PNGTreesKey – Brachychiton carruthersii F.Muell.
Barry Conn (NSW) & Kipiro Damas (LAE).
Guide to trees of Papua New Guinea
Copyright held by the authors, National Herbarium of New South Wales, and Papua New Guinea National Herbarium
Victorian Naturalist Vol. 3: 50 (1886)
Timber Group: Minor hardwood
Field Characters: Large canopy tree (up to 30 m high) or Small sub-canopy tree (up to 15 m high); Bole cylindrical (up to c. 75 cm diam.); straight (bole up to c. 20 m long); buttresses buttresses absent; spines spines absent; aerial roots aerial roots absent; stilt roots stilt roots absent; Bark green, rough or smooth, cracked or pustular, lenticels elongated laterally; Subrhytidome (under-bark) green; less than 25 mm thick (up to 10 mm thick), 10.0-15.0; bark blaze consisting of one layer; faintly to non-aromatic; unpleasant (turnip-like aroma); outer blaze white, markings absent, fibrous; inner blaze white, markings absent, fibrous; bark exudate (sap) absent; terminal buds not enclosed by leaves.
Indumentum: Complex hairs present, star-like (stellate); stinging hairs absent; mature twig indumentum (hairs) present, hairs dense to sparse (with stellate hairs).
Leaves: Leaves spaced along branches, spiral (leaves occurring singly at a node and arranged spirally up the branchlet), simple (a leaf composed of a single blade); petiole present, not winged, attached to base of leaf blade, swollen; leaves broadest below middle, 15.0-22.0 cm, 14.0-24.0 cm; symmetric (cordate), entire, dissected or lobed, palmately lobed, sub acute, venation palmate, secondary veins open, prominent, intramarginal veins absent; leaves lower surface pale green, upper surface pale green, indumentum (hairs) present, indumentum (hairs) dense (with stellate hairs) or sparse; absent; domatia absent; stipules present, free, laterally placed, not encircling the twig, leafy, fringed, large, not persistent or persistent.
Flowers: Inflorescence axillary, flowers on a branched axis, cones absent; flowers unisexual, unisexual with male and female flowers on the same plant, stalked, flowers with many planes of symmetry, 15.0-25.0 mm long, diameter large (more than10 mm diam.) (10-15 mm diam.); perianth present, with all sepals and/or petals (hence tepals) similar, inner perianth dull red, yellow (petal margin), or brown; 5, some or partly joined; stamens 5, absent, joined, free of the perianth; ovary superior, carpels separate (when more than one) (5), locules 5 (separate); styles short free, 5.
Fruits: Infrutescence arising from single point (appearing so because 5 separate fertilsed carpels of a single flower) or arranged on branched axis, fruit 180.0-200.0 (-225.0) mm long, 100.0 (c.) mm diam., brownish orange or brown (pale fawn-coloured), not spiny (slightly rough and hairy), non-fleshy, aggregate, dehiscent, follicle; seeds 100, about 10 mm long, not winged, narrow (longer than wide), seed 1-10 mm diam.
Distribution: Madang, Morobe (Cultivated), Central, Northern & Milne Bay.
in PNGplants database
Notes: Notes The genus Brachychiton was previously classified in the family Sterculiaceae.