Austrobuxus Miq.

Genus

Angiosperms > Malpighiales > Picrodendraceae

Characteristics

Shrubs to trees, dioecious; latex absent. Indumentum of simple hairs, most parts glabrescent; glandular and stinging hairs absent. Stipules absent (Malesia). Leaves simple, decussate; axillary buds usually covered by two relatively big scales, easily mistaken for stipules; petiole channelled above; blade symmetric, coriaceous, base attenuate to cuneate, margin entire to very laxly crenulate, flat to recurved, with very small glandular dots or teeth in shallow cavities, drying blackish; venation pinnate, generally indistinct, nerves looped and closed near margin, veins reticulate. Inflorescences axillary, imperfectly cymose, often thyrsoid, staminate ones with several flowers per node, pistillate ones generally with one flower or flowers in small groups per node; bracts hairy outside, glabrous to slightly hairy inside. Flowers actinomorphic; pedicel slightly hairy, glabrescent; sepals imbricate, glabrous to slightly hairy outside; petals absent. Staminate flowers pale green to yellowish to white, fragrant; pedicel cylindrical; sepals free, reflexed, the 2 outer ones smaller; stamens 4-9 (Malesia), around a raised receptacle, filaments glabrous; anthers elliptic, between basi-and dorsifixed, opening latro-extrorsely with longitudinal slits; pistillode absent, but receptacle raised and pistillode-like. Pistillate flowers: pedicel often elongating in fruit; sepals 4-8, ovate, tightly together in the young flower, apex rounded, outer ones very thick (and if present, inner ones thinner, with membranous upper margin); ovary 2-4-locular, 2 ovules per locule; style absent, stigmas short, reniform to completely split, shortly papillate above. Fruits regmas, red, exo-and mesocarp detaching, endocarp woody, dehiscing into 2-valved cocci from base to apex, completely loculicidal, partly septicidal; persistent column very slender, basally with collar of carpel remnants, apically shortly T-shaped. Seeds obovoid, at most one developing per locule, the others abortive, shiny, caruncle yellowish to black when dry, orange to deep red when fresh, consisting of short to longer papillae.
More
Shrubs or trees, dioecious, evergreen, perennial; stems and foliage without latex. Indumentum of simple, multicellular trichomes; glandular trichomes absent; stinging trichomes absent. Stipules entire, small or ± obsolete, deciduous. Leaves opposite or alternate, petiolate, entire or rarely crenate, elobate, penninerved; glands absent. Inflorescences axillary, racemose, solitary, unisexual, with flowers in bracteate clusters. Male flowers pedicellate; sepals imbricate, 2+2 or 3+3; petals absent; receptacle convex; stamens 2–25, with filaments free and arising from pits in the receptacle; anthers dorsifixed, bilobate, with thecae oblong and longitudinally dehiscent; pistillodes absent. Female flowers pedicellate; sepals imbricate, 2+2 or 3+3; petals absent; disc shortly cupular or obsolete; ovary 2-or 3-locular; locules biovulate or rarely uniovulate; styles 2 or 3, subsessile, ovate-subulate, transversely reniform or linear-subulate, generally free. Fruit capsular, smooth, 2-or 3-locular, dehiscing septicidally into 2 or 3 bivalved cocci. Seeds obloid or ovoid; testa crustaceous; albumen fleshy; caruncle much divided and conspicuously arilloid; cotyledons broad, flat.
Life form perennial
Growth form
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Foliage retention evergreen
Sexuality dioecy
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Environment

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Hardiness (USDA) 9-12

Usage

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Cultivation

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