Olacaceae R.Br.
  • Narr. Exped. Zaire 452. 1818. (5 Mar 1818)


Cite taxon page as 'WFO (2021): Olacaceae R.Br. Published on the Internet;http://www.worldfloraonline.org/taxon/wfo-7000000421. Accessed on: 16 Jan 2021'

General Information

Shrubs, scandent shrubs, trees, or lianas, sometimes hemiparasitic, often glabrous. Lateral shoots sometimes with bud scales at base. Stipules absent. Leaves alternate, rarely opposite; petiole well developed; leaf blade simple, margin entire; veins usually pinnate, sometimes palmate and 3-5-veined. Inflorescences axillary, rarely also terminal, cymose, fasciculate, racemelike, spikelike, or umbellate, mostly small; bracts small and inconspicuous. Flowers usually bisexual, actinomorphic, 3-7-merous, sometimes heterostylous. Calyx small at anthesis, cupular, discoid, or lobed, sometimes accrescent to partly or wholly covering fruit, sometimes fused to fruit (in Schoepfia). Petals free or basally connate, valvate. Disk cuplike or annular, rarely free glands, sometimes accrescent and covering fruit apex (in Schoepfia). Stamens 3-15, rarely in part staminodes, epipetalous; anthers basi- or medi-fixed, usually 2-loculed, longitudinally dehiscent. Ovary usually superior, rarely semisuperior but sometimes apparently inferior through fusion with calyx, 2-5-loculed or semiloculed with apex of ovary 1-loculed; ovules solitary in each locule or semilocule, pendent from apex of free central placenta, usually anatropous, integuments 1 or 2. Style terminal, simple; stigma 2-5-lobed. Fruit a drupe, sometimes with an accrescent calyx. Seed solitary; testa thin; endosperm abundant; embryo small; cotyledons 2-4.

  • Provided by: [C].Flora Of CHina @ efloras.org
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    Morphology

    Disk often present, usually annular

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    Stamens free or rarely united into a column, the same number as and opposite the petals or fewer or more numerous, some often without anthers; anthers 2-celled, opening by slits or pore-like slits

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    Calyx-lobes imbricate or open in bud

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    Petals free or variously connate, valvate

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    Ovary superior or slightly immersed in the disk, 1–3-celled; style 1, with a 2–5-lobed stigma; ovules 1–5 from the apex of a central placenta in a 1-celled ovary, or pendulous from the inner angle of a 2- or more-celled ovary

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    Leaves alternate, simple; stipules absent

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    Flowers actinomorphic, usually hermaphrodite and small

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    Trees, shrubs or climbers

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    Seeds with copious endosperm and small or medium-sized straight embryo

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    Fruit drupaceous, sometimes inferior by accrescence of the calyx or receptacle

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    Calyx cupuliform, often accrescent, with the base free or more or less adnate to the ovary, and the margin entire or lobed

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    Petals 3–5 (6), valvate in bud, sometimes connate in pairs

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    Stamens as many as or more numerous than the petals, free or with the filaments more or less adnate to the petals, all fertile or some sterile

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    Disk present or inconspicuous

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    Trees or shrubs, sometimes armed with spines

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    Leaves alternate, simple, entire, penninerved, exstipulate

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    Flowers actinomorphic, bisexual, in axillary fascicles, cymes or racemes

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    Ovary free or more or less immersed, usually 3–5-locular at the base or nearly to the apex; style short, columnar; stigma capitate, sometimes lobulate; ovules (2) 3–5, pendulous from the apex of a central placenta

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    Seed with abundant fleshy endosperm; embryo minute, apical

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    Fruit drupaceous, ellipsoid to globose

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    Arbres'ou arbustes généralement monoïques, rarement sous-arbrisseaux, parfois plantes grimpantes ou hémiparasites.'Feuilles'alternes, exceptionnellement opposées, simples, entières, dépourvues de stipules.'Fleurs'le plus souvent ☿, actinomorphes, ordinairement de petite taille; calice petit, souvent accrescent et enveloppant le fruit,.à bord 3-6-denté généralement indistinct et à base cupuliforme libre ou soudée au disque ou à l'ovaire; pétales 3-6, valvaires ou exceptionnellement imbriqués, libres ou souvent connés surtout à la base, parfois connés par paire; disque absent ou présent, dans ce cas cupuliforme ou composé de glandes; étamines libres ou plus rarement soudées, disposées en 1,2 ou 3 verticilles, très souvent épipétales, généralement toutes fertiles, quelques-unes parfois staminodiales; anthères ovales ou allongées, à 2 ou rarement à 1 thèque, s'ouvrant par déhiscence longitudinale ou rarement par clapet; ovaire supère, semi-infère ou infère, dans ces deux derniers cas à base ± insérée dans l'axe cupuliforme, 2-5-loculaire à la base mais rarement jusqu'au sommet et contenant 1 ovule par loge ou 1-loculaire et contenant 2 ou 3 ovules; placentas généralement libres, fréquemment logés dans une dépression de la graine; ovules minces, longs, pendants, a-, uni- ou bitégumentés, anatropes à micropyle tourné vers le haut ou vers l'intérieur, rarement orthotropes à micropyle tourné vers le bas; style généralement au nombre de 1; stigmate petit, parfois 2-5-lobé, rarement subsessile.'Drupes'presque toujours uniséminées; parfois fausses drupes par suite de la soudure du fruit avec l'axe ou avec le calice accrescent devenu charnu ou encore par suite de l'accroissement du disque qui finit par envelopper presque complètement le fruit.'Graines à spermoderme mince; albumen abondant au sommet duquel se trouve le petit embryon.\n\t\t\tFamille presque exclusivement tropicale (Amérique du Sud, Afrique, Madagascar, Asie) comprenant 23 genres et environ 230 espèces; 9 genres, 19 espèces et 2 variétés sont actuellement connus au Congo belge.

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      Bibliography

     Information From

    Plants Of the World Online Portal - FZ
    https://www.kew.org/science/who-we-are-and-what-we-do/strategic-outputs-2020/plants-of-the-world-online
    http://www.plantsoftheworldonline.org/terms-and-conditions
    • A
    Plants Of the World Online Portal - FWTA
    https://www.kew.org/science/who-we-are-and-what-we-do/strategic-outputs-2020/plants-of-the-world-online
    http://www.plantsoftheworldonline.org/terms-and-conditions
    • B The Trustees of the Royal Botanic Gardens, Kew
    Flora Of CHina @ efloras.org
    http://www.efloras.org/flora_page.aspx?flora_id=2
    'Flora of China @ eFloras (2008). Published on the Internet http://www.efloras.org/flora_page.aspx?flora_id=2 [accessed August 2016]' Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
    • C Missouri Botanical Garden
    Flore d'Afrique Centrale
    https://www.floredafriquecentrale.be
    • D http://creativecommons.org/licenses/by/4.0/ Attribution 4.0 International (CC BY 4.0)
    Olacaceae
    World Flora Online Data. 2017.
    • E CC0 1.0 Universal (CC0 1.0).
    World Flora Online consortium
    http://www.worldfloraonline.org/organisation/WFO
    World Flora Online Data. 2018.
    • F CC0 1.0 Universal (CC0 1.0).