280 XCII. ACANTHACEiE. 



have adopted the arrangement of Dr. T.Anderson, given in Pro- 

 ceedings of Linn. Soe., vol. vii., Bot., p. 13.) 



Suborder 1. Thunbergidese. Calyx reduced to a fleshy, entire or se- 

 veral-toothed ring. Lobes of corolla twisted in aestivation. Seeds sub- 

 tended by a cup-like process. — Climbing or prostrate, rarely erect plants. 



Calyx inconspicuous, hidden under 2 large, leafy 



bracts 1. Thfnbekgia. 



Suborder 2. Ruellideae. Calyx herbaceous, 5- rarely 4-parted. Corolla 

 with twisted sestivation. Seeds subtended by a rigid hooked process, or by 

 a small nipple. — Not climbers. 



Bracts minute or ; capsules subterete. 



Corolla straight ; anthers 2-spurred at base ; cap- 

 sules linear, acute, 4-seeded at apex .... 2. Calophanes. 

 Corolla straight or cm-ved ; anthers not spurred ; 



capsules tumid above, subglobose, many-seeded. 3. RUELLIA. 

 Bracts 2, large, covering the unopened corolla ; 

 capsules obovate, shortly constricted at base, 

 dorsally compressed. 

 Bracts membranous, veiny ; calyx 5-parted ; 



flowers solitary 4. Petaliditjm. 



Bracts subherbaceous ; calyx 4-parted ; flowers 



in lateral cy mules 5. Pseudobaeleeia. 



Bract solitary, large ; 2 short bracteoles ; calyx un- 

 equally 5-parted ; flowers in dense spikes ... 6. Phatlopsis. 



Suborder 3. Acanthidese. Calyx herbaceous, 5- rarely 4-parted. Co- 

 rolla with imbricate or imbricate-2-labiate aestivation. Seeds subtended by 

 a rigid, hooked process. 



1. Baeleeie^. Corolla salver-, funnel-, or bell- 



shaped, subequally 5-lobed ; lobes with imbri- 

 cate aestivation. 



Calyx 4-parted ; corolla funnel- or salver-shaped ; 



stamens 2-4 7. Baeleeia. 



Calyx 5-parted ; corolla bell-shaped ; stamens 4 ; 



ovules 4-8 8. Ceabbea. 



2. Acanthe^. Corolla 1-labiate, 3-5-lobed ; sta- 



mens 4 ; anthers 1-celled. 

 Calyx cruciately 4-parted. 

 Tube of corolla very short. 



Upper calyx-lobe entire, 3-nerved, lower 2- 



nerved; capsules with membranous-valves. 9. Blephaeis. 

 Upper calyx-lobe 4- or many-nerved ; cap- 

 sule papery 11. Acanthus. 



Tube of corolla long ; upper calyx-lobe obso- 



letely 6-nerved, lower 6-nerved 10. Acanthopsis. 



Calyx 5-parted, scarious, veinless ; corolla 5- 



lobed 12. Scleeochiton. 



3. JusTiciEiE. Corolla 2-lipped ; fertile stamens 



2 ; antlier-cells more or less superposed. 

 Corolla-tube short, straight ; lower hp 3-fid, the 

 medial lobe larger than tlie lateral; upper hp 

 shortly 2-dentate ; stamens 2. 



