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 OR 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-celled, 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. 
8. Leaves broad; trees with nearly white flowers. 
A; Vile? niaty ia exch colt t. ee ee ere 1. Plumiera 
a yales en enth colts =? 1 0 oe eee 2. Cerbera 
8. Leaves linear; shrubs with large yellow flowers ................ 3. Thevetia 
2. Leaves opposite. 
8. Undershrubs with showy pink or white flowers, and small dry fol- 
|e ci a Le Aili lake LS SRO Pa LS ano M le 0) aki AT A 4. Lochnera 
3. Shrubs with small or medium white flowers and red, more or less 
fleshy, usually longitudinally ridged or keeled follicles. 
5. Tabernaemontana 
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. 
De PRTPGIUOT ES CPR EIOT CN CTE once ne cee ees 8. Wrightia 
3. Anthers included. 
4, Shrubs with narrow, densely nerved leaves, the corolla-lobes not 
élongated ; cultivated: only ‘-s2-....-__..2- 9. Nerium 
4. Vines with broad leaves, the corolla-lobes produced into very long, 
pendmlous: tals... 209 foto ine ea 10. Strophanthus 
2. Corolla-throat naked. 
3. Anthers exserted, their filaments spirally twisted .... 11. Parsonsia 
3. Anthers included or half-exserted, their filaments not twisted. 
