202. CONVOLVULACEAE 461 



shrubs. — Species 5. Tropical and South Africa. Some are used as 



vegetables. (Plate 131.) Jacquemontia Choisy 



Stigmas more or less globose. Corolla white or yellow 24 



24. Sepals very unequal, the outer much larger than the inner and decurrent 



on the pedicel, herbaceous. Corolla tubular-funnel-shaped, entire, 

 hairy outside, with well-defined midpetaline areas. Disc obscure. 

 Twining herbs. Leaves oblong. — Species i. Tropical and South-east 



Africa. (Under Ipomoea L.) Aniseia Choisy 



Sepals nearly equal, usually leathery or parchment-like 25 



25. Fruit opening by a lid. Flowers large. Sepals much enlarged in the fruit. 



Corolla without sharply limited midpetaline areas and without dark 

 lines. Twining herbs. Stem usually winged. Leaves broad. — Species 

 6. Tropics. Some are used medicinally. (Under Merremia Dennst. or 



Ipomoea L.) Operculina Manso 



Fruit opening by 4 valves. Corolla bell-shaped ; midpetaline areas 

 usually marked with 5 dark-violet lines. Stem rarely winged. — Species 

 25. Tropical and South Africa. Some species yield fodder and a substi- 

 tute for coffee. (Under Convolvulus L.or Ipomoea L.) Merremia Dennst. 



26. (18.) Fruit fleshy, mealy, or dry, and then with a woody or crusty rind, 



indehiscent. Ovary 2 — 4-celled. Stigmas globose or elliptical. Disc 



cupular. Shrubs. [Tribe ARGYREIEAE.] 27 



Fruit dry, with a membranous leathery or parchment-like rind, dehiscing 

 by 4 — 6 valves, rarely (J^owoß«) indehiscent. [Tribe IPOMOEEAE.] 29- 



27. Fruit fleshy or mealy. Corolla more or less bell-shaped. Stigmas i — 2, 



globose. Stem twining. Leaves cordate. — Species 2. Naturalized in 



the Mascarene Islands. Ornamental plants. . . . Argyreia Lour. 



Fruit dry. Corolla funnel- or salver-shaped. Stigmas 2, globose or 



elliptical 28 



28. Fruit with a woody rind, i-celled, usually i-seeded. Seeds glabrous. — 



Species 10. Central and South Africa and Canary Islands. (Including 



Legendrea Webb, under Ipomoea L.) Rivea Choisy 



Fruit with a crustaceous rind, 4-celled, 4-seeded, enveloped by the adnate 

 sepals. Seeds large, brown-velvety. Ovary 4-celled. Corolla funnel- 

 shaped. Stem twining. Leaves cordate. — ^ Species 4. Tropics. (Under 

 Argyreia Lour., Rivea Choisy, or Ipomoea L.) . Stictocardia Hallier 



29. Filaments with a large scale at the base within. Corolla shortly lobed. 



Disc cupular. Ovary 2-celled. Ovules 4. Stigma capitate, 2-Iobed. 



Twining herbs. Leaves usually lobed. Flowers in axillary cymes. 30 



Filaments without a scale at the base 31 



30. Sepals distinctly unequal. Corolla beU-shaped. Fruit 2-valved. Seed- 



coat granular. Flowers medium-sized. — Species i. East Africa. 



Lepistemonopsis Dammer 



Sepals nearly equal. Corolla pitcher-shaped. Fruit 4-valved. Seed-coat 



smooth. Flowers small. — Species 2. Central Africa. Noxious to 



cattle Lepistemon Blume 



