1l4 XCVIII. ACANTHACEE (CLARKE). [ Crossandra. 
narrowly obovate, obtuse; base tapering; petiole 0. Spike 3 in. long, 
sessile, very dense; bracts 4 in. long, subrhomboidal, spinous-ciliate on 
the margins upwards, white hairy; bracteoles rather less than } in. 
long, linear. Calyx-segments 5; posticous % in. long, lanceolate, 
2-nerved, ending in 2 lanceolate hairy subspinescent points. Corolla 
yellow; tube more than } in. long, linear, altogether of Crossandra, but 
very slender. Anthers included in the corolla-tube, 1-celled ; pollen 
twice as long as broad.—Selerochiton stenostachyus, Lindau in Engl. 
Jahrb, xx. 27, and in Engl. & Prantl, Pflanzenfam. iv. 3 B. 316, and in 
Engl. Pfl. Ost-Afr. C. 369. 
Nile Land. British East Africa: Ukamba, Hildebrandt, 2720! 
The pollen as described by Lindau will not do for Sclerochiton. 
4. C. tridentata, Lindau in Engl. Pf. Ost-Afr. C. 370. Glabrous; 
innovations minutely pubescent. Stems 6 in. high. Leaves up to 
6 by 1} in., narrowly elliptic, tapering at both ends, tip obtuse ; petiole 
3 in. long or 0. Spike peduncled, ovoid, 14 in. long; bract % in. long, 
herbaceous, very sparsely hairy, ovate, tip lanceolate mucronate with 
sometimes a small mucro on each side; bracteoles lanceolate-linear, 
longer than the calyx. Posticous calyx-segment nearly } in. long; 
broadly ovate, 2-nerved, tip with 2 subglabrous mucronate teeth. 
Corolla-tube % in. long. Anthers subglabrous; pollen oblong- ellipsoid, 
3-ribbed. Style thinly hairy —Lindau in Engl. Jahrb. xxiv. 320. 
Mozamb. Dist. German East Africa: Kilimanjaro; above Useri, 6500 ft. 
Volkens, 1994! 
5. C. pungens, Lindau in Engl. Jahrb. xx. 36. Pubescent. Stem 
6-12 in. high. Leaves up to 7 by 14 in., narrowly elliptic, long-taperIng 
and coarsely undulate at the base. Spikes 2-6 by ?in., extremely dense ; 
bract # in. long, or rather more, broadly ovate, hairy, tip definitely 
spinous, margin hairyand scarcely spinous; bracteoles hardly } the length 
of the calyx, broadly lanceolate. Posticous calyx-segment 1 in. long, 
broadly ovate, 2-nerved; its tip emarginate, hairy, hardly toothed. 
Corolla-tube nearly 1 in. long; lobes 3 in. long, appearing to have been 
pale red. Anthers slightly hairy; pollen oblong, 3-ribbed. Style 
glabrous.—Lindau in Engl. Pfl. Ost-Afr. C. 370. 
Wile Land. British East Africa: Ribe, near Mombasa, Wakefield ! Nyika 
country near Mombasa, Wakefield ! 
Mozamb. Dist. German East Africa: Usambara; Magila, Kirk ! Tanga, 
Heinsen, 136! Duga, 300 ft., Holst, 3215! 
6. C. spinosa, Beck in Paulitschke, Harar, 459, Jigs. 13, 14. White 
hairy. Stems 1-3 in. long. Leaves 1 by } in., oblong-elliptic, obtuse, 
narrowed into a petiole } in. long, densely and shortly hairy. Spikes 
1 by ? in., with many long white hairs ; bract 2 in. long, herbaceous; 
ovate-lanceolate, hairy, spine-tipped, margin not toothed ; bracteole 
linear, longer than the calyx. Posticous calyx-segment 4 in. long; 
elliptic, 2-nerved, tip of 2 spinous hairy teeth. Corolla yellow; tube 
