Genus:
Lactuca L.

Lactuca schulzeana Büttner

This species is accepted, and its native range is W. Central & S. Tropical Africa.

[FZ]

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

Morphology General Habit
An erect long-lived giant annual herb, up to 3(3.5) m. tall.
Morphology Roots
Taproot with several thick ± fleshy lateral roots.
Morphology Stem
Stem solitary simple up to c. 1.5 cm. in diam., striately ribbed hollow glaucous, sparsely setose below, glabrous above.
Morphology Leaves
Leaves cauline somewhat crowded below; the lowermost up to c. 32 x 12 cm., elliptic-lanceolate in outline, grossly lyrate-runcinate, apices acute to obtuse, bases cuneate-attenuate with midrib ± narrowly winged petiole-like and semi-amplexicaul, denticulate on the margins, glabrous or sparsely setose particularly on the midrib and main nerves beneath; the upper leaves decreasing in size towards the stem apex, becoming lanceolate, undivided and sessile, ± sparsely setose.
Morphology Reproductive morphology Inflorescences Synflorescence
Synflorescence elongate-paniculate; branches short, patent and much thinner than the stem axis, sparsely glandular setulose, bracteate; bracts foliaceous.
Morphology Reproductive morphology Inflorescences Capitulum
Capitula numerous stalked; involucres 6–8 mm. long at time of flowering, increasing to c. 12 mm. in fruiting capitula, cylindric to very narrowly campanulate.
Morphology Reproductive morphology Inflorescences Bracts Phyllaries
Phyllaries 4–5-seriate, purplish, glabrous, ciliolate above; the outermost c. 1.5 mm. long, ovate; the innermost up to c. 12 mm. long, lorate-lanceolate, obtuse to acute.
Morphology Reproductive morphology Flowers Florets
Florets c. 10 per capitulum.
Morphology Reproductive morphology Flowers Corolla
Corollas 10–12.5 mm. long, blue to purplish; tube c. 5 mm. long, narrowly cylindric, sparsely setulose about the outside of the throat; ligule c. 6.5 mm. long, oblanceolate-lorate, lobes c. 1 mm. long, apically papillose.
Morphology Reproductive morphology Fruits
Achenes dark-brown, c. 4.5 mm. long including a distinct 1 mm. long beak, c. 1.25 mm. wide, fusiform, 3–4-angled, 1-several-ribbed between the angles, minutely hispidulous; beak slender, discolorous; pappus several-seriate of white barbellate setae c. 5 mm. long.

[FWTA]

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

Morphology General Habit
An erect herb up to about 6 ft. high
Morphology Reproductive morphology Flowers Florets
Yellow or white florets in rather small heads in a wide diffuse panicle.

[FTEA]

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

Note
Does not occur in our area, contrary to distribution data in F.W.T.A

Native to:

Angola, Cameroon, Congo, Zambia, Zaïre

Lactuca schulzeana Büttner appears in other Kew resources:

Date Reference Identified As Barcode Type Status Has image?
Welweitsch [3658] K000251891 Unknown type material Yes
Maitland, T.D. [1749], Cameroon K000027610 No
Gossweiler, J. [668], Angola K001307261 No
Maitland, T.D. [1479], Cameroon K000027612 No
Maitland, T.D. [1749], Cameroon K000027611 No

First published in Verh. Bot. Vereins Prov. Brandenburg 31: 72 (1889)

Accepted by

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

Literature

Flora of West Tropical Africa

  • in Verh. Bot. Verein Brandenburg 31: 72 (1889).

  • 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