28 XCVIII. ACANTHACEZ (BURKILL). [Elytraria, 
Bot. 197; T. Anders. in Journ. Linn. Soc. vii. 20; Nees in DC. Prod. 
xi. 63; S. Moore in Journ. Bot. 1880, 196. #. marginata, Vahl, 
Enum. i. 108; Beauv. Fl. Owar. ii. 58, t. 93; Nees l.c.; Hook. Niger 
Flora, 477; Henriques in Bolet. Soc. Brot. x. 146. #. lyrata, Vahl, 
Enum. i. 106. Justicia acaulis, Linn. f. Suppl. 84. Zubiflora acaulis, 
O. Kze. Rev. Gen. Pl. 500; Lindau in Engl. Pfl. Ost-Afr. C. 365. 
T. squamosa, Lindau (partly) in Engl. & Prantl, Pflanzenfam, 
iv. 3B. 289; Durand & Wildeman in Comptes-rendus Soc. bot. Belg. 
xxxvi. 82; Biittner in Mitth. Deutsch. Schutzgeb. vi. 234. 
Upper Guinea. Togoland, Biittner, 173. Lagos: Otto, common in forest- 
paths, Millen, 24! Oware and Benin, Beauvois. Lower Niger: Onitsa, Barter, 1302! 
Niger Delta: Grand Bassa, Vogel, 93! Cameroons: Batanga, Bates, 190! Fernando 
Po, Vogel, 15! Mann, 26! 
Wile Land. British East Africa: Niamniam ; by the River Yuru, Schweinfurth, 
ser. iii. 225! 
Lower Guinea. Island of St. Thomas, Don! Moller (ex Henriques). Gaboon 
River. Mann, 1002! Angola: Golungo Alto; Cungulungulo, Welwitsch, 5209! 
Quibolo Rivulet, Welwitsch, 5210; and without precise locality, Curror ! 
Mozamb. Dist. Portuguese East Africa: Lower Zambesi; at Tete, Lupata and 
Sena, Kirk / 
A form of the plant with entire acuminate leaves, which taper gradually into the 
obvious petiole and perhaps have more hairs on the upper surface than usual, occurs 
throughout the Great Western forest region from Lagos (and perhaps also Togolan4) 
to the Gaboon River, and westward to Niamniam Land. It has been mistaken for the 
American £. tridentata, Vahl, which differs in having obviously keeled narrow sterile 
bracts, those of HE. crenata being scarcely, or not at all, keeled and ovate. The form, 
common in India, with spathulate almost sessile crenate leaves, occurs on the Zambesi. 
Intermediate forms so unite these two extremes, both in Africa and India, that they 
cannot be held distinct. 
4, NELSONIA, R. Br.; Benth. et Hook. f. Gen. Pl. ii. 1073. 
Sepals 4, unequal, lanceolate, the larger often bifid. Corolla very 
small; purplish, rose or white; tube slender; limb 2-lipped; lobes 5, 
obtuse, patent. Stamens 2, attached above the middle of the tube; 
anthers 2-celled; their lobes broadly ellipsoid, distinct, more or less 
divergent, glabrous or ciliate, muticous or minutely spurred. Stigma 
very shortly 2-lipped ; ovules in each cell 8-10. Capsule oblong, acute, 
bearing seeds from the base, barren upwards. Seeds small, roundly 
ellipsoid, papillose, attached on minute points without retinacula. A 
diffuse, softly villous herb. Leaves opposite, elliptic, entire. Spikes 
ovate or cylindric; bracts ovate, glandular-villous, closely imbricate ; 
bracteoles 0). 
A single species, widely diffused through the tropics of both hemispheres, but 
probably introduced into America. 
1, N. campestris, &. Br. Prod. 481. Stems short; branches 
diffuse, decumbent, pubescent or villous. Lower leaves large and long 
petioled ; upper shortly petiolate or subsessile, much smaller, some- 
times under 4 in. long, pubescent or canescent. Spikes villous, 
1-3 in. long. Bracts broadly ovate, 2-3 lin. long. Calyx 14-2 in. 
