XCII. ACANTHACE^. 281 



13. DUVEENOIA. 



14. JUSTICIA. 



Upper lip of corolla concave, compressed, 

 helmet-shaped ; lower flat ; stamens ex- 

 serted ; anthers 2-celled, obtuse .... 

 Upper lip of corolla concave, not helmet- 

 shaped ; lower convex, rugose ; anthers 2- 



celled, the lower coll spurred 



Upper lip of corolla narrow, 2 -dentate ; lower 

 convex, reticulate ; anthers 2-celled, cells 

 obtuse, subtransversely inserted one above 



the other obliquely 15. Ecteinanthus. 



Corolla-tube long, straight or resupinate ; lower 

 lip witli the medial lobe very large, the 

 lateral linear ; bracts (except in Rhinacan- 

 thus) much larger than the calyx. 

 Tube of corolla resupinate. 



Capsules short, the septum in the ripe fruit 



breaking off from the valves 16. Dicliptera. 



Capsules long, the septum persistent . . . 17. Peeistrophe. 

 Tube of corolla straight. 

 Antliers 2-celled. 



Calyx -lobes cohering ; bracts large, 4- 



leaved ; flowers in heads 18. Hypoestes. 



Calyx 5-parted ; corolla with a very long 

 tube ; bracts small, subulate ; flowers 



panicled 20. Rhinacanthus. 



Anthers 1 -celled, stamens included ; flowers 



not spiked 19. Ramusia. 



Corolla-tube short, dilated ; lower lip subequally 



3-lobed ; stamens 2 or 4 ; bracts small or 0. 



Anthers 1-celled, blunt ; flowers spiked . . 21. RuTTYA. 



4. AsYSTASiE^. Corolla funnel- or salver-shaped, 



with 2-labiate aestivation. Stamens 4, 2 often 



sterile. 



Stamens 4, all fertile ; anther-cells mucronate at 



base 22. Asystasia. 



Stamens 4, 2 sterile ; anther-cells obtuse . . .23. Mackaya. 



SuBOEDER 1. Thunbergideae. (Gen. 1.) 

 1. THUNBERGIA, Linn. f. 



Calyx minute, cup-like, truncate or many-toothed, concealed 

 under 2 large, leafy, valvate bracts. Corolla between bell- 

 and funnel-sliaped, inflated in the throat, the limb subequally 

 5-lobed, spreading. Stamens 4, didynamous ; anthers erect, 

 adnate, the cells parallel, mucronate at base. Stigma funnel- 

 shaped, sub-2-labiate. Disk thick, circling the ovary. Cap- 

 sule swollen at base, 2-celled, 2-4-seeded, tapering into a beak. 

 Seeds subtended by a cup-like ring. — DG. Prod. x\. p. 54. 



Climbing or prostrate shrubs or herbs, Asiatic and African. Leaves 

 mostly angular, often liairy. Flowers axillary, peduncled, solitary or race- 

 mose, handsome, yellow blue or wliite, the throat often darker. — 5 South 

 African species,native3 of the Eastern districts and Natal. 



