286 LXXXV. ASCLEPIADEiE (bROWN). 



never connate into a tube, sometimes having 

 5 minute teeth (which are often concealed 

 under the anther- wings,) alternating with 

 them at their base. 

 Coronal-lobes opposite to the corolla-lobes and 



connivent in a cup 29. Peosopostelma 



(and Cynanchum 

 schist oglossum). 

 Coronal -lobes alternating with the corolla- 

 lobes and opposite to the anthers, free to 

 their base or partly or entirely adnate to 

 tlie staminal-column. 

 Stem twining. 



Corolla saucer-shaped, not lobed to more 



than half-way down; coronal lobes 



erect, lanceolate-attenuate, gibbous 



at the base . . . . . 25. Oxystelma. 



Corolla not saucer-shaped, lobed to much 



more than half-way down. 



Coronal-lobes dorsally flattened, usually 



thin, with or without keels, 



thickenings or appendages on their 



inner face 30. Cynanchum. 



Coronal-lobes laterally flattened, ad- 

 nate to the backs of the anthers, 

 with free tips .... 24. Pentatropis. 

 Coronal-lobes obconic, trumpet- or 

 slipper-shaped, truncate or rounded 

 at the apex, with a short inflexed 

 horn on the inner side . .23. Pentaehinum. 



Stem not twining. 



Flowers in racemes, small corymbs, or 

 densely spirally arranged around 

 the terminal part of the peduncle, 

 which elongates as the flowers 

 successively develop. 

 Coronal-lobes dorsally flattened, thin . 30. Cynanchtjm. 

 Coronal-lobes not dorsally flattened, 

 thick and fleshy, beaked or bifid 

 at the apex . . . .17. Kanahia. 

 Flowers strictly umbellate, all arising 

 from the same point. 

 Coronal-lobes laterally flattened, with 



an upcurved spur at the base. . 16. Caloteopis. 

 Coronal-lobes not spurred at the base. 

 Coronal-lobes usually long, spreading 

 at the base then incurved over 

 the staminal-column, often 

 dilated at the apical part, flat, 

 with or without a pair of con- 

 tiguous erect flat lobes or keels 

 on the basal part, sometimes 

 reduced to the basal part with 

 its contiguous lobes, without 

 the terminal part, but then 



