East Indian screw tree Helicteres isora, photographed by J. M. Garg.

Belongs within: Malvaceae.

The Helicteroideae is a tropical clade within the Malvaceae supported by molecular analysis. Baum et al. (1998) defined it as the most exclusive clade including Durio zibethinus and Helicteres isora.

Characters (from the Angiosperm Phylogeny Website): Petiole pulvinate; sepals connate, petals clawed, often with lateral constrictions; androgynophore +; stamens 10-many, usually with short tube and/or fascicles; pollen baculate or microverrucate to suprareticulate; outer and inner integuments 2 cells across; n = 9, 14, 20, 25, etc.

<==Helicteroideae BAN98
    |--+--Coelostegia BAN98
    |  |--Neesia BAN98
    |  |--Cullenia BAN98
    |  |--Kostermansia BAN98
    |  `--Durio [Durioneae] BAN98
    |       |--D. graveolens K03
    |       `--D. zibethinus BAN98
    `--+--Reevesia BAN98
       |--Triplochiton scleroxylon BAN98, V01
       |--Ungeria BAN98
       |--Neoregnellia BAN98
       `--Helicteres BAN98
            |--H. guazumifolia MM96
            `--H. isora BAN98

*Type species of generic name indicated


[BAN98] Baum, D. A., W. S. Anderson & R. Nyffeler. 1998. A durian by any other name: taxonomy and nomenclature of the core Malvales. Harvard Papers in Botany 3 (2): 315-330.

[K03] Kulip, J. 2003. An ethnobotanical survey of medicinal and other useful plants of Muruts in Sabah, Malaysia. Telopea 10 (1): 81-98.

[MM96] Mound, L. A., & R. Marullo. 1996. The thrips of Central and South America: an introduction (Insecta: Thysanoptera). Memoirs on Entomology, International 6: 1-487.

[V01] Vánky, K. 2001. The emended Ustilaginaceae of the modern classificatory system for smut fungi. Fungal Diversity 6: 131-147.

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