Genus:
Lactuca L.

Lactuca lasiorhiza (O.Hoffm.) C.Jeffrey

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

[FTEA]

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

Morphology General Habit
Perennial herb; root woody, to 3 cm in diameter, with densely long-hairy root-crown.
Morphology Leaves
Leaves usually absent at flowering stage, developing afterwards, in a rosette, lanceolate to broadly obovate, 2–9 cm long, 2–6.5 cm wide (lobed and to 29x8 cm in quercifolia form), base attenuate, margins with distant dark teeth, apex obtuse and mucronate, sparsely pilose, denser on the veins, the midrib densely hairy beneath.
Morphology Reproductive morphology Inflorescences Capitulum
Capitula (1–)4–24 in compact, dense, subsessile corymbs; inflorescence axes to 2 cm long, glabrous, with narrowly triangular bracts to 5 mm long; capitula with 10–14 florets; involucre 11–18 mm long; phyllaries grey-green marked with red, ovate or lanceolate, 4–15 mm long, acute or rounded, distally pilose and ciliate or sometimes glabrous with only the very apex densely hairy.
Morphology Reproductive morphology Flowers
Corolla bright yellow, tube cylindric, 8.5–9.5 mm long, ligule 8–10 mm long, ± 1.5 mm wide.
Morphology Reproductive morphology Fruits
Achenes 6.5–9 mm long including beak, ribbed, with a beak of 1–3 mm long; pappus white, 8–10 mm long.
Figures
Fig. 20/1 (achene).
Habitat
Bare stony ground, burned grassland; 1800–2900 m
Distribution
T4 T7

[FZ]

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

Morphology General Habit
An acaulescent perennial herb rarely more than 7 cm. tall; taproot large, semi-woody, up to c. 3 cm. in diam. at the apex; rootcrown very densely brown sericeous-lanate with hairs c. 2 cm. long.
Morphology Leaves
Leaves radical, appearing after flowering, c. 9(25) cm. long, mostly oblanceolate in outline, acute at the apex, attenuate to cuneate below, remotely denticulate to runcinate-pinnatifid, ± densely pilose to glabrescent, midribs lanate below.
Morphology Reproductive morphology Inflorescences Capitulum
Capitula erect, few to numerous, densely aggregated in a pulviniform synflorescence up to 10 cm. in diam.; flowering stalks congested, usually shorter than the capitula but occasionally up to c. 3.5 cm. long, partly or completely enveloped in the rootcrown hairs, simple or shortly branched, bracteate, glabrous to pilose, lanate in the axils; bracts 4–12 mm. long, lanceolate.
Morphology Reproductive morphology Inflorescences Bracts Involucre
Involucre 11–18 x 4–8 mm., cylindric to narrowly campanulate.
Morphology Reproductive morphology Inflorescences Bracts Phyllaries
Phyllaries 3–4-seriate, from c. 4 mm. long outside to c. 15 mm. long inside, lanceolate acute to acuminate, margins hyaline entire or remotely serrulate.
Morphology Reproductive morphology Flowers Corolla
Corollas c. 16 mm. long; tubes narrowly-cylindric, rugulose, puberulous above; ligules yellow, sometimes becoming reddish-purple outside, c. 10 mm. long, lorate, erect, glabrous, apical lobes densely papillose outside.
Morphology Reproductive morphology Fruits
Achenes dark-brown c. 9 mm. long including the beak, fusiform, apically attenuate into a beak c. 3 mm. long, narrowly-ribbed, scabridulous, glabrous; pappus copious several-seriate, of numerous barbellate setae up to 10 mm. long.

[FWTA]

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

Morphology General Habit
A perennial herb
Morphology General Exudate
A thick taproot yielding white latex
Morphology Leaves
The leaves appear separately from the tufted inflorescences which are about 2 in. high
Morphology Reproductive morphology Flowers Florets
Yellow florets in purplish involucres; ligules reddish outside.

Native to:

Cameroon, Central African Repu, Ghana, Malawi, Nigeria, Tanzania, Togo, Zambia, Zaïre, Zimbabwe

Lactuca lasiorhiza (O.Hoffm.) C.Jeffrey appears in other Kew resources:

First published in Kew Bull. 18: 438 (1966)

Accepted by

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

Literature

Flora of Tropical East Africa

  • C. Jeffrey in Kew Bulletin 18: 438 (1966).
  • G.V. Pope in Flora Zambesiaca 6: 197 (1992).
  • Lawalrée, Dethier & Gilissen in Flore d'Afrique Centrale Compositae: Cichorioideae: 48 (1986).

  • 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

  • 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