458 202. CONVOLVULACEAE 



tion. stamens as many as and alternating with the corolla-lobes, inserted oi> 

 the corolla. Anthers 2-celled, opening inwards or laterally by longitudinat 

 shts. Disc within the stamens, sometimes indistinct. Ovary superior, i — 4- 

 celled, sometimes deeply divided. Ovules i — 4 in each cell, rarely {Hunt- 

 bertia) more, erect, inverted. Styles i — 2, sometimes 2-cleft. Seeds albumin- 

 ous ; embryo with folded cotyledons. — Genera 34, species 450. (Plate 131.) 



1. Plants without green colour, parasitic. Stem herbaceous, twining. Leaves 



reduced to scales or wanting. Flowers small, in fascicles. Corolla 

 imbricate in bud, usually with scales at the throat. Ovary completely 

 or incompletely 2-celled with 4 ovules. Embryo twisted, without 

 cotyledons. — Species 25. Some of them are noxious weeds, several! 

 are used medicinally. " Dodder." [Tribe CUSCUTEAE.] 



Cuscuta L. 



Plants of green colour. Corolla plicate or valvate in bud, rarely (Cressa) 



imbricate, but then stem shrubby. Embryo straight or slightly curved, 



with 2 cotyledons 2 



2. Calyx minute. Ovary i-celled with 2 ovules. Styles 2. Fruit i-seeded. 



ripening underground. Creeping herbs. Leaves kidney-shaped. 

 Flowers solitary. — Species i. Abyssinia. [N ephrophyllum A. Rich.) 



Hygrocharis Höchst. 

 Calyx distinctly developed 3 



3. Ovary lobed or divided. Ovules 4. Styles 2, inserted between the lobes 



of the ovary. Sepals more or less united below. Flowers solitary. 



Creeping or prostrate herbs. [Tribe DICHONDREAE.] ... 4 



Ovary entire. Sepals free, rarely {Rapona) united below, but then ovules 2, 



style 2-cleft, flowers in panicles, and stem twining 5. 



4. Ovary and fruit 2-lobed. Corolla deeply cleft, yellow. Sepals nearly free. 



Leaves kidney-shaped. — Species i. Tropical and South Africa, also 



naturalized in the Island of Madeira Dichondra Forst. 



Ovary and fruit 4-parted. Corolla slightly lobed. Sepals evidently united 

 below. — Species 4. South Africa and Abyssinia. . Falkia L. f. 



5. Styles 2, free or united below 6 



Style I, undivided ; stigmas 2, continuous at the base, or a single stigma. 16 



6. Flowers in axillary or terminal and axillary racemes or panicles. Twining 



shrubs. [Tribe PORANEAE.] 7 



Flowers solitary ,in axillary cymes, or in terminal spikes or heads. Ovules 4. 

 [Tribe DICRANOSTYLEAE.] 10 



7. Sepals united below, not enlarged in the fruit. Corolla entire, with plicate 



aestivation. Filaments broadened and hairy at the base. Disc large, 

 cup-shaped. Ovary incompletely 2-celled, with i ovule in each cell. 

 Style 2-cleft at the top, with capitate stigmas. — Species i. Madagascar. 



Rapona BailL 



Sepals free. Corolla more or less lobed. Disc small. Ovary i — 2-celled, 



with 2 ovules in each cell. Style deeply 2-cleft or divided to the base. 8 



