XCYI. ACA^rTHACE.^. 



341 



Antbers 2-cellecl. 



Calyx 4-partite, the 2 opposite outer 

 sepals much larger than the inner; 



stamens 2 only perfect 23. BarleRia. 



Calyx 2-lipped, 5-lubed ; stamens 4 ... 24. Neukacanthi-s. 

 Calyx-segments 5, subequal, small. 

 Stamens 4 ; corolla-tube inflated 



above 25. Asystasia. 



Stamens 2 ; corolla-tube long, slen- 

 der 26. Eranthemum. 



Corolla distinctly 2-lipped. 



Stamens 4; anthers 2-celled 27. Lepidagathis. 



Stamens* 2. 



Anthers 1-celled ; bracts larger than 



the calyx-segments 28. Hyp(estes. 



Anthers 2-celled. 



Placentas separating elastically 

 from the valves from the base 

 upvpards. 



Bracts in unilateral spikes 29. Rungia. 



Bracts clustered in the leaf-axils 



or laxly cymose 30. Dicliptera. 



Placentas nut separating elastically 

 from the valves. 

 Anther-cells parallel, subequal ; 



bracts large, imbricate 31. Ecbolium, 



Anther-cells one higher up than 

 the other. 



Anther-cells (at least the 



lower) with a white basal 



spur-like appendage. 



Capsule usually 4-seed- 



ed; seeds rough or 



tuberculate 32. Justicia, 



Capsule 2-8eeded ; seeds 

 smooth, usually shin- 

 ing 33. MONECHMA. 



Anther-cells not spurred at 

 the base. 

 Anther-cells apiculate ... 34. Adiiatoda. 

 Anther-cells niuticous. 

 Bracts and bracteoles 

 small, subequal ; 



corolla white 35. Ehinacantiius. 



Bracts larger than the 

 bracteoles, in oppo- 

 site valvate pairs ; 

 corolla rose or pur- 

 ple 36. Peristropiie. 



1. THUNBERGIA, Linn. f. 

 Climbers. Leaves opposite, often cordate, hastate or angular. Flowers 

 axillary, solitary, or in pairs, or racemose ; bracts at the base of the 

 pedicels leaf-like ; bracteoles large, the margins cohering at least when 

 young. Calyx small, annular ; teeth 10-16 or obscure. Corolla con- 

 spicuous ; ttJbe swollen, curved ; limb oblique with rounded lobes twisted 

 to the left in bud. Stamens 4, didynamous, inserted near the base of 

 the corolla-tube; anthers 2-celled, the cells parallel, obhque, spurred or 

 not at the base; pollen globose, obscurely banded, smooth or most 



