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  1. Family: Asteraceae Bercht. & J.Presl
    1. Genus: Lactuca L.
      1. Lactuca schweinfurthii Oliv. & Hiern

        This species is accepted, and its native range is Cameroon to South Sudan and S. Tropical Africa.

    [FTEA]

    Compositae, H. Beentje, C. Jeffrey & D.J.N. Hind. Flora of Tropical East Africa. 2005

    Habit
    Perennial herb with erect stems 1.4–2.4 m high; taproot fleshy or semi-woody; stems solitary or in pairs, often purplish proximally, ribbed, sparsely glandular-setose with purple setae.
    Leaves
    Leaves all cauline, lanceolate, 4–24 cm long, 1–4.5 cm wide, base cuneate to rounded or semi-amplexicaul, margins sinuate-dentate, apex acute, sparsely setose to subglabrous.
    Capitulum
    Capitula many, in lax panicle to 40 cm long; involucre cylindric to narrowly campanulate, 6–10.5 mm long; phyllaries often purplish, ovate to lanceolate, 3–10 mm long, glabrous except for the ciliate margins in the outermost and the ciliate-lobed apices.
    Florets
    Florets ± 5 per capitulum; corolla yellow, tube cylindric, 2–2.5 mm long, ligule erect, 4–5.5 mm long.
    Fruits
    Achenes orange to dark brown, flattened ellipsoid, 4–4.5 mm long, not or hardly beaked, 1(–2)-ribbed on each side, minutely puberulous; pappus white, 3–5.5 mm long.
    Figures
    Fig. 20/4 (achene).
    Habitat
    Brachystegia woodland and grassland; 1750–2000 m
    Distribution
    T4
    [FWTA]

    Compositae, C. D. Adams. Flora of West Tropical Africa 2. 1963

    Habit
    A perennial herb erect hispid-setulose stems up to about 6 ft. high
    Inflorescences
    Inflorescence spreading with numerous flower-heads about 1/2 in. long
    Florets
    Florets mauve or yellow.
    [FZ]

    Compositae, G. V. Pope. Flora Zambesiaca 6:1. 1992

    Habit
    An erect perennial herb to c. 2.4 m. tall, from a semi-woody taproot.
    Stem
    Stems solitary simple striately ribbed, glaucous often purple-tinged below, sparsely glandular-setose; setae up to c. 3 mm. long, patent, usually dark-purple.
    Leaves
    Leaves cauline, somewhat crowded below; the lowermost up to c. 20 x 4.5 cm., lanceolate to narrowly elliptic undivided, acute, ± shallowly sinuate-dentate and irregularly denticulate on the margins, attenuate to rounded and shortly petiole-like at the base, glabrous or setose on the midrib and nerves beneath; upper leaves decreasing in size towards the stem apex becoming lanceolate sessile amplexicaul and sparsely setulose or glabrescent.
    Synflorescence
    Synflorescence an elongate terminal panicle; branches up to c. 15 cm. long, slender, patent-ascending, sparsely setulose or glabrescent, bracteate.
    Capitulum
    Capitula stalked, ± aggregated in loose clusters; involucres 6–8 x 1.5–2 mm. at time of flowering, increasing to c. 10 x 4 mm. in fruiting capitula, cylindric to narrowly campanulate, glaucous, often purple-tinged.
    Phyllaries
    Phyllaries 2–3-seriate, increasing in length towards the inside, ciliolate-pubescent above and often subapically corniculate; the outermost ovate, the innermost up to 10 mm. long, narrowly lanceolate, obtuse.
    Florets
    Florets c. 5 per capitulum.
    Corolla
    Corollas 8–10 mm. long, yellow; tubes slender, glabrous; ligule erect, c. 5.5 mm. long, narrowly obovate-lorate, lobes up to 1 mm. long, minutely papillose above.
    Fruits
    Achenes dark-brown to black, hardly or very shortly beaked, c. 4.5 x 2 mm., broadly ellipsoidal, strongly flattened, margins thickened, narrowly 1-ribbed or occasionally 2-ribbed on each face, minutely hispidulous; pappus several-seriate of white barbellate setae c. 5.5 mm. long.

    Images

    Distribution

    Native to:

    Angola, Burundi, Cameroon, Malawi, Sudan, Tanzania, Zambia, Zaïre

    Other Data

    Lactuca schweinfurthii Oliv. & Hiern appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Gossweiler, J. [13843], Angola K001307260
    Maitland, T.D. [1396], Cameroon K000027613
    Schweinfurth [4015] K000251874 Unknown type material

    Bibliography

    First published in Fl. Trop. Afr. 3: 452 (1877)

    Accepted by

    • Roskov Y. & al. (eds.) (2018). Species 2000 & ITIS Catalogue of Life Naturalis, Leiden, the Netherlands.

    Literature

    Flora of West Tropical Africa

    • in F.T.A. 3: 452 (1877).

    Flora of Tropical East Africa

    • G.V. Pope in Flora Zambesiaca 6: 201 (1992).
    • Lawalrée, Dethier & Gilissen in Flore d'Afrique Centrale Compositae: Cichorioideae: 58 (1986).
    • Dethier in Bulletin du Jardin Botanique National de Belgique 52: 381 (1982).
    • C. Jeffrey in Kew Bulletin 18: 448 (1966).
    • C.D. Adams in Flora of West Tropical Africa 3: 293 (1963).
    • F. W. Andr., The Flowering Plants of the Sudan 3: 38 (1956).
    • Oliv. & Hiern in Flora of Tropical Africa 3: 452 (1877).

    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

    Flora of West Tropical Africa
    Flora of West Tropical 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