GENERAL KEY TO THE GAMOPETALOUS ORDERS. 5 



94. CONVOLVULACE.E. Leaves alternate aud petioled. Stems usually twining or 

 trailing, but some erect, many with milky jnioe. Flower.? borne by axillary pedun- 

 cles or cymose-glonierate. Calyx of imbricated sepals. CnroUa with fnur-five-lobed 

 or commonly entire margin, plicate and the plaits convolute in the bud, sometimes 

 induplicate-valvate or imbricated. Ovary two-celled or sometimes three-celled, with 

 a pair of erect anatropous ovules in each cell, becoming oomparati\-ely large seeds 

 (these sometimes separated ]ij spurious septa of the capsular fruit), with smooth or 

 hairy testa. Embryo incurved, with ample foliaceous plaited and crumpled cotyle- 

 dons (in Cuscuta embryo long and spiral without cotyledons) surrounded by little 

 or no albumen : radicle inferior. IHchondra has two distinct ovaries. 



95. SOLANACEaE. Leaves alternate, sometimes unequally geminate. Inflorescence 

 various, but no truly axillary flowers. Corolla in some a little irregular, its lobes or 

 border induplicate-plicate or rarely imbricate in the bud. Ovary normally two-celled 

 (occasionally three-ftve-celled) and undivided, with many-o\'uled placentae in the 

 axis : style undivided : stigma entire or bilamellar. Seeds numerous, with incurved 

 or coiled or rarely almost straight embryo in copious fleshy albumen : cotyledons sel- 

 dom much broader than the radicle. 



++++++ Corolla irregular, more or less bilabiately so (|) ; its lobes variously 

 imbricate or convolute, or sometimes almost regular : stamens fewer than 

 corolla-lobes, four aud didynamous, or only two : style undixided : stigma 

 entire or two-lobed or bilamellar ; the lobes anterior and posterior : ovary 

 in all dicarpellarj' ; the cells or carpels anterior and posterior. 

 = Pluriovulate or multiovulate. 



96. SCROPHULARIACEiE. Ovary and capsule completely two-celled : placentse occu- 

 pying the middle of the partition. Seeds comparatively small or minute, mostly in- 

 definitely numerous, sometimes few. Embryo small, straight or slightly curved, in 

 copious fleshy albumen : cotyledons hardly broader than the radicle. 



97. OROBANCHACE.E. Ovary one-celled with two or four (doubled) parietal many- 

 ovuled placentae. Seeds very many in fleshy albumen, with minute embryo, having 

 no obvious distinction of parts. Root-parasites, destitute of green herbage. 



98. LENTIBULARIACE.E. Ovary one-celled, with a free central multiovulate pla- 

 centa : globular capsule mostly bursting in'egularly. Seeds destitute of albumen, 

 filled by a solid oblong embryo. Bilabiate corolla personate and calcarate. Stamens 

 two ; anthers confluently one-celled. Aquatic or paludose jilants, with scapes or 

 scapiform peduncles, sometimes almost leafless. 



99. BIGNONIACE^. Ovary and capsule two-celled by the extension of a partition 

 beyond the two parietal placentae, or in some genera simply one-celled. Seeds 

 numerous, large, commonly winged, transverse, filled by the horizontal embryo : 

 cotyledons broad and foliaceous, -plane, emarginate at base and summit, the basal 

 notch including the short radicle : no albumen. Trees or shrubs, many climbing, 

 large-flowered : leaves commonly opposite. 



100. PEDALIACEjE. Ovary one-celled, with two parietal intruded placentae, which 

 are broadly bilamellar or united in centre, or two-four-celled by spurious septa from 

 the walls. Fruit capsular or drupaceous, few-many-seeded. Seeds wingless, with 

 thick and close testa, filled by the large straight embryo : cotyledons thickish. Herbs, 

 with mainly opposite simple leaves : juice mucilaginous. 



