so 6 xciv. ACANTHACEvE. [N'elsonia 



caducous. In damp shady parts of palm groves on the left bank of 

 ■the river Cuango, rather rare ; fl. and fr. July 1855. No. 6216. A 

 low prostrate herb ; branches often rooting at the nodes, the flowering 

 branches suberect ; leaves membranous, sordid-green above, paler 

 beneath ; flowers densely clustered in terminal heads, very abundant ; 

 ■calyx 4-partite down to the base, two of the segments broader than 

 the rest, one of the two bifid at the apex ; corolla violet-blue, bilabiate, 

 the upper lip 2-lobed, the lower lip 3-lobed, all the lobes emarginate 

 or toothed at the apex ; the upper lip a little shorter than the lower, 

 saccate -gibbous behind at the base ; corolla- tube rather compressed, 

 whitish, but little curved, pilose only at the throat about the insertion 

 of the two very short stamens ; anthers white, semilunar, attached at 

 the hollow, touching each other on the sides ; pollen white ; ovary 

 sessile, ovoid-oblong ; style filiform, smooth ; stigma somewhat bilobed ; 

 capsule ovoid-conical, woody-beaked at the apex. In shady places at 

 the stream Cuango ; few fl. April 1856, and afterwards cultivated in 

 Welwitsch's Golungo garden. No. 5212. At the bank of the river 

 Cuango : fl. June 1856. No. 5213. In marshy woody places at 

 Catomba by the Luinha ; fl. and fr. July 1856. No. 5214. At the 

 river Cuango, near Quibolo : fl. and fr. July 1856. No. 5215. 



4. HIERNIA S. Moore in Journ. Bot. (1880) p. 196, t. 211 ; 

 Lindau in Engl. Nat. Pflanzenfam. iv. 36., p. 288 ; Burkill & 

 C. B. CI. in Fl. Trop. Afr. v. p. 5 (1899). 



There seems to me to be no sufl5.cient reason to doubt the correct- 

 ness of the position, as assigned by the author of the genus, namely, 

 in the tribe Nelsoniese. 



1. H. angolensis S. Moore, I.e., p. 197. 



Bumbo. — A rigid, viscid shrublet, much branched in a broomlike 

 manner ; flowers blue. In open forests composed of Copmba Mopane 

 O. Kuntze (Welw. herb. no. 605), near Quitibe de Cima, very plentiful ; 

 fl. and fr. June 1860. No. 5001. 



5. HYGROPHILA R. Br. ; Benth. k Hook. f. Gen. PI. ii. p. 1075. 

 JVomaphila Blume ; Benth. tfe Hook, f., I.e. 



1. H. uliginosa S. Moore in Journ. Bot. (1880) p. 197 ; Burkill 

 in Fl. Trop. Afr. v. p. 32 (1899). 



PuNGO Andongo. — Flowers violet-purple. In swampy places at the 

 jriver Lombe and near Bumba ; fl. and fr. March 1857. No. 5106. 



2. H. linearis Burkill, I.e., p. 35. 



HuiLLA. — A herb with the habit almost of a Grafiola, apparently 

 annual ; stems slender, tetragonal, here and there rooting at the nodes, 

 ascending ; leaves opposite, narrowly linear-lanceolate or sublinear, 

 spreading ; calyx deeply 5-clef t ; the lobes linear, acuminate ; corolla 

 violet in colour, puberulous outside, bilabiate, the upper lip emarginate, 

 the lower 3-lobed ; stamens 4, inserted on the posterior lip, included, 

 two of them sterile, with their filaments capitellate at the apex and 

 shorter than those of the fertile ones ; anthers of the fertile stamens 

 cordate-ovoid, attached at the sinus, 2-celled, the cells at length so 

 arched that the anthers become almost horseshoe-shaped ; ovary elon- 

 gated, 2-celled : style long, filiform ; stigma bilobed, the lobes more 

 or less cylindrical, and one of them not rarely obsolete or much shorter 

 than the other . capsule elongate-cylindrical, subcompressed, 2-celled, 



