1. Family: Asteraceae Bercht. & J.Presl
    1. Genus: Lactuca L.
      1. Lactuca setosa Stebbins ex C.Jeffrey

        This species is accepted, and its native range is Tanzania to S. Tropical Africa.

    [FZ]

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

    Habit
    An erect perennial herb up to 95(120) cm. tall, from a stout fusiform taproot.
    Stem
    Stems solitary, simple below branching above, leafy with leaves ± crowded below, often purplish towards the base, sparsely to densely glandular-setose, or glabrescent; setae 0.5–2 mm. long, patent, gland-tipped.
    Leaves
    Lower leaves crowded or sub-rosulate, 3.5–16 x 2–6.5 cm., ± broadly elliptic or oblanceolate, acute to obtuse mucronate at the apex, cuneate below with a tapering-winged petiole-like midrib, irregularly denticulate, ciliate between the teeth, glabrous, or densely setose on the midrib, occasionally sparsely puberulent beneath, lateral nerves ± prominent beneath; upper leaves more spaced, decreasing in size towards the stem apex, becoming oblong-lanceolate sessile and semi-amplexicaul.
    Synflorescence
    Synflorescences corymbose-paniculate with spreading-ascending branches up to c. 25 cm. long, or contracted and ± globose; bracts subtending the lower branches foliaceous up to 3 cm. long and narrowly lanceolate.
    Capitulum
    Capitula shortly stalked or subsessile, often ± aggregated.
    Involucre
    Involucres 5–8 x 1.5–2 mm. at time of flowering, cylindric, increasing to c. 12 x 2.5 mm. in fruiting capitula.
    Phyllaries
    Phyllaries 3–4-seriate somewhat rugulose outside and ciliolate above, glabrous or rarely glandular-setulose on the midrib; the outermost c. 3 mm. long, ovate; the innermost up to c. 12 mm. long and lanceolate-lorate, obtuse, margins entire and narrowly hyaline.
    Florets
    Florets c. 5 per capitulum.
    Corolla
    Corollas yellow, 8–11.5 mm. long; tube narrowly cylindric; ligule 4–7 mm. long, lorate, lobes c. 1 mm. long apically papillose.
    Fruits
    Achenes not or hardly beaked, reddish-brown, 4.5–5.8 mm. long, narrowly ellipsoid, or obovoid and ± truncate above, somewhat laterally compressed, broadly ribbed on the margins with 2–5 narrower ribs between, hispidulous on ribs; pappus several-seriate, of numerous white barbellate setae c. 5.5 mm. long.
    [FTEA]

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

    Habit
    Perennial herb, scapose; stem(s) annual, 1–3, erect, 0.7–1.5 m high, bearing both leaves and capitula, sparsely to densely glandular-setose; roots tuberous, like a carrot.
    Leaves
    Leaves 4–9, of which 1–3 radical, sessile, elliptic or lanceolate, 3.5–16 cm long, 0.7–6.5 cm wide, base attenuate in radical leaves to subamplexicaul in cauline leaves, margins sinuate-dentate, apex acute or obtuse and mucronate, glabrous or beneath sparsely setose on the veins.
    Capitulum
    Capitula many, in lax panicles; stalks of individual capitula absent or up to 2 cm long; involucre cylindric, 7–12 mm long; phyllaries 3-seriate, lanceolate, 2.5–12 mm long, glabrous or nearly so, the very apex minutely puberulous.
    Florets
    Florets ± 5 per capitulum; corolla yellow, tube cylindric, 4–4.5 mm long, ligule 7–9 mm long, 2–2.5 mm wide.
    Fruits
    Achenes fusiform, 4.5–6 mm long, 3-ribbed on each side, minutely pilose, hardly beaked; pappus white, 4–6.5 mm long.
    Figures
    Fig. 20/3 (achene).
    Habitat
    Marshy grassland; 1400–1800 m
    Distribution
    T4 T7

    Images

    Distribution

    Native to:

    Malawi, Tanzania, Zambia, Zaïre, Zimbabwe

    Lactuca setosa Stebbins ex C.Jeffrey appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Fanshawe, D.B. [1747], Zambia K000251888 holotype

    First published in Kew Bull. 18(3): 444 (1966)

    Accepted by

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

    Literature

    Flora of Tropical East Africa
    • G.V. Pope in Flora Zambesiaca 6: 200 (1992).
    • Lawalrée, Dethier & Gilissen in Flore d'Afrique Centrale Compositae: Cichorioideae: 55, t. 11 (1986).
    • Dethier in Bulletin du Jardin Botanique National de Belgique 52: 375 (1982).
    • C. Jeffrey in Kew Bulletin 18: 444, fig. 5 (1966).

    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 2019. 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 2019. 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