Typhonium, Schott, 1829

Li, Yi F. & Wang, Qing L., 2024, Typhonium parvum (Araceae), a new species of Hainan Island, China, Phytotaxa 663 (3), pp. 140-148 : 147

Key to species of Typhonium in China

1. In shallow water or water field, sterile zone of spadix fully covered with dimorphic staminodes ...................................................... ................................................................................................................................. ỡDzë头尖 T. flagelliforme ( Blume 1837: 134)

– In field or crack of rocks and limestone, sterile zone of spadix with neuter flowers at the base, rest naked.....................................2

2. Underground part a long, cylindric rhizome ........................................................... AE南ë头尖 T. hunanense ( Li & Liu 1983: 155)

– Underground part a short, tuberous rhizome......................................................................................................................................3

3. Neuter flowers globose or subglobose ................................................................................................. 小ë头尖 T. parvum , sp. nov.

– Neuter flowers clavate, fusiform or filiform ......................................................................................................................................4

4. Spathe limb lanceolate........................................................................................................................................................................5

– Spathe limb broadly triangular, or basal part triangular and apical part lanceolate ...........................................................................7

5. Staminodal flowers present separately above male zone ... 保Ɯë头尖 T. baoshanense Z.L.Dao & H.Li in Dao et al. (2007: 236)

– Staminodal flowers absent above male zone......................................................................................................................................6

6. Neuter flowers clavate to fusiform, white, spathe tube white inside................. aeṿë头尖 T. jinpingense ( Wang et al. 2002: 287)

– Neuter flowers clavate, yellow, purple at base, spathe tube purple inside ........................................................................................... ....................................................................................................... nḃë头尖 T. albidinervium (Tang & Li in Li et al. 1977: 105)

7. Lamina entire, or deeply 3-lobed, lobes linear......................................................... 三叶ë头尖 T. trifoliatum ( Li et al. 1977: 105)

– Lamina entire or deeply 3-lobed, lobes ovate to ovate-lanceolate .....................................................................................................8

8. Neuter flowers filiform, strongly curled but mostly directed downward and covering most of the female zone................................ ..................................................................................................................................... Ḷñë头尖 T. trilobatum ( Schott 1829: 732)

– Neuter flowers filiform to narrowly fusiform, curved to the same direction .....................................................................................9

9. Neuter flowers upcurved ................................................................................. ë头尖 T. blumei ( Nicolson & Sivadasan 1981: 494)

– Neuter flowers downcurved .................................................................................................. aeẑü T. roxburghii ( Schott 1853: 12)