Tristemma] liv, melastomacetE. 365 



pluri-setose at the apex, girt at the throat with a short furfurfaceous 

 ring, adhering only to the base of the ovary ; tube inside naked, glossy, 

 polished ; petals 5 or 6 (on the same plant), inserted on the throat of 

 the calyx, broadly ovate, truncate at the base, rosy, rather fleshy, very 

 readily deciduous, scarcely J in. long, beset on one side with glandular- 

 ciliate hairs ; stamens 10 or 12 (even in the same flower-head 6 petals 

 and 10 stamens were noticed), inserted with the petals, ascending in a 

 curved manner ; anthers of two forms, each opening by one pore, 

 alternate larger, rosy, not yellow as the others, all arched ; ovarj' 

 superior, not half inferior, altogether embraced by the calyx, concave, 

 truncate at the top, 5-setulose at the apex, 5-celIed, with several ovules 

 in each cell ; capsule baccate, beautifully purple, urceolate, crowned 

 with the 5 reflected lobes of the persistent calyx, beset with a double 

 row of hairs, soft when ripe ; seeds very numerous, imbedded in pulp. 

 In moist very shaded woods and rugged situations at the sides of 

 streams amongst the mountains of Serra de Alto Queta, sporadic (as 

 are most of the species of this family seen by Welwitsch in Angola) ; 

 fl. 7 Jan. 1855, fr. end of May 1855 ; Mata do Mangue, fl. April 1856. 

 No. 900. 



2. T. albiflorum Beuth. in Hook. Niger Fl. p. 353 (1849) ; 

 Cogniaux in DC. Monogr. Phan. vii. p. 362 (1891). 



Melastoma albiflorum G. Don, Gen. Syst. ii. p. 764 (1832). T. 

 Schimaacheri, var. albiflorum Hook. f. in Oliv. Fl. Trop. Afr. ii. 

 p. 446. 



Island of St. Thomas. — On the more elevated rocky wooded parts 

 of Fazenda de Monte Gaffe, very sparingly ; not yet flowering, Dec. 

 1860. No. 922. 



This determination is very doubtful. 



3. T. littorale Benth. in Hook. Niger Fl. p. 353 (1849) ; 

 Cogniaux in DC. Monogr. Phan. vii. p. 362 (1891). 



T. Schumacheri, var. littorale Hook. f. in Oliv. Fl. Trop. Afr. ii. 

 p. 446. 



PuxGO Andongo.— A shrub, 6 ft. high, with sparse and rambling 

 branches ; stem simple at the base, as thick as a man's finger, purplish ; 

 flowers large, rose-purple. By swamps and in the waters of the river 

 Quanza at the island of Calemba ; the stem almost floating ; fr. and 

 few fl. 12 March, 1857. No. 906- 



3. DISSOTIS Benth. ; Benth. & Hook. f. Gen. PI. i. p. 746. 



1. D. capitata Hook. f. in Oliv. Fl. Trop. Afr. ii. p. 449 ; 

 Cogniaux in DC. Monogr. Phan. vii. p. 365 (1891). 



Heterotis cajntata Benth. in Hook. Niger Fl. p. 352 (1849). 

 Tristemma capitatum Triana in Trans. Linn. Soc. xxviii. p 56, 

 t. iv. f. 41d (1871). 



Var. Barteri Cogn., I.e. 



PuNGO Andongo.— An erect, shaggy undershrub, 2| to 3 ft. high. 

 In rocky thickets near streams in Serra de Pedras de Guinga ; fr. 

 March 1857. No. 903. An erect herb, 2 to 3 feet high ; rootstock 

 spongy ; stems numerous ; flowers pretty, purple. In damp thickets 

 between Quitage and Bumba ; fr. and few fl. March 1857. This de- 

 termination is doubtful. No. 903&. 



