GENERAL KEY TO THE GAMOPETALOUS ORDERS. 5 



94. CONVOLVULACEzE. Leaves alternate and petioled. Stems usually twining or 

 trailing, but some erect, many with milky juice. Flowers borne by axillary pedun- 

 cles or cymose-glomerate. Calyx of imbricated sepals. Corolla with four-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 comparatively large seeds 

 (these sometimes separatea by 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. Dichondra has two distinct ovaries. 



95. SOLANACEyE. Leaves alternate, sometimes u.iequally 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-five-celled) and undivided, with many-ovuled 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. 



++ -H. .H. Corolla irregular, more or less bilabiately so (f ) ; its lobes variously 

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

 corolla-lobes, four and didynamous, or only two : style undivided : stigma 

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

 in all dicarpellary ; the cells or carpels anterior and posterior. 



= Pluriovulate or multiovulate. 



96. SCROPHULARIACE JL Ovary and capsule completely two-celled : placentae 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. OROBANCHACEyE. Ovary one-celled with two or four (doubled) parietal many- 

 ovuled placenta?. 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 irregularly. Seeds destitute of albumen, 

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

 two : anthers confidently one-celled. Aquatic or paludose plants, with scapes or 

 scapiform peduncles, sometimes almost leafless. 



99. BIGNONIACEyE. 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 ai.i foliaceous, plane, emarginate at base and summit, the basal 

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

 large-flowered : leases commonly opposite. 



100. PEDALIACE^E. 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. 



