340 



XCVI. ACAXTHACE.i;, 



Ovules many in eacb cell. 



Ovules superposed in 2 rows in eacb cell ; corolla- 

 lobes imbricate ; leaves not pinnately divided. 

 Calyx 4-partite ; stamens 2. 



Bracts rigid ; peduncle of spike covered with 



alternate scales 3. Tubiflora. 



Bracts herbaceous ; spikes sessile or, if pedun- 

 culate, the peduncle without scales 4. Nelsonia. 



Calyx 5-partite ; stamens 4 5. Staukogyne. 



Ovules not in 2 rows in each cell ; corolla-lobes 

 contorted, twisted to the left in bud ; lower leaves 



pinnately divided 6. Cardantheka. 



Seeds supported on hard upward-curved retinacula. 



Corolla without an upper lip ; lower lip large, expanded, 

 3-lobed ; ovules 2 in each cell. 



Lower filaments with an excur rent process 7. BLEPnAKis. 



Lower filaments without an excurrent process 8. Acanthus. 



Corolla 2-lipped or with i) subequal lobes. 

 Corolla-lobes twisted to the left in bud. 



Ovules more than 2 in each cell ; capsule normally 

 with 6 or more seeds. 

 Corolla distinctly 2-lipped. 



Inflorescence spinous 9. Astekacantha, 



Inflorescence not spinous 10. Hvgroi'hila. 



Corolla subequally 5-lubed. 



Bracteoles large, usually exceeding the 



calyx; capsule with a solid base 11. Euei.lia. 



Bracteoles small, narrow ; cajjsule seed- 

 bearing throughout 12. HEMioKAriiis. 



Ovules 2 in each cell ; capsule with 4 or fewer 

 seeds. 

 Placentas separating elastically from the base 

 of the ripe capsule ; stamens 4. 

 Bracteoles very large, reticulately nerved . 13. Petalidium. 



Bracteoles 14. Micrantuus. 



Placentas not separating elastically from the 

 base of the ripe capsule. 

 Anthers minutely mucronate or spurred 



at the base ; stamens 4 15. Dyschoriste. 



Anthers not spurred at the base. 

 Corolla subequally o-lobed. 



Corolla-tube long, linear, slender ; 



stamens 2 16. D.edalacanthus. 



Corolla-tube narrow below, usually 

 infundibuliform upwards ; sta- 

 mens 4 (except in S. rcticulatus). 17. Strobilantiibs, 

 Corolla deeply 2-lipped ; stauiens 4 ... 18. Calacantiius. 

 Corolla-lobes imbricate in bud. 



Ovules 3-10 in each cell ; capsule normally 

 ()- or more-seeded. 

 Capsule compressed at right angles to the 

 septum ; seeds ovoid, hardly compressed. 

 I'lowers in panicled often unilateral 



racemes, without axillary cladodea 19. Andrographis. 



Flowers clustered in the midst of axillary 



cladodes 20. HATLANTnus. 



Capsule subtercte ; seeds much compressed ... 21. GyMNOSTACHVUM. 

 Ovules 2 or rarely 1 in each cell. 

 Corolla-lobes 5, subequal. 

 Anthers 1 -celled. 



Sstamens 4, didynamons ; calyx T)- 

 partite, the 2 inner sepals smaller 

 than the outer 22. Crossanur.i. 



