A. scortechinii

5a. Leaf trifoliolate.............................. 6

6. Spathe-tube mouth margin strongly recurved (auriculate; auricles 5-10 mm wide).............. A. anomalum

6a. Spathe-tube mouth margin straight and hardly recurved (not auriculate).................. A. brinchangense

7. Leaf with 3-5 leaflets, leaflets linear-elliptic.... A. filiforme 7a. Leaf with 7-9 leaflets, leaflets elliptic........ A. wrayi