|The Cycad Pages
- Encephalartos laurentianus De Wild., "Etudes Fl. Bas et Moy - Congo 1: 10, t. 25" (1903). H—BR
- "TYPE: Zaire, Kwango River, Kasongo-Lunda, Gentil 98, 21 Sep 1902 (holo BR)."
Honoring 19th Century Belgian collector Emile Laurent, who introduced
plants of this species into cultivation.
Described in 1903 by Belgain botanist
- De Willd..
Very long leaves; large thin leaflets; yellowish green cones with
persistent reddish brown tomentum and wrinkled scale apices; numerous long
stalked pollen cones
Distribution and habitat:
Angola and Zaire (DR of Congo), restricted to the Kwango River valley along
the common border, in closed gallery forest along the river and on open
1997 IUCN Red List of Threatened Plants
Plants arborescent; stem 15 m tall, 100 cm diam.
Leaves 400-700 cm long, dark green, highly glossy, flat (not keeled)
in section (opposing leaflets inserted at 180° on rachis); rachis green,
gently curved, somewhat lax, not spirally twisted; petiole straight; leaf-base
collar not present; basal leaflets reducing to spines.
Leaflets lanceolate, strongly discolorous, not overlapping, not
lobed, insertion angle horizontal; margins flat; upper margin heavily toothed
(more than 3 teeth); lower margin heavily toothed (more than 3 teeth); median
leaflets 35-50 cm long, 40-70 mm wide.
Pollen cones 2-6, ovoid, yellow, 17-35 cm long, 6-10 cm diam.
Seed cones 2-6, ovoid, yellow, 35-40 cm long, 18-20 cm diam.
Seeds ovoid, 40-50 mm long, 25-30 mm wide, sarcotesta red.