228 XCVIII. ACANTHACEH (CLARKE). [ Isoglossa. 
small, ellipsoid, compressed, 4-seeded ; stalk short (or not longer than 
the ellipsoid part), cylindric, solid; placente not rising elastically from 
the base of the valves ; seeds small, tubercular-scabrous, tubercles often 
elongate.—Herbs, with slender branches, sometimes 6 ft. high. Leaves 
ovate or elliptic, acuminate at either end, entire, petioled ; upper leaves 
often sessile, cordate. Inflorescence panicled, terminal and with axillary 
branches, pubescent, often glandular ; floral leaves and bracts usually 
narrow or small (but larger and enclosing the calyx in J. substrobilina 
and J. Gregorit). 
Species 25, in Africa and the Mascarene Islands, besides a few in India. 
By some inadvertence, Lindau, in Engl. & Prantl, Pflanzenfam. iv. 3 B. 342, 
separates Isoglossa from all other Justiciee by the character of 4 stamens; it never 
has more than 2. 
*Ev-Isoeiossa.—Anther-cells elliptic, one above the other. 
Most of the flowers pedicelled. 
Species of West Africa. 
Leaves very thin, nearly glabrate . . 1. L. glandulifera. 
Nerves of leaves strong, beneath scabrous . . 2. I. nervosa. 
Species of East Africa. 
Mature leaves glabrous or very nearly so. 
Corolla 3-3 in. long. 
Panicle hairy. 
Leaves up to 3 in, long 3. 1. laxa. 
Leaves up to 7 in, long 4, I. membranacea. 
Panicle glabrate 5. I. lactea, _ 
Corolla nearly 1 in. long . . . 6. I. Volkensi. 
Mature leaves pubescent, at least on the nerves. 
Bracts narrow. 
Panicle terminal. 
Leaves # in. long; corolla + in, long 7. I. parvifolia, 
Leaves 4 in. long; corolla 3 in. long . 8. LZ. somalensis 
Panicles numerous, terminal and axillary . 9&«< T, strigosula. ; 
Bracts ovate (small) . . . 10. I. mossambicensis. 
Flowers in small heads on the branches of a panicle. 
Leaves to the flower-clusters (or bracts) narrow, not 
enclosing the calyx, 
Sepals ;4,-+ in. long, subpetaloid, hairy . . . 11. ZT runssorica. 
Sepals 2 in. long, linear, green . . . 212. «0, oerstediana. 
Sepals + in. long, subulate in the upper half . . 13. LT. milanjienrs. 
Leaves to flower-clusters (or bracts) enclosing the 
calyx. 
Floral leaves distant, ovate, subacute . . . 14. 0, Gregori. 
Floral leaves imbricate, suborbicular . . . 15. I. substrobilina. 
**PsEUD-ADHATODA.—Anther-cells oblong, parallel, at 
nearly equal height, 
Corolla-lips as long as the tube. . 
Panicle-branches few ; corolla 1 in, long . . 16. I. grandiflora. 
Panicle-branches very many ; corolla 2 in, long . 17. I. floribunda. 
Corolla-lips much shorter than the tube. 
Hairs on panicle, and sepal tipped with red glands . 18. I. rubescens. 
Hairs on sepais long, white, without red glands . 18, I. ixodes. 
