224 XCVIII. ACANTHACE^ (CLARKE). [Adhatodci. 



bracts and bracteoles small. Calyx -j^ in. long. Corolla-tube y^ ^^' 

 long ; lobes J in. long. Anther-cells at unequal height ; lower long- 

 spurred. Ovary and style hairy. Capsule unknown. 



South Central. Congo Free State ; Towa Mountains, Descamps. 



This description reads like that of a Monechma; but without any knowledge of 

 the pistil it is vain to guess. 



46. RHINACANTHUS, Nees ; Benth. et Hook. f. Gen. PI. ii. 



1112. 



Sepals 5, nearly distinct, subequal, small, linear, hairy. Corolla 2- 

 lipped ; tube linear, longer than the lips ; anticous lip of 3 elliptic 

 lobes ; posticous linear-oblong or ovate-oblong, subentire. Stamens 2, 

 shortly exserted j anthers 2, one somewhat below the other, at the base 

 acute, not tailed, or in R. subcaudatus shortly tailed ; pollen ellipsoid, 

 stopples 3 on the three smooth bands which do not quite reach the poles. 

 Ovary hairy ; ovules 2 in each cell ; stigma of 2 small lanceolate sub- 

 equal lobes. Capsule stalked, oblong, 4-seeded; placentae not rising 

 elastically from the base of the valves ; seeds covered with tubercles. — 

 Rambling. Leaves entire, margins often obscurely undulate-crenate. 

 Flowers in sessile distant clusters on the branches of the panicle ; bracts 

 and bracteoles very small, linear. 



Species 3 or 4, in Africa and India. 



Leaves in the opposite pairs equal in length. 



Lower leaves narrowed at the base, ovate-lanceolate. 1. B. communis. 



Lower leaves rounded or subcordate at the base . 2. R. rotundifolius. 



Leaves in the opposite pairs unequal in length . . 3. J2. subcaudatus. 



1. R. communiSy Nees in Wall. PL As. Ear. iii. 109. Sparingly 

 pubescent. Leaves 2-5 in. long, ovate to lanceolate, scarcely acute, 

 nearly glabrous, base narrowed except in the upper floral leaves (which 

 are sometimes sessile and sub-cordate) ; petiole 0-\ in. long. Panicle 

 (in most of the East African examples as in India) 6-12 in. long, with 

 few floral leaves, much-branched and with very many clusters of flowers ; 

 in most West African examples the panicle has many floral leaves, 

 1-3 in. long, and the flower-clusters are few. Bracts ^-\ in. long, 

 linear. Calyx \-\ in. long. Corolla-tube J in. long, linear to the top ; 

 lips J in. long, posticous linear-oblong. Capsule | in. long, thinly hairy ; 

 seeds finally black.— Nees in DC. Prod. xi. 442 ; Wight, Ic. t. 464 ; T. 

 Anders, in Journ. Linn. Soc. vii. 51 ; C. B. Clarke in Hook. f. Fl. Brit. 

 Ind. iv. 541 ; S. Moore in Journ. Bot. 1880, 342 ; Oliv. in Trans, Linn. 

 Soc. ser. 2, Bot. ii. 346 ; Lindau in Engl. Jahrb. xviii. 63, t. 2 fig. 68. 

 li. gracilis, Klotzsch in Peters, Reise Mossamb. Bot. 218 ; Lindau in 

 Engl, k Prantl, Pflanzeufam. iv. 3 B. 339, and in Engl. Pfl. Ost-Afr. C. 

 371. R. nasutus, Lindau in Engl. & Prantl, Pflanzenfam. iv. 3 B. 339, 

 and in Engl. Pfl. Ost-Afr C. 371. Justicia nasuta, Linn. Sp. Plant. 16 ; 

 Bot. Mag. t. 325. J. scandens, Vahl, Symb. ii. 7. Leptostachya 

 virens, Nees in DC. Prod. xi. 378 ; Benth. in Hook. Niger Fl. 482. 

 P sender anthemum dichotomum, Lindau in Engl. Jahrb. xx. 40, and in 



