Genus:
Lactuca L.

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

Morphology General 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.
Morphology 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.
Morphology Reproductive morphology Inflorescences 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.
Morphology Reproductive morphology Flowers Florets
Florets ± 5 per capitulum; corolla yellow, tube cylindric, 2–2.5 mm long, ligule erect, 4–5.5 mm long.
Morphology Reproductive morphology 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

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

[FZ]

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

Morphology General Habit
An erect perennial herb to c. 2.4 m. tall, from a semi-woody taproot.
Morphology 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.
Morphology 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.
Morphology Reproductive morphology Inflorescences Synflorescence
Synflorescence an elongate terminal panicle; branches up to c. 15 cm. long, slender, patent-ascending, sparsely setulose or glabrescent, bracteate.
Morphology Reproductive morphology Inflorescences 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.
Morphology Reproductive morphology Inflorescences Bracts 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.
Morphology Reproductive morphology Flowers Florets
Florets c. 5 per capitulum.
Morphology Reproductive morphology Flowers 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.
Morphology Reproductive morphology 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.

Native to:

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

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

Date Reference Identified As Barcode Type Status Has image?
Schweinfurth [4015] K000251874 Unknown type material Yes
Gossweiler, J. [13843], Angola K001307260 No
Maitland, T.D. [1396], Cameroon K000027613 No

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

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

  • 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

    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 2022. 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 2022. 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