170 XCVIII. ACANTHACEH (CLARKE). [ Hranthemum. 
Leaves entire. Inflorescence in long spikes of contracted linear panicles, 
terminal often peduncled; flowers one to each bract, or clustered 
(condensed simple or compound cymes) in the linear panicles ; bract 
minute; bracteoles 0. 
Species 50 (many of them very closely allied), scattered through the warmer parts 
of the world. 
This genus is frequently confounded with Rhinacanthus, which is easily separated 
by its anther-cells being one over the other. As to the pollen, I can find no definite 
line between the Spangen-pollen and the Rahmen-pollen of Lindau; the smooth 
depressions lateral to the stopples may unite in bands, while the central depression 
stops short of the pole (as depicted by Lindau for Graptophyllum). 
Rhachis of inflorescence and calyx with stalked glands 
(as well as hairs). 
Leaves usually 2-3 in. wide, when mature glabres- 
cent . . . . . . . - Ll. #. decurrens. 
Leaves 1-13 in. wide, when mature pubescent on the 
midrib beneath . . . . . . 2. E, senense. 
Rhachis of inflorescence with no stalked glands (often 
hairy). 
Species of West Africa. 
Flowers nearly all solitary in the axils of bracts on 
a slender spike . . 
Axillary dense cymes in a linear panicle, 
Rhachis of panicle glabrous . 
Rhachis of panicle pubescent . 
Species of East Africa. 
Rhachis of inflorescence glabrous, shining brown 
Rhachis of inflorescence pubescent or puberulous. 
Leaves ovate or elliptic. 
3. E. nigritianum. 
. E. hypocrateriforme. 
. E. ludovicianum. 
ne 
. 6. E. Hildebrandtit. 
Rhachis and calyx with few white bristly hairs 7. EZ. seticalya. 
Rhachis and calyx with dense minute papillose 
hairs. . : : . . . 8. E. subviscosum. 
Rhachis and calyx with several-celled hairs . 9, EH. Lindaui. 
Leaves large, narrowly elongate-obovate . 10. E. ardisioides. 
1. E. decurrens, Vees in DC. Prod. xi. 453. Branches glabres- 
cent, round or obscurely 4-lineate. Leaves commonly 4 by 2 in., up to 
9 by 32 in., at the base ovate, suddenly narrowed intoa long attenuation, 
when young sparsely pubescent, when mature glabrescent ; cystoliths 
in the upper surface very small, rather conspicuous, in the lower surface 
obscure; petiole (excluding the winged portion) rarely } in. long. 
Spikes 4—6 in. long, pubescent and with stalked glands; flowers mostly 
solitary, sometimes 2~3 subsessile. Calyx } in. long or rather more, 
glandular hairy. Corolla yellowish; tube 1 in. long, pubescent. 
Capsule 1 in. long, seeds } in. in diam.—A. Rich. Tent. Fl. Abyss. 1. 
158 ; T. Anders. in Journ. Linn. Soe. vii. 52 ; Zarb, Cat. Spéc. Bot. Pfund, 
32. Pseuderanthemum decurrens, Radlk. in Sitz.-ber. Bayr. Akad. x1. 
286; Lindau in Engl. & Prantl, Pflanzenfam. iv. 3 B. 330, and in 
Engl. Jahrb. xviii. 63, t. 2, fig. 58. ; 
Wile Land. Kordofan, Pfund, 435! 486! 444! Kotschy, 276! Htbiopia 
Kotschy, 450! Abyssinia, Quartin-Dillon § Petit, 298! Schimper, 773, 1463: 
British East Africa: Jur; Dimo, Schweinfurth, 4264! 
