Belongs within: Malvaceae.
The Bombacoideae are a pantropical group of usually large trees with showy flowers. Well known members include the baobabs Adansonia of Africa and Australia whose swollen trunks may store water. Adansonia species have digitate leaves and indehiscent fruits. Bombax species are found in west Africa, southern Asia and northern Australia; the red cotton tree Bombax ceiba is widely grown as an ornamental. Kapok Ceiba pentandra is a native of South America and Africa which is cultivated for its cotton-like seed fibres.
Characters (Tang, Gilbert & Dorr): Trees, usually large, often deciduous; trunks sometimes spiny, often buttressed; bark fibrous, with mucilaginous exudates; indumentum usually stellate or tufted. Leaves alternate, spiral; stipules inconspicuous, caducous; petiole pulvinate; leaf blade often palmately compound, margin often entire. Inflorescences axillary, 1(or 2)-flowered, rarely many-flowered. Flowers bisexual, actinomorphic, large and showy. Epicalyx of 3 bracts, inconspicuous and caducous. Calyx shortly cylindrical, truncate, or irregularly 3-5-lobed, sometimes splitting. Petals 5, joined at base with androecium and falling as one unit, imbricate. Stamens usually very many (3-15 in Ceiba); filaments usually united in lower half into a filament tube around style, tube sometimes lobed, with stamens in 5 groups with completely united filaments and sessile anthers; anthers usually 1-celled, apparently 2-celled and non-septate in Ceiba, sometimes many anthers united into an apparent many-celled “super-anther”; pollen usually spheroidal, ± smooth, reticulate; staminodes absent. Ovary superior, syncarpous, carpels usually 5; ovules 2 to many per locule, axile, anatropous; style 5-lobed. Fruit a 5-valved capsule, or hard and indehiscent (e.g., Adansonia), many-seeded with seeds often embedded in endocarp hairs (kapok), less often fruit winged or juicy and few-seeded. Seeds sometimes winged.
<==Bombacoideae
|--Septotheca tessmanniiBS04, BAN98
`--+--+--GyrantheraBS04
| |--HuberodendronBS04
| `--BernoulliaBS04
`--+--+--CatostemmaBS04
| `--ScleronemaBS04
`--+--AdansoniaBS04
| |--A. digitataNDG98
| `--A. gregoriiVT13
`--+--BombaxBS04
| |--B. ceiba L. 1753 (see below for synonymy)C81
| | |--B. c. var. ceibaVT13
| | `--B. c. var. leiocarpumVT13
| |--B. discolorU16a
| |--B. ellipticumJ54
| |--B. emarginatumJ87
| |--B. insigneYZ02
| |--B. mitchelli Ettingshausen 1883F71
| |--B. sturtii Ettingshausen 1883F71
| `--B. valetoniiP88
`--+--Pachira [incl. Rhodognaphalon]BS04
| |--P. glabraBS04
| `--P. macrocarpaMH98
`--CeibaBS04 [incl. ChorisiaC-SQ08]
|--C. acuminataF11
|--C. aesculifoliaK06
|--‘Chorisia’ crispifloreU16b
|--C. erianthosC-SQ08
|--C. glazioviiC-SQ08
|--‘Chorisia’ insignisU16b
|--‘Chorisia’ integrifolia Ulbrich 1916U16b
|--C. jaibanaC-SQ08
|--C. pentandra (L.) Gaertn. 1791 [=Bombax pentandra L. 1753; incl. Eriodendron anfractuosum DC. 1824]C81
|--C. pubifloraC-SQ08
|--C. rubriflora de Carvalho-Sobrinho & de Queiroz 2008C-SQ08
|--C. schottiiC-SQ08
|--C. speciosaC-SQ08 [=Chorisia speciosaK06]
|--C. trichistandraF11
`--‘Chorisia’ ventricosaJ54
Bombacoideae incertae sedis:
PseudobombaxBS04
|--P. ellipticumF11
|--P. grandiflorumK06
`--P. septenatumK06
Bombacopsis fendleriK06
Spirotheca passifloroidesBS04, H11
AguariaBS04
Cavanillesia arboreaBS04, C-SQ08
EriothecaBS04
NeobuchiaBS04
Bombax ceiba L. 1753 [incl. B. malabaricum DC. 1824, Gossampinus malabarica (DC.) Merr 1927, Salmalia malabarica (DC.) Schott & Engl. 1832]C81
*Type species of generic name indicated
References
[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.
[BS04] Baum, D. A., S. D. Smith, A. Yen, W. S. Alverson, R. Nyffeler, B. A. Whitlock & R. L. Oldham. 2004. Phylogenetic relationships of Malvatheca (Bombacoideae and Malvoideae; Malvaceae sensu lato) as inferred from plastid DNA sequences. American Journal of Botany 91: 1863–1871.
[C-SQ08] Carvalho-Sobrinho, J. G. de & L. P. de Queiroz. 2008. Ceiba rubriflora (Malvaceae: Bombacoideae), a new species from Bahia, Brazil. Kew Bulletin 63 (4): 649–653.
[C81] Croft, J. R. 1981. Bombacaceae. In: Henty, E. E. (ed.) Handbooks of the Flora of Papua New Guinea vol. 2 pp. 4–18. Melbourne University Press.
[F71] Fletcher, H. O. 1971. Catalogue of type specimens of fossils in the Australian Museum, Sydney. Australian Museum Memoir 13: 1–167.
[F11] Fraga, R. M. 2011. Family Icteridae (New World blackbirds). In: Hoyo, J. del, A. Elliott & D. A. Christie (eds) Handbook of the Birds of the World vol. 16. Tanagers to New World Blackbirds pp. 684–807. Lynx Edicions: Barcelona.
[H11] Hilty, S. L. 2011. Family Thraupidae (tanagers). In: Hoyo, J. del, A. Elliott & D. A. Christie (eds) Handbook of the Birds of the World vol. 16. Tanagers to New World Blackbirds pp. 46–329. Lynx Edicions: Barcelona.
[J54] Jacobsen, H. 1954. Handbuch der sukkulenten Pflanzen: Beschreibung und Kultur der Sukkulenten mit Ausnahme der Cactaceae vol. 1. Abromeitiella bis Euphorbia. Gustav Fischer Verlag: Jena.
[J87] Judd, W. S. 1987. Floristic study of Morne La Visite and Pic Macaya National Parks, Haiti. Bulletin of the Florida State Museum—Biological Sciences 32 (1): 1–136.
[K06] Kwiecinski, G. G. 2006. Phyllostomus discolor. Mammalian Species 801: 1–11.
[MH98] Morikawa, H., A. Higaki, M. Nohno, M. Takahashi, M. Kamada, M. Nakata, G. Toyohara, Y. Okamura, K. Matsui, S. Kitani, K. Fujita, K. Irifune & N. Goshima. 1998. More than a 600-fold variation in nitrogen dioxide assimilation among 217 plant taxa. Plant, Cell and Environment 21: 180–190.
[NDG98] Neal, P. R., A. Dafni & M. Giurfa. 1998. Floral symmetry and its role in plant-pollinator systems: terminology, distribution, and hypotheses. Annual Review of Ecology and Systematics 29: 345–373.
[P88] Polunin, I. 1988. Plants and Flowers of Malaysia. Times Editions: Singapore.
[U16a] Ulbrich, E. 1916a. Malvaceae andinae novae vel criticae imprimis Weberbauerianae. II. Botanische Jahrbücher für Systematik, Pflanzengeschichte und Pflanzengeographie 54 (Beiblatt 117): 48–77.
[U16b] Ulbrich, E. 1916b. Bombacaceae andinae. Botanische Jahrbücher für Systematik, Pflanzengeschichte und Pflanzengeographie 54 (Beiblatt 117): 77–78.
[VT13] Vigilante, T., J. Toohey, A. Gorring, V. Blundell, T. Saunders, S. Mangolamara, K. George, J. Oobagooma, M. Waina, K. Morgan & K. Doohan. 2013. Island country: aboriginal connections, values and knowledge of the Western Australian Kimberley islands in the context of an island biological survey. Records of the Western Australian Museum Supplement 81: 145–182.
[YZ02] Yahya, H. S. A., & A. A. Zarri. 2002. Status, ecology and behaviour of Narcondam hornbill (Aceros narcondami) in Narcondam Island, Andaman and Nicobar Islands, India. Journal of the Bombay Natural History Society 99 (3): 434–445.