Lactuca imbricata

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Lactuca imbricata

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Description

Perennial herb to 1(-2) m high; taproot semi-woody, over 2.5 cm in diameter, rootcrown with old leaf-bases, lanate in the axils; stem usually solitary, pale glaucous green, sometimes purplish, bearing both leaves and capitula, glabrous or sparsely setose. Leaves ascending, pale glaucous green, sometimes with red-purple margin, sessile, membranous, mostly pinnatipartite, 5-35 cm long, base attenuate towards the amplexicaul part, rachis linear or narrowly lanceolate with 2-4 alternate lobes to 5 cm long and 0.3-0.6 cm wide, margins remotely denticulate, apices acute, glabrous or setose on the midrib beneath. Capitula many, in lax panicles to 50 cm long; involucre conical-cylindric, lengthening to campanulate after flowering, 15-30 mm long; phyllaries glaucous green with reddish tinge, ovate to lanceolate, 2-28 mm long, acute, papillose, with little hair-tufts at the apices. Florets ± 20; corolla pale yellow, tube cylindric, 8-10 mm long, pilose near the mouth, ligules 8-11 mm long, 1.5-2.5 mm wide. Achenes reddish brown, flattened ellipsoid, 8.5-10 mm including the 1.5-2 mm long beak, 1-ribbed on each side, minutely puberulous; pappus white, 9-13 mm long.

from: Jeffrey, C. & Beentje, H. J. 2000: Cichorieae. – Pp. 63-108 in: Beentje, H. J. & Smith, S. A. L. (ed.), Flora of Tropical East Africa. Compositae (Part 1). – Kew.

Distribution

Africa: Angola (AngolanativeA,B,C,D,E,F,G,H,I); Malawi (MalawinativeA,D,E,H); Mozambique (MozambiquenativeA,D,E,H); Tanzania (TanzanianativeA,D,E,H); Zaire (ZairenativeA,D,E,H,I); Zambia (ZambianativeA,D,E,H,I); Zimbabwe (ZimbabwenativeA,D,H)

Bibliography

A. Beentje H. J. & Jeffrey C. - Cichorieae in Polhill R.M. (ed.), Flora of Tropical East Africa. Compositae 1. 2000
B. Figueiredo E. & Smith G. F., Plants of Angola in Strelitzia 22. 2008 (as Lactuca andongensis Hiern)
C. Hiern W. P., Catalogue of Welwitsch's African Plants 1(3). 1898 (as Lactuca andongensis Hiern)
D. Jeffrey C., Notes on Compositae: 1. The Cichorieae In East Tropical Africa in Kew Bull. 18 (3). 1966
E. Lawalrée A., Dethier D. & Gilissen E., Flore d'Afrique Centrale (Zaire-Rwanda-Burundi). Spermatophytes, Compositae I. 1986 (as Lactuca hockii De Wild.)
F. Mendonça F. A., Contribuições para o conhecimento da flora de Angola 1(1). 1943
G. Mendonça F. A., Contribuições para o conhecimento da flora de Angola 1(1). 1943 (as Lactuca andongensis Hiern)
H. Pope G. V., Flora Zambesiaca 6(1). 1992
I. Pope G. V., Flora Zambesiaca 6(1). 1992 (as Lactuca imbricata var. hockii (De Wild.) Dethier)