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

        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 ± robust perennial herb to 1 m. tall, exceptionally to c. 2 m. tall; rootstock semi-woody, narrowly turbinate.
    Stem
    Stems solitary, sometimes several, branching above, ± crowded leafy below, green occasionally purple-tinged, ± glaucous, glabrous or sometimes sparsely setulose.
    Leaves
    Leaves ascending or ± appressed to the stem, sessile membranous mostly pinnatipartite with a linear rhachis, up to c. 30 cm. long, elliptic in outline, remotely denticulate on the margins, glabrous or the midrib setose beneath; terminal lobe up to c. 12 x 0.7 cm., linear-lanceolate; lateral lobes in c. 5 pairs, remote, up to c. 8 x 0.6 cm., linear-lanceolate; basal leaves sometimes smaller and undivided, linear-lanceolate, remotely dentate, their lower portions often persisting as chartaceous scales, dark-brown lanate in the axils.
    Synflorescence
    Synflorescences terminal, laxly paniculate or corymbiform; branches up to c. 50 cm. long, divaricate, glabrous.
    Capitulum
    Capitula stalked; involucres 15–23 x 6–8 mm. at time of flowering, increasing to c. 30 x 10 mm. in fruiting capitula, conical-cylindric becoming campanulate.
    Phyllaries
    Phyllaries imbricate increasing uniformly in length towards the inside, the outermost broadly ovate and rounded-obtuse, the innermost narrowly lanceolate and attenuate, ciliolate above otherwise glabrous, guttulate on exposed areas, usually glaucous, purple-tinged above and on the margins.
    Florets
    Florets c. 20 per capitulum.
    Corolla
    Corollas yellowish-green, 14–23 mm. long, overtopping the involucres; tube narrowly cylindric, pilose at the throat outside, ligule c. 11 x 1.5 mm., lorate.
    Fruits
    Achenes reddish-brown, c. 12 x 2.5 mm. including the 4–5 mm. long beak, narrowly flattened-ellipsoid, broadly-ribbed on the margins with 1–2 smaller ribs between, hispidulous; pappus several-seriate, of fine white, barbellate setae, c. 11 mm. long.
    [FTEA]

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

    Habit
    Perennial herb to 1(–2) m high; taproot semi-woody, over 2.5 cm in diameter, root-crown with old leaf-bases, lanate in the axils; stem usually solitary, pale glaucous green, sometimes purplish, bearing both leaves and capitula, glabrous or sparsely setose.
    Leaves
    Leaves ascending, pale glaucous green, sometimes with red-purple margin, sessile, membranous, mostly pinnatipartite, 5–35 cm long, base attenuate towards the amplexicaul part, rachis linear or narrowly lanceolate with 2–4 alternate lobes to 5 cm long and 0.3–0.6 cm wide, margins remotely denticulate, apices acute, glabrous or setose on the midrib beneath.
    Capitulum
    Capitula many, in lax panicles to 50 cm long; involucre conical-cylindric, lengthening to campanulate after flowering, 15–30 mm long; phyllaries glaucous green with reddish tinge, ovate to lanceolate, 2–28 mm long, acute, papillose, with little hair-tufts at the apices.
    Florets
    Florets ± 20; corolla pale yellow, tube cylindric, 8–10 mm long, pilose near the mouth, ligules 8–11 mm long, 1.5–2.5 mm wide.
    Fruits
    Achenes reddish brown, flattened ellipsoid, 8.5–10 mm including the 1.5–2 mm long beak, 1-ribbed on each side, minutely puberulous; pappus white, 9–13 mm long.
    Figures
    Fig. 20/7 (achene).
    Habitat
    Brachystegia woodland or roadside grassland; 950–1250 m
    Distribution
    T2 T8

    Images

    Distribution

    Native to:

    Angola, Malawi, Mozambique, Tanzania, Zambia, Zaïre, Zimbabwe

    Lactuca imbricata Hiern appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Welwitsch [3656] K000251893 Unknown type material

    First published in Cat. Afr. Pl. 1: 620

    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: 203 (1992).
    • Lawalrée, Dethier & Gilissen in Flore d'Afrique Centrale Compositae: Cichorioideae: 68, t. 14 (1986).
    • Dethier in Bulletin du Jardin Botanique National de Belgique 52: 380 (1982).
    • C. Jeffrey in Kew Bulletin 18: 449 (1966).
    • Hiern, Cat. Afr. Pl. Welw. 1: 620 (1898).

    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