Thunbergia. | ACANTHACEE (Clarke). 11 
somewhat truncate, toothed, petioled; flowers solitary, axillary ; 
anther-cells none spurred at the base ; style 2-lobed. 
KALAHARI REGION: Transvaal; Magaliesberg, ex Lindau. 
19. T. atriplicifolia (Lindau in Engl. Jahrb. xvii. Beibl. 41, 36, 
39, not of H. Mey.) ; leaves sessile, toothed, rounded at the base, 
thickly and softly hairy; flowers solitary, axillary ; anther-cells 
none spurred at the base; style 2-lobed. 
From the Cape to Port Natal, ex Lindau. 
20. T. aspera (Lindau in Engl. Jahrb. xvii. Beibl. 41, 36, 39, 
not of Nees) ; leaves sessile, toothed, truncate at the base, scabrous- 
hairy at least on the margins ; flowers solitary, axillary; anther-cells 
none spurred at the base; style 2-lobed. 
Eastern Reaion: Kaffraria, ex Lindau. 
Il. HYGROPHILA, R. Br. 
Bracts large, oblong ; bracteoles shorter than the calyx. Calyx 
deeply 5-fid, in the Cape species 4-fid. Corolla 2-lipped; lobes 5, 
contorted in the .bud.. Stamens 4; anther-cells muticous ; pollen 
ellipsoid, with longitudinal grooves. Ovules 3 or more in each cell. 
Capsule narrow-oblong, seed-bearing from the base; seeds usually 
very numerous, 2-8 only in the Cape species, with hygroscopic 
hairs. 
Leaves entire. 
Species 20, widely spread in the Tropics, 
The single South African species belongs to the section Asteracantha (often 
considered generically distinct), which has the flowers packed in large dense 
axillary clusters surrounded by strong spines. 
1, H. spinosa (T. Anders. in Thwaites, Enum. Pl. Zeyl, 225) ; 
stems 3-4 ft. long, stout, suberect, hispid; leaves 4-8 by 3-1 in., 
oblong, hispid, subsessile ; axillary inflorescences 1-2 in. in diam. ; 
spines 3—1+ in. long, stout ; bracts }—1 in. long, lanceolate ; bracteoles 
4-4 in. long, narrow ; calyx j—} in. long ; segments lanceolate ; corolla 
1 in. long, pale blue-purple; capsule 3—} in. long. T. Anders, in 
Journ. Linn. Soc. vii. 22; C, B. Clarke in Hook. f. Fl. Brit. Ind. iv. 
408; Burkill in Dyer, Fl. Trop. Afr. v. 31. Barleria longifolia, 
Linn. Amoen. Acad. iv.320. Asteracantha longifolia, Nees.in Wall. 
Pl. As. Rar. iii. 90, and in DC. Prod. xi. 247; Wight, Ic. t. 449; 
Lindau in Engl. Pfl. Ost-Afr. C. 367. 
Katawari Reaion: Transvaal; between Spitz Kop and Komati River, Wilms, 
1203! : 
Eastern RuGion : Delagoa Bay, on the Umkomaas River, 50 ft,, Sanderson, 
575! 
Abundant in Tropical Africa and India. 
III, RUELLIA, Linn. 
Bracteoles 2, oblong or spathulate-elliptic. Calyx shorter than the 
bracteoles (or in R, Zeyheri scarcely longer), regular or 2-lipped in 
