IHchondrci] Lxxxvii. coNVOLVULACEiE. 723 



the most northern part, between 7° and 9 ', and JJichondra only 

 in the southern part, about 15° S. lat. 



Only three species of Cu scuta wei-e 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 18G0 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 iise : — 1. Ipoiwea Batatas 

 Poir. and /. digitata L. are cultivated in nearly all districts ; the 

 negroes eat also the leaves as spinach. 2. /. hiloha Foisk. might 

 be employed for consolidating sand-hills. 3. ,Ta^quemontia ovali- 

 folia Hallier f. is frequently eaten by the negroes like spinach, 

 and is very well flavoured. 4. Merremia angusti folia llallier f. 

 alfords 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. M. multisecta Hallier f. produces a substitute 

 for cottee. 



Lepistemon africanum Oliv. only is deleterious ; it is met wdth 

 in the mountainous region, where it is covered with stinging hairs, 

 which make cattle avoid the pastures to the same extent as does 

 Casao^ao, Tragia cordifolia Benth. (Welw. herb. no. 381). 



1. DICHONDRA Forst. ; Benth. & Hook. f. Gen. PI. 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.. I.e., 

 xviii. p. 82 (1893). 



D. evolvidacea Britton in Mem. Torr. Club v. 268. 

 Yar. /3. sericea Choisy in DC. Prodr. ix. p. 451 (1845). 



Bum P.O. — A herb, creeping far, in habit precisely resembhng 

 Uydrocotijle ; stem rooting at the nodes ; the whole plant clothed with 

 ashy silky hairs. In level fields after cultivation of Araclm hypogoea, 

 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. 626fj. 



2. EVOLVULUS L. ; Benth. & Hook. f. Gen. PI. ii. p. 875 ; 

 Hall. f. in Engl. Bot. Jahrb. xvi. p. 570 (1893). 



1. E. nummularius L. Sp. PI. edit. 2, p. 391 (1762); Hall, f.. 

 I.e., xviii. p. 85. 



E. dichondroides Oliv. in Trans. Linn. Soc. xxix. p. 117, t. 78. 



HuiLLA. — A pi'ocumbent herb, rooting at the nodes, deep green, 

 rather fleshy, apparently annual ; corolla subrotate, thinly membranous, 

 milk-white, with ovate obtuse lobes ; stamens exserted in consetiuenoe 

 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 LopoUo ; fl. and fr. 19 Feb. 



