1	Apex of spadix appendix distinctly echinate or rugose; spathe margin entire		(2)
+	Apex of spadix appendix smooth, or rarely slender and slightly creased, or degenerate, if apex rugose then spathe margin ciliate around throat		(4)
2 (1)	Spadix appendix rugose.		77 A. taiwanense
+	Spadix appendix echinate		(3)
3 (2)	Tuber stoloniferous.		72 A. echinoides
+	Tuber not stoloniferous.		71 A. echinatum
4 (1)	Spadix appendix degenerate; spathe limb ± erect, involute.		68 A. exappendiculatum
+	Spadix appendix terete, stipitate or not		(5)
5 (4)	Pseudostem and peduncle much shorter than petioles, inflorescence positioned just above ground.		69 A. zhui
+	Pseudostem and/or petiole long, inflorescence distant from ground		(6)
6 (5)	Spathe basically yellow		(7)
+	Spathe basically green or purple		(8)
7 (6)	Underground stem subglobose tuber; spathe not striped; (?neuter flowers absent; ?infructescence nodding).		76 A. jingdongense
+	Underground stem subcylindric, longer than wide; spathe tube longitudinally striped with white and purple; neuter flowers present; infructescence upright.		75 A. muratae
8 (6)	Plants stoloniferous; spadix appendix upright or curved forward		(9)
+	Plants without stolons; spadix appendix upright		(10)
9 (8)	Spadix appendix slender, frequently curved forward at apex; infructescence upright.		78 A. concinnum
+	Spadix appendix cylindric; spathe margin ciliate around throat; infructescence nodding.		73 A. ciliatum
10 (8)	Spathe tube cylindric, basically greenish, limb occasionally tinged with purple.		74 A. erubescens
+	Spathe tube funnelform, usually purple outside, white inside.		70 A. sukotaiense