170 xcviii. ACANTHACEiE (clarke). [Eranthenium, 



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 frecjuently confounded with Rhinncanthus, 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 OrapfophyUum). 

 llhachis of inflorescence and calyx with stalked glands 

 (as well as hairs). 

 Leaves usually 2-3 in. wide, when mature glabres- 



cent . . . . . . . . \. E. decurrens. 



Leaves l-l^ in. wide, when mature pubescent on the 



midrib ben'eath . . . . . . 2. E. senense. 



Ghachis 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 . . . . . 3. ^. nigritianum. 



Axillary dense cymes in a linear panicle. 



Rhachis of panicle glabrous . . . . A. E. hypocrateriforme. 



Rhachis of panicle pubescent . . . . 5. i". ludovicianum. 



Species of East Africa. 



Rhachis of inflorescence glabrous, shining brown . 6. E. Hildehratidtii. 

 Rhachis of inflorescence pubescent or puberulous. 

 Leaves ovate or elliptic. 



Rhachis and calyx with few white bristly hairs 7. E. seticalyx. 

 Rhachis and calyx with dense minute papillose 



hairs . . . . . . . 8. -E". subviscosum. 



Rhachis and calyx with several-celled hairs . 9. E. Lindaui. 

 Leaves large, narrowly elongate-obovate . 10. E. ardisioides. 



1. E. decurrens, Necs in DC. Prod. xi. 458. Branches glabres- 

 cent, round or obscurely 4-lineate. Leaves commonly 4 by 2 in., up to 

 9 by 8| in., at the base ovate, suddenly narrowed into a 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 J in. long. 

 Spikes 4-() in. long, pubescent and with stalked glands; flowers mostly 

 solitary, sometimes 2-8 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. Aby.ss. ii. 

 158 ; T. Anders, in Journ. Linn. Soc. vii. 52 ; Zarb, Cat. Spec. Bot. Pfund, 

 32. Pseud&i'anthemwm decurrens, Radlk. in Sitz.-ber. Bayr. Akad. xiii. 

 2HG ; Lindau in Engl, k Prantl, Pflanzenfam. iv. 3 B. 330, and in 

 Engl. Jahrb. xviii. 63, t. 2, fig. 58. 



Xrile I.and. Kordofaii, Pfund, 435! 436! 444! Kotschy, 276! ^Ethiopia, 

 Kotschy, 450! Abyssinia, Quartin-Billon Sf Petit, 298! Schimper, 773, 1463! 

 British East Africa: Jur ; Dimo, Schiceinfurth, 4264! 



