Shrubs or small trees, typically much branched, sometimes trichotomously; branches rigid, sometimes spine-tipped
Leaves
simple, trifoliolate or imparipinnate, solitary or fascicled on variously spaced, cushion-like, dwarf lateral branchlets
Flowers
in fascicles on lateral cushions or solitary, shortly pedicellate
Calyx
campanulate, 5-toothed, subglabrous to variously pubescent
Corolla
5-lobed, yellow, white or pink; tube ± cylindrical below, campanulate above, scantily pilose inside, at least on lower part of tube; lobes obovate, spreading
Stamens
5, arising near base of campanulate portion of corolla tube, slightly exserted; filaments terete, pilose at base; anthers oblong; thecae free at base only
Nectary
thick, shallowly saucer-shaped, entire or lobed
Ovary
ovoid, bilocular; ovules many, biseriate in each locule; style terete, slightly exserted; stigma of 2 ovate, somewhat fleshy lobes
Fruit
an oblong to elliptic, shortly-beaked, compressed capsule, splitting perpendicularly to septum into 2 smooth valves
Seeds
paper-winged
Nomenclature:
Rhigozum
Burch.
Burchell: 299 (1822)
Sprague: 450 (1904)
Sprague: 530 (1906)
Phillips: t. 381 (1930)
Merxmüller & Schreiber: 4 (1967)
Palgrave: 828 (1977)
Diniz: 67 (1988)
Distribution & Notes:
Global
: Species 7, Africa and Madagascar
Southern Africa
: Species 5, widespread except for Lesotho, mainly in karroid areas from Botswana to near Grahamstown (Eastern Cape)
Rhigozum trichotomum
Burch. has become invasive in several areas due to veld mismanagement
References:
BURCHELL, W.J. 1822.
Travels in the interior of southern Africa
, Vol. 1. Longman, Hurst, Rees, Orme & Brown, London
DINIZ, M.A. 1988.
Bignoniaceae
.
Flora zambesiaca
8,3
MERXMÜLLER, H. & SCHREIBER, A. 1967.
Bignoniaceae
.
Prodromus einer Flora von Südwestafrika
128
PALGRAVE, K.C. 1977.
Trees of southern Africa
. Struik, Cape Town
PHILLIPS, E.P. 1930.
Rhigozum brevispinosum
.
The Flowering Plants of South Africa
10
SPRAGUE, T.A. 1906.
Bignoniaceae
.
Flora of tropical Africa
4, 2
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