Lactuca longispicata

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Lactuca longispicata

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Description

Perennial herb 0.3-1.3 m high; stem solitary, erect, unbranched, glandular-setose but glabrescent, the setae to 3 mm long; taproot woody. Leaves cauline, elliptic (proximal leaves) to linear (distal leaves), 3-26 cm long, 0.2-5 cm wide, base attenuate into a winged petiole in proximal leaves, sessile and semi-amplexicaul in distal leaves, margins sinuate-dentate and irregularly denticulate, apex obtuse and mucronate. Capitula in clusters of 2-6, these in turn arranged in lax leafy spiciform racemes up to 50 cm long, rarely in branched racemes; involucre 8-10 mm long, lengthening to 14 mm in fruit; phyllaries often purplish, lanceolate, 4-13 mm long, distally ciliolate. Florets ± 5 per capitulum; corolla yellow, tube cylindric, 4.5-6 mm long, ligule 4.5-6.5 mm long, papillose distally. Achenes dark brown to black, ellipsoid, flattened, 5-6 mm long including 0.5-1 mm long beak, 1-ribbed on each side; pappus white, 5-6 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: Tanzania (TanzanianativeA,B,C,D); Zaire (ZairenativeA,B,C,D); Zambia (ZambianativeA,B,C,D)

Bibliography

A. Beentje H. J. & Jeffrey C. - Cichorieae in Polhill R.M. (ed.), Flora of Tropical East Africa. Compositae 1. 2000
B. Jeffrey C., Notes on Compositae: 1. The Cichorieae In East Tropical Africa in Kew Bull. 18 (3). 1966
C. Lawalrée A., Dethier D. & Gilissen E., Flore d'Afrique Centrale (Zaire-Rwanda-Burundi). Spermatophytes, Compositae I. 1986
D. Pope G. V., Flora Zambesiaca 6(1). 1992