10 xcviii. ACANTHACEiE (burkill). [Thunhergia, 



One anther-lobe of the ventral stamens alone 

 spurred. 

 Bracteoles very acute . . . . . 40. jT. mollis. 



Bracteoles obtuse or subacute . . . 41. T. mellinocauUs. 

 Each anther lobe spurred. 



Petioles upwards of 2 in. long . . .42. T. petersiana. 

 Petioles less than 1 in. long .... 48. T. usambarica. 



Leaves narrowly lanceolate ..... 44. T. Scliweivfurtldi. 



Jjcaves sesHile ; stem tisually oldbroua. 



Leaves hastate . . . . . . . . 45. T. lathyroides. 



Leaves ovate, obovate, or more or less lanceolate. 



Leaves covered witli a thick felt of white hairs . 46. T. anrjolensis. 



Leaves hairy on both surfaces, obovate to linear- 

 lanceolate . . . . . . . 47. jT. ohlonf/i folia. 



Leaves hairy below, narrowly lanceolate . . .48. T. parvifoUa. 

 Leaves glabrous or rarely with few hairs on the 

 margin, more or less cordate at the base. 



Leave8<4 in. long 49. T. lancifolia. 



Leaves 2i in. long or less. 

 Leaves oblong. 



Bracts scabrid 50. T'. Jii/ah'nn. 



Bracts hirsute . . . . . . 51. T. cerinfhoides. 



Leaves lanceolate ..... 52. T. (/eniianoidea. 



Leaves linear. 



Leaves 1^-3 in. long ...... 53. 1. stellarioides. 



Leaves 9 in. long 54. jT. longifolia. 



1. T. rufescens, ZiTicZrm in Engl. Jahrb. xwii. 90. A shrub about 

 20 ft. high ; the young branches clad with rust-coloured hairs. Leaves 

 elliptic, abruptly prolonged into an acumination above, entire, when 

 young with scattered rust-brown hairs, G in. long, 2J in. wide ; petioles 

 ] in. long, more or less clad with rust-brown hairs. Flowers on 

 peduncles of 1 J in. in length ; bracteoles rather firm, elliptic, rounded 

 iibove, covered densely with short rust-brown hair outside, nearly 

 glabrous within. Calyx-teeth short. Corolla-tube 2 in. long, not, as 

 in its allies, strongly constricted towards the base, where outside is a 

 belt of stiff hairs ; lobes | in. long. Anthers acute above, with a crest 

 of bristly hairs below and a few scattered hairs above. Stigma with 2 

 nearly equal lips. 



Upper Guinea. Cameroons : pnmitive forest between Barombi-ba-Mbu and 

 Kake, Preuss, 432 ! 



2. T. vogeliana, Benth. in Hook. Niger Flm'a, 470. Shrub 8-15 ft. 

 high. Stems woody, when young quadrangular and with a few hairs at 

 the nodes. Leaves ovate or lanceolate-elliptic, acuminate, acute at the 

 base, up to 8 in. long, 2-3J in. broad, glabrous ; petioles about J in. 

 long. Flowers 3 or 4 together on small-leaved axillary branches, or 

 solitary ; peduncles glabrous, J-f in long ; bracteoles broadly ovate, 

 thick, rust-colourod, 7-10 lin. long and 5-8 broad, obtuse or mucronate, 

 glabrous. Calyx-teeth many, long. Corolla-tube straight, white, 

 1-J-1| in. long, clad with very small nairs ; lobes \ in. long, violet. 

 Anthers mucronate above, rounded and very unequal below, with bristly 

 hairs at the base and softer ones above. Stigma with two lips, nearly 

 equal in length, the uppermost inrolled. Capsule glabrous, \\ in. long, 

 the fertile part not abruptly narrowed into the acute beak. — T. kame- 



