Lactuca schulzeana

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Lactuca schulzeana

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Common names

Kongo (West and Central Africa): MumpongompongoA, Nongo NongoA

Description

An erect long-lived giant annual herb, up to 3(3.5) m tall. Taproot with several thick ± fleshy lateral roots. Stem solitary simple up to c. 1.5 cm in diam., striately ribbed hollow glaucous, sparsely setose below, glabrous above. 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. Synflorescence elongate-paniculate; branches short, patent and much thinner than the stem axis, sparsely glandular setulose, bracteate; bracts foliaceous. 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. 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. Florets c. 10 per capitulum. 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. 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.

from: Pope, G. V. 1992: Flora Zambesiaca 6, part 1. – London.

Distribution

Africa: AngolanativeA,B,C,D,E,F,G; CameroonnativeB,E,G,H; CongonativeB; NigerianativeB; UgandanativeB; ZairenativeA,E,G; ZambianativeG

Bibliography

A. Lawalrée A., Dethier D. & Gilissen E., Flore d'Afrique Centrale (Zaire-Rwanda-Burundi). Spermatophytes, Compositae I. 1986
B. Adams C. D. - Tribe XIII Cichorieae in Hutchinson J. & Dalziel J. M. (ed.), Flora of West Tropical Africa, ed. 2, 2. 292-297
C. Figueiredo E. & Smith G. F., Plants of Angola in Strelitzia 22. 2008
D. Hiern W. P., Catalogue of Welwitsch's African Plants 1(3). 1898 (as Lactuca macroseris Hiern)
E. Jeffrey C., Notes on Compositae: 1. The Cichorieae In East Tropical Africa in Kew Bull. 18 (3): 427-552. 1966
F. Mendonça F. A., Contribuições para o conhecimento da flora de Angola 1(1). 1943 (as Lactuca macroseris Hiern)
G. Pope G. V., Flora Zambesiaca 6(1). 1992
H. Beentje H. J., Onana J.-M., Pollard B. J. & Hind D. J. N. - Compositae in Cheek M., Onana J.-M. & Pollard B. J. (ed.), The plants of Mount Oku and the Ijim Ridge, Cameroon. A conversation checklist. 2000