236 XCVIII. ACANTHACEH (CLARKE). [Hcbolium. 
deeply 3-lobed ; posticous lip subentire. Stamens 2, without rudiments 
of others ; anther-cells 2, linear, muticous, nearly at equal height ; pollen 
globose, with 3 meridional lines or bands and stopples. Ovary glabrous 
or hairy ; ovules 2 in each cell; style branches 2, subequal, very small. 
Capsule ovoid, much flattened, 2-seeded, on a solid stalk ; placenté not 
rising elastically from the base of the valves; seeds in Hu-Hebolium 
rather large, much flattened, tubercular scabrous, without hairs, but in 
Choananthus often without tubercles, smooth or papillose or with 
minute hairs.—Shrubs, glabrous or hairy. Leaves entire, rather thick. 
Spikes terminal, many-flowered ; bracts large, ovate or obovate, imbri- 
cate, enclosing the small calyx (in the Tropical African species) ; 
bracteoles linear, a little longer than the calyx. 
Species 12; in Africa, Madagascar, Arabia and India. 
Kurz grounded his genus Ecbolium mainly on the shape of the corolla, which 
approaches that of Rhinacanthus. The subgenus Choananthus here added might, 
almost equally well, be attached to Megalochlamys. 
*Evu-EcBoLiuM.—Corolla-tube long, linear ; posticous lip 
narrowed from an ovate base to a linear tip. 
Bracts longer than the calyx. 
Petiole short ; leaves tapering into the petiole . . 1. ZB. linneanum. 
Petiole 0. 
Leaves glabrous, hastate, amplexicaul . . . 2 #. amplexicaule. 
Leaves hairy. 
Leaves narrow at the base, auricled . 3. E. auriculatum, 
Leaves broad at the base, subcordate 4. E, subcordatum. 
Bracts rather shorter than the calyx 5. E. parvibracteatum. 
*CHOANANTHUS,—Corolla-tube narrowly funnel-shaped or 
cylindric ; posticous lip oblong, 
Bracts not 3-nerved. 
Petiole }-3 in. long . . . : 6. EF. striatum. 
Petiole rarely attaining 4 in., usually very short. 
Seeds tubercular-scabrous, without hairs . . 7. E, barlerioides. 
Seeds smooth, without tubercles. 
Seeds shining, without hairs. . . . 8. E, Anisacanthus. 
Seeds with scattered glochidiate hairs . . 9. E, revolutum. 
Seeds shining, with very minute hairs . . 10, #. hamatum. 
Bracts distinctly 3-nerved . . . . . 11. E. trinervium. 
1. E. linneanum, Kurz in Journ. As. Soc. Beng. x1. part 2 (1871), 
75. Leaves often 3 by 4 in., tip triangular, obtuse, base narrowed, 
glabrous or obscurely puberulous ; petiole 0—} in. long; leaves vary!08 
from narrowly oblong to broadly ovate, also much in size. Spikes 
often 4 by 1 in., strobilate; bract } by 2 in., ovate, apiculate, often 
pubescent, entire or nearly so in the African examples, often strongly 
toothed in the Indian; bracteoles 4 in. long, linear, hairy. Calyx 
$ in. long. Corolla-tube ?—1 in. long, linear to the top; lobes of anti- 
cous lip 3, }-} in. long, elliptic; posticous lip 4-} by yin. upwards, 
notched at the tip. Pollen globose ; meridional smooth depressions ba 
narrow, not reaching the poles. Ovary glabrous; style-base hairy. Capsu'e 
whole length 3} in.; stalk linear-cylindric; head compressed, $ in. In 
