104. ACANTHACE^. 



B. Corolla-limb 2-lipped or lobes 5 subequal. Lobes im- 

 bricate in bud (Nos. 16-32) :— 

 1. Ovules 2 in each cell (Nos. 16-30) :— 



a. Corolla not distinctly 2-lipped (posterior lobes 



sometimes somewhat smaller than anterior or 

 more connate : — 

 i. Bracteoles very large, far exceeding the calyx. 



Calj'x-segments 4 16. Barleria. 



ii. Bracteoles linear or very small. Calyx-seg- 

 ments 5 : — 

 + Stamens didynamous, anthers 1- or2-celled : — 

 Spikes often lax, bracts shorter than calyx. 



Anthers 2-celled 17. Asystasia. 



Spikes with imbricating bracts exceeding 

 calyx. Anths. 1-celled . . . .18. Crossandra. 



+f Stamens 2, staminodes often 2. Flowers 



spiked 19. Eranthemum. 



b. Corolla distinctly 2-lipped : — 



i. Stamens didjmamous. Bracts often 4-farious: — 

 t Anterior anthers 2-celled, posterior 1- 

 celled:— 

 Calyx sub-2-lipped, posterior lip 3-toothed, 



anterior 2-lobed 20. Neuracanthus. 



Calyx subequally 5-fid 21. Lepidagathis 



purpuricaulis. 

 tt Anthers all 2-celled (exc. L. purpuricaulis) 21. Lepidagathis. 



ttt Anthers all 1-celled 22. Aphelandra. 



ii. Stamens 2. Anthers 2-celled : — 



f Flowers in spikes or thyrses, rarely 



{Jacohinia spji.) clustered. Bracts of ten 



4-farious : — 



! Bracts membranous or hyaline 2- or 4- 



ranked in secund spikes, if 4-ranked 



dimorphous :— 



Diffuse herbs. Lower anther-cell tailed 



or muticous 23. Eungia. 



!! Bracts in cylindric or 4-farious spikes 

 (exc. Jacobinia), homomorphous : — 

 * Anther- cells superposed: — 

 Shriibs or herbs, Fls, small or m,s. 



Lower anth.-cell white-tailed , , 24. Justicia. 

 Shrubs. Flowers large, corolla-tube 

 short and broad. Lower anth.-cell 

 obscurely mucronate . . .25. Adhatoda. 



** Anther-cells parallel sub-equal or one 

 only slightly higher: — 

 § Cor.-tube slender. Staminodes 0: — 

 Shrubs or robust herbs. Fls. usually 

 red, often clustered or in dense 



cymes or thyrses .... JacoJuna, p. 694. 

 Dwarf herb with prettily veined 



leaves. Fls. spicate, yellow . Fittonia, p. 695. 

 Uiidershrub. Flowers pale blue in 



dense bracteate spikes . . .26. Ecbolium. 

 §§ Cor.-tube widened upwards, stami- 

 nodes small :— 

 Shrub with variegated leaves. Fls. 



in thyrses 27. Orapfophyllum. 



tt Flowers in 1-few-fld. cymules. Cy mules 



on the branches of a diffuse panicle or, 



if clustered axillary, enclosed between a 



pair of disparous bracts : — 



Cymules minute panicled, bracts minute. 



Fls. white 28. Skinaeanthus. 



Cymules panicled or axillary, bracts ex- 

 ceeding calj'x, Fls. rose or purple . . 29. Periftrophe. 



664 



