368 A FLORA OF MANILA 



slenderly peduncled, about 1 cm long. Calyx green, the teeth linear- 

 lanceolate. Corolla white or very pale-pink, two lobes somewhat larger 

 than the other two. Capsule oblong, as long as the calyx. 



On ledges along streams, Masambong, etc., fl. Oct.-Mar.; widely dis- 

 tributed in the Philippines. Tropical Africa and Asia, through Malaya to 

 Australia. ' 



116. APOCYNACEAE (Alstonia oe Dita Family) 



Erect or twining vines, or trees, rarely undershrubs. Leaves opposite 

 or whorled, sometimes alternate, simple, entire. Flowers in terminal or 

 axillary cymes, perfect, regular. Calyx 5- rarely 4-lobed, often glandular 

 within. Corolla rotate or salver-shaped, the lobes 5, rarely 4, spreading, 

 imbricate and twisted in bud, rarely valvate, the throat sometimes append- 

 aged. Stamens 5, rarely 4, on the tube or throat of the corolla, included 

 or exserted, the • anthers conniving, often adhering to the stigma. Disk 

 various or none. Ovary 1-celIed, 2-celled, or of 2 free or more or less 

 united carpels, often united only by the styles; ovules few to many. Fruit 

 a dry or fleshy drupe or berry, or a dry or fleshy follicle, solitary or in 

 pairs and more or less united at the base. Seeds various, often winged or 

 with a terminal coma of long soft hairs. Juice milky. 



Genera 162, species about 1,300, in all tropical countries, few in temperate 

 regions, 32 genera and about 50 species in the Philippines. 



1. Anthers included or exserted, free from the stigma. 

 2. Leaves alternate. 



3. Leaves broad ; trees with nearly white flowers. 



,4. Ovules many in each cell 1. Plumiera 



4. Ovules 4 in each cell 2. Cerbera 



3. Leaves lincitr; shrubs with large yellow flowers 3. Thevetia 



2, Leaves opposite. 



3. Undershrubs with showy pink or white flowers, and small dry fol- 

 licles 4. Lochnera 



3. Shrubs with small or medium white flowers and red, more or less 

 fleshy, usually longitudinally ridged or keeled follicles. 



6. Tabemaemontana 

 2. Leaves whorled. 

 3. Trees with small white flowers and very long slender follicles. 



6. Alstonia 



3. Shrubs or vines with large yellow flowers 7. Allamanda 



1. Anthers surrounding and adnate to the stigma. 



2. Corolla-throat with 5 to 10 entire or fimbriate scales or appendages. 



3. Anthers exserted; trees 8. Wrightia 



3. Anthers included. 



4. Shrubs with narrow, densely nerved leaves, the corolla-lobes not 



elongated; cultivated only 9. Nerium 



4. Vines with broad leaves, the corolla-lobes produced into very long, 



pendulous tails 10. Strophcmthus 



2. Corolla-throat naked. 



3. Anthers exserted, their filaments spirally twisted .... 11. Parsonsia 

 8. Anthers included or half-exserted, their filaments not twisted. 



