1. Family: Rutaceae Juss.
    1. Genus: Zanthoxylum L.
      1. Zanthoxylum holtzianum (Engl.) P.G.Waterman

        This species is accepted, and its native range is S. Somalia to N. Mozambique.

    [FTEA]

    Rutaceae, J.O. Kokwaro (University of Nairobi). Flora of Tropical East Africa. 1982

    Habit
    Shrub or small tree 2–9 m. high, sometimes scandent; trunk with conical corky bosses 3.5–5 cm. in diameter; branches not or sparsely armed with straight or slightly recurved prickles 2–7 mm. long, glabrous or rarely brownish pubescent.
    Leaves
    Leaves 15–40 cm. long; rhachis usually unarmed, rarely with 1–2 prickles; petiolules (1.5–)2–4 mm. long, the terminal one up to 30 mm.; leaflets 3–4 pairs, opposite, ovate to elliptic or oblong-elliptic, 7–15 cm. long, 3–6.5 cm. broad, obtuse to acute or shortly acuminate at the apex, cuneate and occasionally asymmetric at the base, crenulate to minutely and obtusely serrulate, papyraceous, glabrous, densely dotted with pellucid glands; lateral nerves 8–12 pairs.
    Inflorescences
    Inflorescence a terminal pyramidal panicle 8–25 cm. long; flowers mostly in cymose clusters, rarely alternate, with pedicels (1–) 2–9 mm. long.
    Calyx
    Sepals 4, slightly united at the base, ovate to subcircular, 0.5 mm. long, ciliolate.
    Corolla
    Petals 4, 1.5–3 mm. long, 0.7–1 mm. broad, white.
    Male
    Male flowers:stamens 4; filaments 1–2.8 mm. long; anthers ± 0.8 mm. long; gynophore short, glabrous; vestigial ovary ovoid, lobed.
    Flowers
    Female flowers:staminodes 4, vestigial; gynophore ± 0.4 mm. long; ovary of 1 carpel, 1–1.5 mm. long; style 0.8–1 mm. long. Male flowers:stamens 4; filaments 1–2.8 mm. long; anthers ± 0.8 mm. long; gynophore short, glabrous; vestigial ovary ovoid, lobed.
    Female
    Female flowers:staminodes 4, vestigial; gynophore ± 0.4 mm. long; ovary of 1 carpel, 1–1.5 mm. long; style 0.8–1 mm. long.
    Fruits
    Fruit globose, 4–6 mm. in diameter, scarlet, densely gland-dotted.
    Seeds
    Seed compressed-globose, 3.5–4 mm. in diameter, shiny black.
    [FZ]

    Rutaceae, F. A. Mendoça. Flora Zambesiaca 2:1. 1963

    Habit
    Shrub or small tree (2) 3–15 m. high, sometimes scandent; trunk armed with conical corky bosses c. 5 cm. in diam.; branches, leaves and inflorescences sometimes shortly rusty- or brown-pubescent; stems ± sparsely aculeate with straight or slightly recurved aculei 2–7 mm. long; rhachis of leaves usually unarmed or rarely with 1 or 2 short aculei.
    Leaves
    Leaves 15–37 cm. long; leaflets papyraceous, 3–4-jugate, opposite, with petiolule (1·5) 2–4 mm. long, the terminal one with petiolule up to 30 mm. long; lamina 7–15 × 3–6·5 cm., ovate to elliptic or oblong-elliptic, densely dotted with pellucid glands, obtuse to acute or shortly acuminate at the apex, margin crenulate to minutely and obtusely serrulate, acute or obtuse and sometimes ± asymmetric at the base; lateral nerves 8–12 pairs.
    Inflorescences
    Inflorescence a terminal panicle 8–15 cm. long.
    Flowers
    Flowers in cymose clusters (rarely solitary) with pedicels (1) 2–3 mm. long; buds 2 mm. long, ellipsoid-cylindric. Female flowers: petals c. 3 × 1 mm.; staminodes 4, vestigial, reduced to the aborted anthers; gynophore c. 0·4 mm. long; ovary of 1 carpel, c. 1·5 mm. long, oblique; style lateral, c. 1 mm. long, incurved; stigma discoid, black. Male flowers: stamens 4; filaments linear, bent inwards near the apex in bud; anthers c. 0·8 mm. long, dorsifixed, deeply 2-lobed at the base, laterally dehiscent; disk or gynophore short, glabrous; vestigial ovary ovoid, obsoletely lobed.
    Calyx
    Sepals 4, 0·5 mm. long, slightly united at the base, ovate to subcircular, imbricate, persistent, margin ciliolate.
    Corolla
    Petals 4, 2·5 × 1 mm., white, imbricate.
    Male
    Male flowers: stamens 4; filaments linear, bent inwards near the apex in bud; anthers c. 0·8 mm. long, dorsifixed, deeply 2-lobed at the base, laterally dehiscent; disk or gynophore short, glabrous; vestigial ovary ovoid, obsoletely lobed.
    Female
    Female flowers: petals c. 3 × 1 mm.; staminodes 4, vestigial, reduced to the aborted anthers; gynophore c. 0·4 mm. long; ovary of 1 carpel, c. 1·5 mm. long, oblique; style lateral, c. 1 mm. long, incurved; stigma discoid, black.
    Fruits
    Fruit 5 mm. in diam., red, globose, densely gland-dotted.
    Seeds
    Seed compressed-globose, black.

    Images

    Distribution

    Native to:

    Kenya, Mozambique, Somalia, Tanzania

    Zanthoxylum holtzianum (Engl.) P.G.Waterman appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Nov 1, 1976 Senni [223], Somalia K000199413

    First published in Taxon 23: 364 (1975)

    Accepted by

    • Thulin, M. (ed.) in Thulin, M. (ed.) (1999). Flora of Somalia 2: 1-303. The Royal Botanic Gardens, Kew.
    • Kokwaro, J.O. (1982). Flora of Tropical East Africa, Rutaceae: 1-52.

    Literature

    Kew Backbone Distributions
    • Thulin, M. (ed.) in Thulin, M. (ed.) (1999). Flora of Somalia 2: 1-303. The Royal Botanic Gardens, Kew.
    Flora of Tropical East Africa
    • Waterm. in Taxon 24: 364 (1975).

    Sources

    Flora Zambesiaca
    Flora Zambesiaca
    http://creativecommons.org/licenses/by-nc-sa/3.0

    Flora of Tropical East Africa
    Flora of Tropical East Africa
    http://creativecommons.org/licenses/by-nc-sa/3.0

    Herbarium Catalogue Specimens
    'The Herbarium Catalogue, Royal Botanic Gardens, Kew. Published on the Internet http://www.kew.org/herbcat [accessed on Day Month Year]'. Please enter the date on which you consulted the system.
    Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/3.0/

    Kew Backbone Distributions
    The International Plant Names Index and World Checklist of Selected Plant Families 2020. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
    © Copyright 2017 World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

    Kew Names and Taxonomic Backbone
    The International Plant Names Index and World Checklist of Selected Plant Families 2020. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
    © Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0