Genus:
Lactuca L.

Lactuca praecox R.E.Fr.

This species is accepted, and its native range is Tanzania to Zambia.

[FZ]

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

Morphology General Habit
An erect subscapose perennial herb 7–55 cm. tall, from a narrowly turbinate rootstock.
Morphology Stem
Flowering stalks 1 -several ± diffusely branched, or much contracted and subpulviniform, glabrous or ± sparsely glandular-setose, bracteate; bracts foliaceous, sessile, up to c. 4 x 0.6 cm., very narrowly triangular, glabrous; branches mostly simple, up to c. 30 cm. long, divaricate-ascending, or much reduced, glabrous.
Morphology Leaves
Leaves poorly known, appearing after flowering, radical, dark-brown lanate in the axils, up to c. 10 cm. long, linear-oblong and sessile, or elliptic to narrowly ovate and broadly cuneate to attenuate at the base, margins ciliate-denticulate with teeth up to c. 1.5 mm. long; petiole-like midribs up to 4 cm. long, persisting as polished golden-brown scales.
Morphology Reproductive morphology Inflorescences Capitulum
Capitula precocious, numerous, sessile or stalked, solitary or in clusters of 2–4; stalks up to c. 5 cm. long, glabrous.
Morphology Reproductive morphology Inflorescences Bracts Involucre
Involucre 7–10 x 2.5 mm. at time of flowering, increasing to c. 17 x 3.5 mm. in fruiting capitula, cylindric to narrowly conical, later narrowly campanulate.
Morphology Reproductive morphology Inflorescences Bracts Phyllaries
Phyllaries glabrous, guttulate, green sometimes purple-tinged, ciliolate above, the outer from c. 3 mm. long and narrowly ovate, the inner to c. 16 mm. long and lanceolate.
Morphology Reproductive morphology Flowers Florets
Florets c. 5 per capitulum; corollas yellow, 12–16 mm. long, tube narrowly cylindric, ± densely pilose near the throat; ligules 10–14 x 3–4.5 mm., oblanceolate, ± pilose below, lobes papillose above.
Morphology Reproductive morphology Fruits
Achenes dark-brown to black, 8–9 mm. including a 2.5–3.5 mm. long paler beak, 1.5–1.75 mm. wide, narrowly ellipsoid, swollen-ribbed on the margins with 1 or sometimes 2–3 smaller ribs between, minutely antrorsely hispidulous; pappus several-seriate, copious, of fine white barbellate setae, c. 5 mm. long.

[FTEA]

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

Morphology General Habit
Perennial herb, subscapose; root with creamy latex, root-crown with old leaf-bases, sometimes long-woolly; flowering stem(s) 1–several, erect, brown or purplish, 6–55 cm high, laxly branched or strongly contracted, glabrous or sparsely setose; proximal bracts sessile, narrowly triangular, to 4 cm long and 6 mm wide.
Morphology Leaves
Leaves appearing after flowering, poorly known, in a rosette, lanceolate or ovate, 3–9 cm long, 1–4 cm wide, base cuneate, margins dentate and ciliate, apex acute, the purple midrib sparsely glandular-setose beneath.
Morphology Reproductive morphology Inflorescences Capitulum
Capitula precocious, many, in lax or contracted panicles 6–30 cm long; involucre cylindric or narrowly conical, 7–15 mm long; phyllaries brown or reddish green, ovate to lanceolate, 3–16 mm long, obtuse, glabrous except for a little hair-tuft at the very apex.
Morphology Reproductive morphology Flowers Florets
Florets 5–9 per capitulum; corolla yellow, tube cylindric, 2–3.5 mm long, pilose near the throat, ligules 10–14 mm long, 2.5–4.5 mm wide, distally papillose.
Morphology Reproductive morphology Fruits
Achenes red-brown to dark brown, flattened ellipsoid, 6.5–9 mm long including a 1.5–3.5 mm long paler beak, 3-ribbed on each side, minutely puberulous; pappus white, 4–9 mm long.
Figures
Fig. 20/6 (achene).
Habitat
Montane grassland and Brachystegia woodland, flowering after fires; 1500–2250 m
Distribution
T4 T7 T8

Native to:

Malawi, Tanzania, Zambia, Zaïre

Lactuca praecox R.E.Fr. appears in other Kew resources:

Date Reference Identified As Barcode Type Status Has image?
Mwangoka, M.A. [4099], Tanzania K000614923 No

First published in Wiss. Erg. Schwed. Rhodesia-Kongo-Exp. 1911-1912, 1: 352 (1916)

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: 449 (1966).
  • Dethier in Bulletin du Jardin Botanique National de Belgique 52: 376 (1982).
  • G.V. Pope in Flora Zambesiaca 6: 202, t. 36j (1992).
  • Lawalrée, Dethier & Gilissen in Flore d'Afrique Centrale Compositae: Cichorioideae: 49 (1986).
  • R.E. Fr. in Wiss. Ergebn. Schwed. Rhod.–Kongo Exped. 1: 352 (1916).

  • 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

  • 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