Chisocheton Blume

Genus

Angiosperms > Sapindales > Meliaceae

Characteristics

Trees pachycaul to leptocaul, unbranched or, usually, with sympodial crown, sometimes laticiferous or myrmecophilous, very rarely foetid, dioecious or polygamous. Indumentum usually of simple, rarely of 4-stellate, hairs, sometimes irritant, with small glandular hairs. Leaves pinnate and pseudogemmulate or imparipinnate, very rarely paripinnate, to 2.4 m long; leaflets in 2–29 pairs. Inflorescence paniculate to thyrsoid or with long peduncle and congested racemose, axillary to supra-axillary, ramiftorous or rarely borne on congested cauliflorous branches, or epiphyllous (New Guinea). Flowers articulated with pedicel or inflorescence branches, sometimes with elongated receptacle (pseudopedicel). Calyx ± cupuliform, obscurely, rarely markedly, 3–6-lobed. Petals (3–)4–6(–14) in 1 (or 2) whorls, free, imbricate, quincuncial or alternative, often merely at apices, or valvate, rarely weakly united below or with base of staminal tube. Staminal tube cylindrical, sometimes weakly expanded or contracted at the mouth, margin entire, crenate or with 4–10(–30) emarginate, truncate or narrowly lanceolate 2-(or 3-)fid lobes; anthers (3–)4–10(–30), usually attached within the tube, alternating with lobes, usually locellate. Disk usually absent, less often stipitate, annular or patelliform, occasionally lobed. Ovary 2–8-locular, each locule with 1 or 2 collateral or superposed orthotropus ovules; stylehead clavate or discoid. Fruit a 2–5(–8)-valved loculicidal capsule, the valves 1– (or 2–)seeded; pericarp usually leathery or almost completely lignified, sometimes laticiferous. Seeds obovoid-spheroid to scutelliform or orange-segment-shaped, variously arillate or sarcotestal, orthotropous; hilum often large and heavily vascularized, whitish; aril reddish orange with ± free flap over black testa; sarcotesta red, tough; cotyledons collateral, oblique or superposed. Germination semihypogeal. 2n = 46, 94.
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Trees, dioecious or polygamo-dioecious. Leaves in spirals, large, pinnate, usually pseudogemmulate; leaflets opposite to subopposite; leaflet blades with margin entire. Inflorescences generally axillary thyrses or spikes. Flowers 4-6-merous, narrow and extended. Calyx cup-shaped or tubular, margin entire or ± dentate. Petals 4-6, distinct, linear-oblong, imbricate to valvate in bud. Staminal tube slightly shorter than petals, margin lobed or entire; anthers alternating with filament tube lobes, oblong, usually locellate. Disk usually absent, sometimes annular or shallowly cup-shaped, surrounding ovary. Ovary 2-4-locular, outside covered with thick trichomes, with 1 ovule per locule; style linear, much longer than ovary; stigma capitate. Capsule 2-4-locular, leathery, with 2-4 irregular valves. Seeds 1 or 2 per valve, thick, scutelliform to orange-segment-shaped.
Trees, dioecious or polygamous, with simple or 4-stellate hairs. Leaves pinnate and terminated by a pseudogemmula (not in some non-Australian species). Flowers sometimes with elongated receptacle (pseudopedicel), in thyrses or congested racemes on long peduncles, in axils or on branches or bole or even leaves (New Guinea). Calyx usually obscurely 3–6-lobed. Petals usually 4–6 in 1, rarely 2, whorls, usually free. Staminal tube usually cylindrical with entire or lobed margin; anthers usually 4–10, usually locellate. Disc usually absent. Ovary 2–8-locular, each locule with 1 or 2 ovules; stylehead clavate or discoid. Capsule loculicidal, usually 2–5-valved and leathery. Seeds obovoid-spheroid to scutelliform or orange-segment-shaped, orthotropous, arillate or sarcotestal.
Leaves pseudogemmulate, rarely imparipinnate or paripinnate. Inflorescences axillary, supra-axillary, cauliflorus, ramiflorous or borne on supra-axillary branches. Seeds arillate. White latex sometimes present in pith, pericarp etc. of some species.
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Hardiness (USDA) 8-12

Usage

UsesLocally, wood is used for construction but is not especially sought after.
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