10 XCVIII, ACANTHACE® (BURKILL). 
One anther-lobe of the ventral stamens alone 
spurred. 
Bracteoles very acute . 
Bracteoles obtuse or subacute 
Each anther lobe spurred. 
Petioles upwards of 2 in. long 
Petioles less than 1 in. long . 
Leaves narrowly lanceolate . . 
Leaves sessile ; stem usually glabrous. 
Leaves hastate. - . : : . . . 
Leaves ovate, obovate, or more or less lanceolate. 
Leaves covered with a thick felt of white hairs 
Leaves hairy on both surfaces, obovate to linear- 
lanceolate . . . : 
Leaves hairy below, narrowly lanceolate . . 
Leaves glabrous or rarely with few hairs on the 
margin, more or less cordate at the base. 
Leaves 4 in. long . . . . . . 49. T. lancifolia, 
Leaves 2} in. long or less. 
Leaves oblong. 
Bracts scabrid . . . . . . 50. T. hyalina, 
Bracts hirsute . . . . \ . A. T. cerinthoides. 
Leaves lanceolate . . . . . 52. T. gentianoides. 
Leaves linear. 
Leaves 14-3 in. long. . . . . . 53. 7. stellarioides. 
Leaves 9 in. long . . . . . . . 54, T. longifolia. 
1. T. rufescens, Lindau in Engl. Jahrb. xvii. 96. A shrubabout 
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, 6 in. long, 24 in. wide ; petioles 
1 in. long, more or less clad with rust-brown hairs. Flowers on 
peduncles of 1} in. in length ; bracteoles rather firm, elliptic, rounded 
above, 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: primitive forest between Barombi-ba-Mbu and 
Kake, Preuss, 432! 
2. T. vogeliana, Benth. in Hook. Niger Flora, 476. 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, 2-3} in. broad, glabrous ; petioles about } in. 
long. Flowers 3 or 4 together on small-leaved axillary branches, or 
solitary ; peduncles glabrous, }-} in long; bracteoles broadly ovate, 
thick, rust-coloured, 7-10 lin. long and 5-8 broad, obtuse or mucronate, 
glabrous. Calyx-teeth many, jong. Corolla-tube straight, white, 
11-1} in. long, clad with very small hairs ; 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, 1} in. long, 
the fertile part not abruptly narrowed into the acute beak.—7. kame- 
