286 XCII. ACANTHACER. 
separating from the back and walls of the valves, curving up- 
wards with the seeds and seed-hooks.—DC. Prod. xi. p. 473. 
Herbs or shrubby plants, mostly tropical—s South African species, 
Eastern and from Natal. 
17. PERISTROPHE, Nees. 
Calyx 5-cleft or parted, equal, sessile in bracteated capitula. 
Corolla resupinate, 2-labiate, the lips flat, the upper 3-toothed, 
lower entire or 2-toothed. Stamens 2; anthers narrow, 2- 
celled, the cells placed obliquely one over the other, pointless. 
Capsules 2-valved, 2-celled, with a long sterile base, cells 2- 
seeded at the apex ; the septum adnate, persistent —DC. Prod. 
xi. p. 492. 
Herbs, with purple, long-tubed flowers, in axillary or terminal umbellate 
and 2-bracteate heads.—2 species, in the Eastern districts and Natal. 
18. HYPOESTES, R. Br. 
Calyx 5-cleft or parted, equal, included in a 4-leaved invo- 
lucre. Corolla 2-lipped, the lower lip deeply 3-fid. Stamens 
2; anthers 1-celled, cohering in the bud; cell lateral on a 
narrow connective. Stigma 2-fid. Capsule compressed and 
seedless at base, 2-celled and 4-seeded above ; septum adnate, 
complete. Seeds tubercled.—DC. Prod. xi. p. 501. 
Herbs or shrubs, Asiatic, Australian, and African, very abundant in 
Madagascar.—2 species, in the Eastern districts and Natal. 
19. RAMUSIA, Nees, not E. Mey. 
Calyx 5-parted, equal. Corolla 2-labiate, the tube long, the 
lips about equal, the upper entire, lower 3-fid. Stamens 2, in 
the throat, exserted; anthers 1-celled, glabrous, pointless, 
keeled at back, fixed above the base. Stigma entire. Capsule 
unknown.—D0C. Prod. xi. p. 309. 
An undershrub, with angularly bent, slender branches, oval, bluntly 
acuminate leaves, and terminal or axillary, spiked flowers. Bracts small. 
20. RHINACANTHUS, Nees. 
Calyx 5-parted, equal, subtended by small, subulate bracts 
and bracteoles. Corolla salver-shaped, 2-lipped, with a long, 
slender tube, the upper lip narrow, lower equally 3-fid. Sta- 
mens 2, exserted ; anthers 2-celled, pointless, placed one above 
the other on the connective. Capsule clavate, with a long, 
compressed, barren base, 4—2-seeded above; septum adnate, 
complete.—DC. Prod. xi. p. 442. 
R. oblongus, Nees, our only species, is an undershrub, found on the Chumi 
mountain by Eckler and Zeyher. Leaves lanceolate-oblong ; panicles 
axillary and terminal, 2-3-chotomous ; flowers tufted. 
