AMORPHOPHALLUS VARIABILIS × AMORPHOPHALLUS TITANUM

Hybrid

PARENTAGE:

Amorphophallus variabilis × Amorphophallus titanum

HYBRIDIZER:

Ralph D. Mangelsdorff; Ralph Mangelsdorff; Indra Wirianto

HYBRIDS:

Amorphophallus lambii × (Amorphophallus variabilis × Amorphophallus titanum)

NOTES:

1. Named selections from this cross: 'John Tan', 'DiGeSt'.

2. Ralph D. Mangelsdorff: Amorphophallus variabilis (ovule) × Amorphophallus titanum (pollen); one seedling named Amorphophallus 'John Tan'.¹

3. Ralph Mangelsdorff: Amorphophallus variabilis (ovule) × Amorphophallus titanum (pollen), success (= A. 'John Tan') SEE ALSO: Claudel, C., Mangelsdorff, R. & Hetterscheid, W.L.A. 2012. The first successful hybrid of Amorphophallus titanum. Aroideana 36: 81–85.; reported 2012.²

4. Indra Wirianto: Amorphophallus variabilis 'Sluka's Dark Giant' (ovule) × Amorphophallus titanum (pollen); one seedling named Amorphophallus 'DiGeSt'; reported 2017.³

5. Reported in the Amorphophallus Facebook group: the first flowering for Steve Jackson in November 2019, when he credited the cross to Sluka Atthagatha;⁴ the leaf in May 2024, the cross now credited to Indra Wirianto;⁵ the first flowering for Matt Coulter in December 2025;⁶ Matt Coulter's plant in leaf in 2026;⁷ Tony Avent's plant, from Alan Galloway's collection, after flowering in 2026; he asked whether the cross was ever named.⁸

REFERENCES:

1. International Aroid Society Aroid Cultivar Registry: Amorphophallus 'John Tan'

2. Claudel, C. & A. Galloway. 2012. Hybridization of Amorphophallus – state of the art. Aroideana 35: 103–108.

3. IAS Aroid Cultivar Registry, record ff0fa399 (draft)

4. Steve Jackson, post in the Amorphophallus Facebook group, 6 November 2019

5. Steve Jackson, post in the Amorphophallus Facebook group, 15 May 2024

6. Matt Coulter, post in the Amorphophallus Facebook group, 16 December 2025

7. Matt Coulter, post in the Amorphophallus Facebook group, April 2026

8. Tony Avent, post in the Amorphophallus Facebook group, July 2026

Photographs submitted to the IAS Aroid Cultivar Registry by Cyrille Claudel

Photos by Ralph Mangelsdorff / Cyrille Claudel, from the Amorphophallus Hybrids Network website

Photos by Alan Galloway