XCVIII. ACANTHACE^ (bURKILL AND CLARKE ). 



Valves of the placenta rising elasticaily from the base of 

 the ripe capsule so aa to throw out the seeds. 

 Floralleaf containing 3-1 ebvacteatfi ebracteolate flowers 23. Phavlops's. 

 Each flower with 2 large ovate or elliptic bracteoles . 24. Pktamdium. 



Tribe IV. Acantbeae. — Corolla \-lipped ; tvhe ahort. Stame.nfi -l; anthert 

 1-ceUed; pollen ellipsoid or suhglohose, tuith longitudinal baiuh. Oininj with 2-1 

 ovules in each cell. 



Caljx 4-partite to the base. Posticous lip of corolla want- 

 ing:. 



Blei'itaris. 

 Acanthus. 



Seeds hygroscopically hairy . . . . .2.5. 



Seeds without hairs . . . . . . .26. 



Calyx 5-partite to the base. Corolla limb split down the 



posticous face, so that the lip has 5 lobes all on one 



side. 

 Sepals all similar, postirona 1 -nerved . . . .27. Sclerocmiton. 

 Posticous sepal larger, 2-nerved, often 2-toothed at the 



t,p 



28. Cross AN DRA. 



Tribe V. Justldeee.— Corolla-Umh suhequalh/ b-lohed or 2-lippeA, one lobe 

 whoVy within, one wholly tvitJujut in the bud. Ovules 2-1 in each cell {except in 

 Crabbea). Seeds witJiout hygroscojnc hairs. 



Subtribei. Tetrandr^. — Stamens 4, all fertile; anther- 

 cells rounded at the base. 

 Ovules 3 or more in each cell. Corolla 2-lipped ; anther- 

 cells 2 ......... 29. Crabbea. 



Ovules 2-1 in each cell. 



Corolla distinctly 2-lipped. Pollen short ellipsoid, longi- 

 tudinally marked. 

 Calyx 5-fid. 



Racemes elongated, many-flowered 

 Spikes short, sometimes unilateral, bracteate 

 Calyx 4-fid. Flowers scattered subsolitary 

 Corolla not distinctly 2-Hpped. 



Corolla inflated upwards, mouth oblique ; posticous 

 stamens with 2-ce11ed anthers. 

 Anther-cells at equal height .... 



One anther-cell below the other, smaller 

 Corolla-mouth funnel-shaped, hardly oblique ; posti- 

 cous stamens with 1-celled anthers . . .35. Neuracanthus. 



33. 

 34. 



Thomandersia. 

 Lepidagathis. 



LiNDAUEA. 



ASYSTASIA. 

 FiLETIA. 



Subtribe ii. BarleriejE. — Stamens 2 fertile, 2 small rudi- 

 mentary often added. Calyx large, 4-partite to the 

 base, i.e., 2 anticous lobes connate nearly or quite to 

 the tip. Anther-cells 2, rounded at base ; pollen 

 globose, reticulated 



Subtribe iii. Eranthemeje. — Stamens 2. Corolla-tube long, 

 linear ; limb subequally 5-fid, spreading. Anther- 

 cells roimded at l»ase ; pollen subglobose, slenderly 

 marked longitudinally. 

 Anther-cells 2, at equal height ..... 

 Anther-cell 1 ........ 



Rubtribe iv. Eu.iusTiciEiE. — Stamens 2. Corolla dis- 

 tinctly 2-lipped. Calyx small or slender, or enclosed 

 by bracts or bracteoles, 5-fid (except in a few species 

 of .Tusticia). Seeds tubercular or smooth, without 

 needle-like hygroscopic hairs, rarely with stiff or minute 

 scabrous hairs. 



36. Barleria. 



37. 



38. 



Erantiiemum. 



RusroLiA. 



