Lactuca lasiorhiza

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Lactuca lasiorhiza

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Description

Perennial herb; root woody, to 3 cm in diameter, witty densely long-hairy root- crown. 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 29 x 8 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. Capitula (1-)4-24 in compact, dense, subsessile corymbs inflorescence axes to 2 cm long, glaurous, 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. Corolla bright yellow, tube cylindric, 8.5-9.5 mm long, ligule 8-10 mm long, ± 1.5 mm wide. Achenes 6.5-9 mm long including beak, ribbed, with a beak of 1-3 mm long; pappus white, 8-10 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: CameroonnativeA,B; Central African RepublicnativeB,C,D,E,F; GhananativeB,C,D,E,F; MalawinativeB,C,D,E,F,G; NigerianativeA,B,C,D,E,F; TanzanianativeA,B,C,D,E,F; TogonativeH; ZairenativeB,C,E,F; ZambianativeA,B,C,D,E,F,G; ZimbabwenativeB,C,D,E,F

Bibliography

A. Adams C. D. - Tribe XIII Cichorieae in Hutchinson J. & Dalziel J. M. (ed.), Flora of West Tropical Africa, ed. 2, 2. 292-297 (as Sonchus ledermannii R. E. Fr.)
B. Pope G. V., Flora Zambesiaca 6(1). 1992
C. Beentje H. J. & Jeffrey C. - Cichorieae in Polhill R.M. (ed.), Flora of Tropical East Africa. Compositae 1. 2000
D. Jeffrey C., Notes on Compositae: 1. The Cichorieae In East Tropical Africa in Kew Bull. 18 (3): 427-552. 1966
E. Lawalrée A., Dethier D. & Gilissen E., Flore d'Afrique Centrale (Zaire-Rwanda-Burundi). Spermatophytes, Compositae I. 1986
F. Strugnell A. M., A checklist of the Spermatophytes of Mt. Mulanje, malawi in Scripta Bot. Belg. 34. 2006
G. Burrows J. E. & Willis C. K., Plants of Nyika Plateau. An account of the vegetation of the Nyika National Parks of Malawi and Zambia in SABONET Report 31. 2005
H. Brunel J. F. & al., Flora analytique du Togo. 1984