462 202. CONVOLVULACEAE — 203. HYDROPHYLLACEAE 



31. Stigmas 2, oblong or linear. Corolla funnel-shaped, white red or violet. 



Seeds hairy. Plants with star-shaped hairs. — Species 20. Central 



and South-east Africa Astrochlaena HaUier 



Stigmas i — 3, more or less capitate. Plants without star-shaped hairs. 32 



32. Pedicels club-shaped, becoming large and fleshy in the fruit. Sepals 



cartilaginous, pointed or awned. Corolla very large, regular, salver- 

 shaped, white or violet. Ovary 2-celled. Stigma biglobose. Seeds 

 glabrous. Twining herbs. Leaves cordate or lobed. — Species 2. 

 Naturalized in the tropics. Ornamental and medicinal plants ; the 

 young seeds are edible. (Under Ipomoea L.) . Calonyction Choisy 

 Pedicels not much thickened in the fruit 33 



33. Anthers and stigmas projecting beyond the corolla-tube. Ovary 4-celled. 



Corolla scarlet, medium-sized, salver-shaped, usually somewhat irregular. 

 Sepals herbaceous, ending in a short point. Seeds glabrous or downy. 

 Twining herbs. Leaves cordate, lobed, or pinnately dissected. Flowers 

 in cymes. — Species 2. Naturalized in the tropics and in South Africa. 

 Ornamental plants. (Under ipomoea L.) . . Quamoclit Tourn. 

 Anthers and stigmas usually concealed within the corolla-tube. Ovary 

 I — 3-celled, rarely 4-celled, but then corolla not scarlet and salver-shaped. 

 Corolla regular. — Species 220. Some of them (especially the sweet 

 potato, I. Batatas Lam.) yield edible tubers from which also starch and 

 brandy are prepared, besides vegetables, fodder, and medicaments, 

 others are used in preparing rubber, for fixing sand-dunes, or as orna- 

 mental plants. (Including Batatas Choisy and Pharhitis Choisy). 



Ipomoea L. 

 SUBORDER BORRAGININEAE 

 FAMILY 203. HYDROPHYLLACEAE 

 Erect herbs or undershrubs. Juice not milky. Leaves alternate, herbaceous, 

 undivided, without stipules. Flowers solitary or in cymes or panicles, regular, 

 hermaphrodite. Sepals united at the base, narrow, imbricate in bud. Corolla 

 more or less bell-shaped, 5 — 12-cleft, imbricate in bud. Stamens as many as 

 and alternating with the corolla-lobes, inserted on the lower part of the corolla- 

 tube, equal or subequal in length. Anthers attached at the back, opening 

 inwards by two longitudinal slits. Disc none. Ovary superior, completely or 

 almost completely 2-celled, with numerous descending, inverted ovules in 

 each cell. Styles 2, free or partly united. Fruit a capsule opening by 2 — 4 

 valves or irregularly. Seeds with a small, straight embryo and copious albumen. 

 — Genera 2, species 8. Tropical and South Africa. 



Flowers 5-merous. Corolla blue. Styles free. Placentas free from the 

 pericarp. Seed-coat wrinkled. Glandular-hairy or glabrous plants. — 

 Species 6. Tropics. [Tribe HYDROLEEAE.] . . . Hydrolea L. 

 Flowers 8 — 12-merous. Corolla white or yellow. Styles united below. 

 Placentas attached to the valves of the fruit. Seed-coat bladdery. 

 Spinous plants. — Species 2. South Africa to Damaraland. [Tribe 

 PHACELIEAE.] Codon L. 



