532 XCVI. BIGNONIACEH (SPRAGUE). [ Rhigozum. 
Lower Guinea. Angola: between Otyenyau and Chihinde, 4100 ft,, Baum, 
40! German South-west Africa: Damaraland, Een! Hereroland: Otyimbingue, 
3300 ft., Pechuel-Loesche ! 
Mozamb. Dist. Bechuanaland: Ngamiland; Kwebe Hills, Zugard, 35! 
Mrs. Lugard, 46! near Serowe, Schénland, 1619! 1627! flats between the 
Zuga and the Tamalakane Rivers, McCabe, 3! Matabeleland: Shasha River, 
Baines ! 
Also in South Africa. 
Three forms of this species may be distinguished : 1. drevispinosum proper, 
which has simple leaves, tomentose even in the adult state; 2. linifolium, which 
has simple leaves, puberulous in the adult state; and 3. spinosum, which has both 
trifoliolate and simple leaves, glabrous in the adult state. 
3. R. somalense, Hallier f. in Engl. Jahrb. xxxii. 127. An erect, 
nearly glabrous, thorny shrub, 3-10 ft. high. Branchlets virgate, 
terete, 1-14 lin. thick, glabrous, greyish. Leaves solitary or 2-4 
fascicled on minutely tomentose cushions, trifoliolate ; petiole slender, 
1-2 lin. long, slightly channelled ; leaflets orbicular-obeordate, about 
2 lin. long, 14 lin. broad, minutely glandular, the terminal one at- 
tenuate into its petiole, the lateral ones oblique, subsessile. Flowers 
solitary on the leaf-cushions. Pedicels 2-2} lin. long. Calyx cam- 
panulate, 1-14 lin. long, irregularly 2—3-lobed, subbilabiate, minutely 
and rather acutely 5-toothed, teeth pilose at the apex, calyx otherwise 
glabrous. Corolla yellow; tube funnel-shaped, 34-4 lin. long, pilose 
at the throat; basal cylindric portion 13-13 lin. long; lobes sub- 
orbicular, retuse, 24-3 lin. in diam., ciliate. Stamens distinctly 
exserted from the coroila-tube, inserted 21 lin. above its base; fila- 
ments about 2 lin. long; anthers 14 lin. long, not apiculate. Ovary 
i lin. long. Capsule not known. 
Wile Land. Somaliland: on mountains at Dadab, Ellenbeck, 165! 
Allied to the South .African R. obovatum, Burch., from which it differs in the 
size of the tlowers and shape of the leaflets. 
4. R.zambesiacum, Baker in Kew Bulletin, 1894, 32. An erect 
spiny shrub. Branchlets spreading. Leaves pinnate, 4-6 lin. long, 
solitary or fascicled on small, nearly glabrous cushions; common 
petiole 3—1 lin. long, slender; rhachis winged ; leaflets 5-9, very shortly 
stalked, elliptic or obovate, 13-3 lin. long, 3-14 lin. broad, puberulous 
or subglabrous. Flowers fascicled on the leaf-cushions. Pedicels 1-2 
lin. long. Calyx campanulate, subglabrous ; tube 14-2 lin. long ; lobes 
+ lin. long, roughly triangular, pilose at the apex. Corolla yellow, 
glabrous ; tube campanulate-funnel-shaped, 5-6 lin. long ; lower cylin- 
dric portion 2-2} lin. long, exceeding the calyx; limb ? in. ACTOSS ; 
lobes orbicular, 34 lin. in diam., crenulate. Stamens inserted 34-4) 
lin. above the base of the corolla-tube; filaments 2 lin. long ; anthers 
exserted, 2-3 lin. long, slightly apiculate. Ovary 3-1 lin. long. 
Capsule elliptic-oblong, 1} in. long, 54 lin. broad, beak 14 lin. long. 
Nucleus of seed elliptic ; hyaline wing 1-1} lin. broad.—K. Schum. 11 
Engl. Pf. Ost-Afr. C. 363 ; Sprague in Dyer, Fl. Cap. iv. ii. 452. 
Mozamb. Dist. Portuguese East Africa : Lower Zambesi; Tete, Kirk! 
Also in South Africa. 
