Typhonium Schott 1829
Creators: name: Van, Hong Thien
name: Le, Van Son
name: Nguyen-Phi, Nga
name: Nguyen, Quoc Dat
name: Nguyen, Tran Quoc Trung
name: Nguyen, Hieu Cuong
name: Luu, Hong Truong
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Liliopsida
Alismatales
Araceae
Typhonium

description: Key to the 19 presently known Vietnamese species of Typhonium
Updated from Van et al. (2017).
1. Leaves perfectly trifoliolate........................................................................................................................................... T. thatsonense
- Not as above .......................................................................................................................................................................................2
2. Sterile interstice of spadix entirely covered with staminodes ..................................................................................... T. flagelliforme
- Only base of sterile interstice of spadix covered with staminodes.....................................................................................................3
3. Spathe limb thin, lanceolate, elongate-triangular...............................................................................................................................4
- Spathe limb thick, ovate to ovate-triangular.....................................................................................................................................14
4. Leaves fully pedate with 5 or 7 leaflets..............................................................................................................................................5
- Leaves entire and/or 3-lobed ..............................................................................................................................................................8
5. Leaves with 7 leaflets, leaf lobes linear to or linear-lanceolate............................................................................................. T. lineare
- Leaves with 5 leaflets, leaf lobes ovate, elliptic to elliptic-lanceolate ...............................................................................................6
6. Spadix much longer than spathe.................................................................................................................................... T. vermiforme
- Spadix almost as long as spathe .........................................................................................................................................................7
7. Ovaries obovoid; stigmas light yellow to white; staminodes subulate, with acuminate apices ................................... T. dongnaiense
- Ovaries elongate or lageniform; stigmas red; staminodes elongate-clavate, with dilated and flattened apices........... T. bachmaense
8. Spadix longer than spathe...................................................................................................................................................................9
- Spadix as long as or shorter than spathe...........................................................................................................................................12
9. Spathe limb corrugated.....................................................................................................................................................................10
- Not as above .....................................................................................................................................................................................11
10. Staminodes folded 180 o apically .............................................................................................................................. T. phuocbinhense
- Staminodes straight up to parallel to axis...................................................................................................................... T. corrugatum
11. Male zone cylindrical, staminodes cylindrical to conical ........................................................................................ T. khonkaenensis
- Male zone subglobose, staminodes clavate ..................................................................................................................... T. acetocella
12. Leaves entire....................................................................................................................................................................... T. laoticum
- Leaves incompletely trifoliolate .......................................................................................................................................................13
13. Stigma funnel shaped and lobed............................................................................................................................. T. stigmatilobatum
- Stigma disciform and unlobed............................................................................................................................................... T. huense
14. Spathe limb very strongly circinnately recoiled over the entire length......................................................................... T. circinnatum
- Not as above .....................................................................................................................................................................................15
15. Staminodes <3 mm long..................................................................................................................................................................16
- Staminodes> 5 mm long..................................................................................................................................................................17
16. Spathe 14–30 cm long, thecae opening by small pores....................................................................................................... T. hayatae
- Spathe 4.5–5.0 cm long, thecae opening by elongate slits .............................................................................. T. vietnamense sp. nov.
17. Staminodes subulate .............................................................................................................................................................. T. blumei
- Staminodes filiform..........................................................................................................................................................................18
18. Staminodes curly ............................................................................................................................................................. T. trilobatum
- Staminodes not curly .................................................................................................................................................... T. penicillatum
description: Published as part of Van, Hong Thien, Le, Van Son, Nguyen-Phi, Nga, Nguyen, Quoc Dat, Nguyen, Tran Quoc Trung, Nguyen, Hieu Cuong & Luu, Hong Truong, 2021, A new species and a new record of Typhonium (Araceae) from southern Vietnam, pp. 201-208 in Phytotaxa 527 (3) on pages 206-207, DOI: 10.11646/phytotaxa.527.3.4, http://zenodo.org/record/5751368