Skip to main content
  1. Family: Acanthaceae Juss.
    1. Genus: Acanthus L.
      1. Acanthus austromontanus Vollesen

        This species is accepted, and its native range is SW. Tanzania.

    [FTEA]

    Acanthaceae (part 1), Kaj Vollesen, Flora of Tropical East Africa, 2008

    Habit
    Shrub to 3(–4) m tall; young stems puberulous or sparsely so.
    Leaves
    Leaves with petiole 0.5–1(–2) cm long; lamina elliptic or narrowly so in outline, largest 10–19 × 5.5–9 cm, deeply lobed with large triangular spine-tipped lobes, each lobe with a single spine on antrorse side, apex acute, spine-tipped, base truncate, beneath puberulous or sparsely so and with longer glossy hairs on midrib and larger veins, glabrous on lamina, above puberulous on midrib, otherwise glabrous; stipule-like interpetiolar leaves present (rarely absent), with lamina up to 7 mm long, spiny, soon caducous.
    Inflorescences
    Cymes 7–17(–20 in fruit) cm long; rachis sericeous-tomentose, with several pairs of sterile bracts at base; bracts with 3 prominent longitudinal veins, brown to purple, obovate, sparsely sericeous-puberulous or -pubescent, 2.7–3.7 cm long in middle of cyme, spine-tipped and with 15–28 large and small teeth per side, longest 8–12 mm, small teeth inserted on large, teeth with scattered hairs near base only, less than 1 mm long; bracteoles lanceolate to obovate, 3.2–3.8 cm long, toothed in apical ½–3/4 with up to 25 teeth per side.
    Calyx
    Calyx green with purple apical part and teeth and yellow thickened part, sparsely to densely sericeous-pubescent; dorsal sepal 1–3-veined, ovate with long parallel-sided apical part, 3.5–4 cm long, acute, with 3–20 lateral teeth per side, longest tooth 3–5 mm long, ventral sepal 2-veined, obovate, 3.4–3.8 cm long, with 2 triangular lobes which are acute or 2–4-toothed and ± 8 mm long, with 6–17 lateral teeth per side, longest tooth ± 6 mm long, lateral sepals 1-veined, ovate-elliptic, 2.2–2.7 cm long, acuminate, without or with up to 12 lateral teeth per side (one side often with more than the other).
    Corolla
    Corolla tube white, limb deep purple; tube 6–7 mm long below thickened rim which is 8–10 mm long and deeply split dorsally; limb deflexed, 4–5.5 × 3–3.5 cm, finely and sparsely puberulous above and below; callus with broad central groove and two narrow lateral ridges.
    Filaments
    Filaments 2.7–3.3 cm long, glabrous; anthers, 4–5.5 mm long, with sparse long curly hairs on sides and sessile glands dorsally.
    Fruits
    Capsule ± 3 cm long.
    Seeds
    Seed (immature) discoid, glabrous, ± 8 × 6 mm.
    Distribution
    Range: Tanzania. Range: Not known elsewhere Range: Not known elsewhere Flora districts: T7
    Ecology
    Montane grassland and forest margins, occasionally used as a hedge plant; 2000–2300 m
    Note
    Clearly related to A. polystachius but with a much larger differently coloured corolla and with different bracts and calyx.

    Images

    Distribution

    Native to:

    Tanzania

    Other Data

    Acanthus austromontanus Vollesen appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Jan 1, 2007 Leedal, G.P. [7161], Tanzania K000772602 holotype
    Jan 1, 2007 Leedal, G.P. [7161], Tanzania K000772603 isotype

    Bibliography

    First published in Kew Bull. 62: 236 (2007)

    Accepted by

    • Vollesen, K. (2008). Flora of Tropical East Africa, Acanthaceae(1): 1-285.

    Literature

    Flora of Tropical East Africa

    • K.B. 62: 236 (2007).

    Sources

    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