434 200. APOCYNACEAE 



Scales at the throat of the corolla free or slightly united at the base. Corolla- 

 segments nearly always overlapping to the right. Ovary almost superior 

 or half-inferior ii 



11. Corolla salver-shaped with 5 entire scales at the throat. Calyx without 



glands, rarely with 5 small glands within. Filaments inserted on the 

 lower part of the corolla-tube. Disc cup-shaped, 5-lobed or 5-parted. 

 Twining shrubs. Leaves opposite, without axillary glands. Flowers 

 small. — Species 12. Tropical and South-east Africa. Oncinotis Benth. 

 Corolla funnel-shaped, with 5 divided scales at the throat. Calyx with 

 usually numerous glands within. Disc none 12 



12. Corolla with laciniate scales at the throat, and with broad, not tailed seg- 



ments, white or red. Anthers with a tailed connective. Mericarps at 

 first cohering, subsequently divergent. Seeds with an apical tuft of 

 hairs. Erect shrubs or low trees. Leaves whorled, narrow, densely 

 veined. Flowers large. — Species i {N. Oleander L.). North Africa. 

 A poisonous plant yielding wood and medicaments and used as an 



ornamental plant Nerium L. 



Corolla with bipartite scales at the throat, and with usually tailed segments. 

 Mericarps divaricate, ultimately spreading horizontally. Seeds with a 

 basal tuft of hairs and a long apical awn. Leaves usually opposite, 

 with axillary glands. — Species 35. Tropical and South Africa. Some 

 species yield vegetable silk, poisons, and medicaments, or serve as orna- 

 mental plants. (Including Roupellia Baill. and Zygonerion Baill.) 



Strophanthus P. DC. 



13. Corolla bell-, pitcher-, or funnel-shaped, usually small and with scales 



in the tube. Calyx-segments with 3 — 5 glands or without glands at the 



base. Twining shrubs 14 



Corolla salver-shaped and more or less constricted at the mouth, usually 

 large and without scales in the tube 18 



14. Calyx and corolla very large ; corolla white, with a glabrous tube, the 



segments short and overlapping to the right. Filaments thickened 

 above. Anthers acuminate. Disc cupular, lobed. Stigmatic head 

 conical. Leaves with distant nerves and axillary glands. Flowers in 

 terminal cymes. — Species i. Naturalized in Madagascar. 



Eeaumontia Wall. 



Calyx and corolla small or medium-sized ; in the latter case corolla-segments 



long. Leaves with distant nerves but without glands, or with closely 



set nerves and with axillary glands 15 



15. Corolla-segments overlapping to the left ; tube very short, with 10 longi- 



tudinal ridges. Anthers very shortly tailed. Disc none Ovules 4 in 

 each carpel. Leaves closely nerved, with small, axillaiy glands. — 

 Species 2. Equatorial West Africa. . . . Pycnobotrya Benth. 



Corolla-segments overlapping to the right. Disc cupular. Ovules numer- 

 ous in each carpel. Leaves remotely nerved, without axillary glands. 16 



