282 XCII. ACANTHACEiE. 



Suborder 2. Ruellidese. (Grcn. 2-G.) 



2. CALOPHANES, Don. 

 Calyx very deeply 5-clet't, the segments setaceous. Corolla 

 funnel-shaped ; limb 5-fid, subregular. Stamens 4, didynamous, 

 or 2 ; anthers 2-spurred at base or pointless, cells parallel, 

 flat, membranous. Capsule lanceolate, 4-seeded in the middle. 

 DC. Prod. xi. p. 107. Also Ch^tacanthus, DC. I. c. 462 ; Li- 

 nostylis. Sand, in Linn, xxiii. p. 94. 



Herbs or rigid halfshrubs. Leaves small. Flowers opposite, axillary, 

 sessile, with 2 subulate briicts at base. — 5 South African species, natives of 

 Eastern district and Natal. 



3. RUELLIA, Linn. 



Calyx 5-parted, the segments equal or unequal, linear. 

 Corolla funnel-shaped, the tube subcampanulate upwards ; 

 limb bluntly 5-lobed, subequal. Stamens 4, didynamous, not 

 longer than the corolla ; anthers oblong, 2-celled, cells parallel, 

 equal, pointless or mucronate at base. Stigma subulate, with 

 a tooth at base, or 2-lamellate. Capsule tumid aboye, 6-8-16- 

 seeded.— i)a. Prod. xi. p. 143. Also Fabria, E. 31. ; DC. I. c, 

 p. 113. 



Herbs or underslirubs, pubescent or hairy. Flowers axillary, solitary, 

 spiked or capitate, with small bracts. — 4 South African species, Eastern. 



4. PETALIDIUM, N. ab E. 



Calyx equal, deeply 5-parted, enclosed in 2 large, yeiny, 

 yalyate, boat-shaped bracts. Corolla funnel-shaped, the limb 

 subequally 5-fid. Stamens 4, didynamous, included ; anthers 

 oblong, the cells parallel, mucronate at base. Stigma 2-fid, 

 the lobes linear. Capsule shortly compressed at base, 4-seeded 

 in the middle ; septum persistent. — Thes. Cap. t. 143. 



P. linifolium, T. Andr., the only South African species, is a rigid, gla- 

 brous, branching shrub, with narrow linear, acute leaves, and axillary, pe- 

 dunculate flowers, each sitting in a pair of boat-shaped, papery membra- 

 nous bracts, netted over with slender, green veins. — Found in Damaraland 

 by Mrs. Kolbe. 



5. PSEUDOBARLERIA, T. Anders. 



Bracts 2, opposite, large, covering the calyx and corolla in 

 bud, and the capsule. Calyx 4-parted, the upper and lower 

 segments larger, lateral smaller, subulate. Corolla funnel- 

 shaped ; tube constricted, longer than the equally 5-lobed 

 limb ; lobes short, with twisted {estivation. Stamens 4, in- 

 cluded ; filaments equal, inserted in the throat, connate in 

 pairs at base ; anthers 2-celled, sagittate, cells mucronate at 

 base. Stigma subulate, shortly 2-lobed at base, slightly revo- 



