224 XCVIII. ACANTHACEE (CLARKE). [ Adhatoda. 
bracts and bracteoles small. Calyx 3}; in. long. Corolla-tube 35 in. 
long; lobes } 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 ; anthers 2, one somewhat below the other, at the base 
acute, not tailed, or in &. suwbcaudatus 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; placente 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. R. communis. 
Lower leaves rounded or subcordate at the base . 2, R. rotundifolius. 
Leaves in the opposite pairs unequal in length . . 8. RB. subcaudatus. 
1. R. communis, Nees in Wall. Pl. As. Rar. 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 ? in. long, linear to the top ; 
lips } 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. Soe. vii. 51; C. B. Clarke in Hook. f. Fl. Brit. 
Ind. iv. 541; 8. Moore in Journ. Bot. 1880, 342; Oliv. in Trans. Linn. 
Soe. ser, 2, Bot. ii. 8346; Lindau in Engl. Jahrb. xviii. 63, t. 2 fig. 68. 
k. gracilis, Klotzsch in Peters, Reise Mossamb. Bot. 218; Lindau in 
Engl. & Prantl, Pflanzenfam. iv. 3 B. 339, and in Engl. Pf. Ost-Afr. C. 
371. 2. 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. 
Pseuderanthemum dichotomum, Lindau in Engl. Jahrb. xx. 40, and in 
