440 200. APOCYNACEAE 



51. Anthers linear, on short but distinct filaments. Axillary glands and 



stipules present. — Species 2, one a native of Madagascar, the other 

 naturalized in the tropics. Ornamental plants. (Under Tabernae- 



montana L.) Ervatamia Stapf 



Anthers oblong or ovate, sessile. Axillary glands and stipules absent. — 

 Species 2. West Africa. (Under Caypodinus R. Br. or Picralima 

 Pierre) Polyadoa Stapf 



52. (42.) Disc reduced to two glands alternating with the carpels. Ovules in 



two rows. Herbs or undershrubs. Flowers solitary, axillary, . . 53 

 Disc ring-shaped or wanting. Shrubs or trees 54 



53. Stamens inserted at the middle of the corolla-tube ; filament inflexed ; 



connective broadened, hairy. Stigmatic head with 5 tufts of hairs. 

 Corolla blue. — Species 2, one a native of North-west Africa, the other 

 naturalized there and in the Islands of St. Helena and Ascension. Used 

 as ornamental and medicinal plants. "Periwinkle." . . Vinca L. 

 Stamens inserted in the upper part of the corolla-tube ; filament very 

 short, oblong ; connective glabrous, not broadened. Stigmatic head 

 glabrous. Corolla white or pink. — Species 3 ; two natives of Madagascar, 

 the other one naturalized in Tropical and South Africa. They are used 

 as ornamental and medicinal plants. (Under Vinca L.) 



Lochnera Reichb. 



54. Disc distinct, wavy, adnate to the ovary. Corolla funnel-shaped. Stamens 



inserted below the middle of the corolla-tube. Anthers with long, 

 curved tails. Erect shrubs. Leaves opposite. — Species 2. East 



Africa Carvalhoa K. Schum. 



Disc obscure or absent. Corolla salver-shaped. Anthers with short 

 tails or without tails 55 



55. Ovary half-inferior. Style very short. Calyx-lobes broad. Stamens 



inserted in the lower part of the corolla-tube. Seeds winged. Leaves 

 alternate, exstipulate, without axillary glands. Erect shrubs or trees. 

 — Species 3. Cultivated and sometimes naturalized in the tropics. 

 They yield timber, perfumes, medicaments, and edible fruits, and serve 

 also as ornamental plants. {Plumeria Willd.) .... Plumiera L. 

 Ovary superior. Leaves opposite or whorled $6 



56. Corolla with a short ventricose tube and with 5 scales at the throat. Ovules 



in two rows. Mericarps keeled or winged, long cohering. Twining 

 shrubs. Leaves opposite. — Species 5. Madagascar. Some are 

 poisonous or yield rubber and medicaments. Plectaneia Thouars 

 Corolla with a long, cylindric tube slightly widened at the insertion of the 

 stamens, without scales, but sometimes with hairs or with a continuous 

 ring at the throat. Ovules usually in three or more rows 57 



57. Corolla with a tubercled ring at the throat. Stamens inserted in the upper 



part of the corolla-tube. Stigmatic head conical, with a membranous 



