Dichondra| LXXXVII. CONVOLVULACES. 723 
the most northern part, between 7° and 9°, and Dichondra only 
in the southern part, about 15° §. lat. 
Only three species of Cuscuta were met with, one a mountain 
plant at an elevation of 3000 to 4000 ft.; the second a coast 
plant between 15° and 16° S. lat.; and the third is not repre- 
sented in the herbarium ; this last has been apparently introduced 
from Portugal with cultivated seeds or in the soil of flower-pots, 
and it was noticed in November 1860 as growing sparingly on 
Impatiens Balsamina L. and on a large-leaved species of Ocimum, 
both of which were in cultivation at Loanda; it proved to be 
C. Chrysocoma Welw. 
The following are plants of economic use :—1. Jpomea Batatas 
Poir. and J. digitata L. are cultivated in nearly all districts; the 
negroes eat also the leaves as spinach. 2. J. biloba Forsk. might 
be employed for consolidating sand-hills. 3. Jacquemontia ovali- 
folia Hallier f. is frequently eaten by the negroes like spinach, 
and is very well flavoured. 4. Merremia angustifolia Hallier f. 
affords good fodder for cattle, and during the dry winter season, 
just where often no other green food is found, it occurs along 
extensive tracts. 5. MW. muiltisecta Hallier f. produces a substitute 
for coffee. 
Lepistemon africanum Oliv. only is deleterious ; it is met with 
in the mountainous region, where it is covered with stinging hairs, 
which make cattle avoid the pastures to the same extent as does 
Casiiogaio, Tragia cordifolia Benth. (Welw. herb. no. 381). 
1. DICHONDRA Forst.; Benth. & Hook. f. Gen. Pl. ii. p. 879; 
Hallier f. in Engl. Bot. Jahrb. xvi. p. 569 (1893). 
1. D. repens Forst. Char. Gen. p. 40, t. 20(1776) ; Hall. f., Z.c., 
xviii. p. 82 (1893). 
D. evolwulacea Britton in Mem. Torr. Club v. 268. 
Var. 8. sericea Choisy in DC. Prodr. ix. p. 451 (1845). 
Bumso.—A herb, creeping far, in habit precisely resembling 
Hydrocotyle ; stem rooting at the nodes ; the whole plant clothed with 
ashy silky hairs. In level fields after cultivation of Arachis hypogea, 
at the base of the mountains of Serra da Xella, especially about 
Bumbo, plentiful; fr. Oct. 1859. No. 626. <A luxuriant specimen 
growing with the last. No. 6260. 
2. EVOLVULUS L.; Benth. & Hook. f. Gen. Pl. ii. p. 875; 
Hall. f. in Engl. Bot. Jahrb. xvi. p. 570 (1893). 
1. E. nummularius L. Sp. Pl. edit. 2, p. 391 (1762); Hall. f., 
le., xvii. p. 85. 
E. dichondroides Oliv. in Trans. Linn. Soc. xxix. p. 117, t. 78. 
Huitita.—A_ procumbent herb, rooting at the nodes, deep green, 
rather fleshy, apparently annual ; corolla subrotate, thinly membranous, 
milk-white, with ovate obtuse lobes ; stamens exserted in consequence 
of the corolla-limb being rotate, but actually shorter than the limb ; 
anthers and style-branches white ; capsule 2-celled, the cells 1- or 
2-seeded. On dry hills by streams near Lopollo ; fl. and fr. 19 Feb. 
