382 A FLORA OP MANILA 



Genera 44, species about 1,000, in all parts of the world, but more 

 abundant in tropical and subtropical regions, 17 genera and about 50 species 

 in the Philippines. 



1. Styles 2, free, each 2-branched; slender hairy herbs with subrotate 



flowers - !• Evolvulua 



1. Styles united, the stigmas 1 or 2; flowers campanulate, salver-shaped 

 or urn-shaped. 

 2. Corolla urn-shaped, the flowers in dense, axillary, subcapitate cymes. 



2. Lepistemon 

 2. Corolla salver-shaped. 



3. Flowers small, bright-red, the limb narrow 3. QuamocUt 



3. Flowers very large, white, the limb broad..". 4. Calonyction 



2. Corolla campanulate or funnel-shaped. 



3. Sepals much enlarged in fruit, often fleshy, quite enclosing the 

 capsule. 

 4. Stems 4-winged or flowers yellow; capsule dehiscent.. 5. Operculina 



4. Stems terete; capsule indehiscent 6. Stictocardia 



3. Sepals not or but slightly enlarged in fruit. 

 4. Fruit indehiscent. 



5. Leaves densely silky-pubescent beneath, with white, shining 



hairs 7. Argyreia 



5. Leaves glabrous or pubescent, not white-silky-hairy.... 8. Rivea 

 4. Fruit dehiscent or the walls fragile and soon breaking up. 



5. Ovary 1-celled 9. Hewittia 



5. Ovary 2- to 4-celled. 

 6. Corolla-tube with 5 vertical bands of 5 parallel lines each. 



10. Merremia 

 6. Corolla-tube with 5 vertical bands of 2 lines each.. 11. Ipomoea 



1. EVOLVULUS Linnaeus 



Slender, spreading herbs with small, entire leaves. Flowers small, axil- 

 lary, solitary, or 2 or 3 on each peduncle. ' Sepals unequal. Corolla funnel- 

 shaped, the limb 5^parted. Stamens included or exserted. Ovary 2- or 

 1-celled, 4-ovuled; styles 2, separate from the base, each cleft into 2 

 stigmas. Capsules globose, 4- or 2-valved, usually 4-seeded. 



Species about 70, in all tropical and subtropical regions, mostly in tropical 

 America, 1 in the Philippines. (Latin "to unroll," in reference to their non- 

 twining habit.) 



1. E. alsinoldes L. 



A very slender, more or less branched, spreading or ascending, usually 

 very hairy herb, the stems 20 to 70 cpi long, not twining. Leaves variable, 

 hary, 0.5 to cm long, ovate elliptic, or oblong. Peduncles slender, longer 

 than the leaves. Flowers pale-blue. or nearly white, 6 to 8 mm in diameter. 



In open dry grass lands near Fort McKinley, La Loma, etc., fl. Sept.-Feb.; 

 widely distributed and possibly introduced in the Philippines. Cosmopolitan 

 in tropical and subtropical regions. 



2. LEPISTEMON Blume 



Twining herbs with cordate, entire or slightly lobed, ovate, pubescent 

 leaves. Flowers in very dense, axillary, subcapitate cymes, the brr.cts 

 narrow, deciduous. Sepals 5, sube.qual, hairy, -acute or obtuse. Corolla 

 small, pale-yellow or nearly white, the tube narrowed and short-cylindric 



