NATURAL ORDERS. 273 



capsular, with two opposite, parietal placentae. Seeds numerous, 

 minute ; emhryo erect, in the axis of fleshy albumen. 



G ENU3. — Conradia. 



485. BiGNONiACE^, tli& Trumpet-flower Tribe, — Trees^ shruhs^ 

 or he7'hs, often twining or climbing. Leaves opposite, com- 

 pound, or occasionally simple. Calyx divided or entire, often 

 s^^athaceous. Corolla irregular, 4-5-lobed. Stamens 5, unequal, 

 or 4 and didynamous ; always 1, sometimes 3 barren stamens. 

 Ovary 2-celled, with the placentae in the axis. Dish annular, 

 or glandular. Capsule 2-celled, 2-Yalved. Seeds numerous, 

 winged, destitute of albumen ; emhryo straight. 



Genera. — Biguonia, Catalpa, Gclseminura. 



Sub-order, SESAMiE — has few and wingless seeds; fruit indu- 

 rated or drupaceous, often 2 to 4 horned. 



Geneu^v. — Martynia, Sesamum. 



486. — AcANTHACEiE, tJie Acanthus Tribe. — Herbs or shrubs. 

 Leaves opposite, simple, entire or serrated. Calyx in 4-5 di- 

 visions, sometimes cut into many pieces, or entire and obsolete, 

 persistent. Corolla mostly irregular; limb ringent or bilabi- 

 ate. Stamens 2, sometimes 4, didynamous, shorter ones often 

 sterile. Ovary seated in a disk, 2-celled, the cells 2 or many 

 seeded. Fruit a capsule. Seeds usually supported by hooked 

 processes of the placenta, without albumen ; emhryo curved or 

 straiaiht. 



Genera. — Elytraria, Justicia, Ruellia. 



487. ScROPHULARixVCE^, the Figioort Tribe. — Herbs or iinder- 

 shrubs.) sometimes shrubs. Leaves opposite, whorled, or alter- 

 nate. Calyx inferior, persistent, divided into 4 or 5 parts, un- 

 equal. Corolla, more or less irregular and bilabiate, or person- 

 ate, aestivation imbricate. Stamens usually 4, didynamous, in 

 a single series opposite the sepals. Ovary free, 2-celled. Fruit 

 capsular. Seeds numerous, albuminous ; embryo straight or 

 slightly curved. This order has been divided into three sec- 

 tions : 1, Salpiglossidse — Inflorescence centrifugal ; aestivation of 

 the corolla plaited or plaited-imbricate ; the 2 upper segments 

 external. 2, Antirrhinidaa — Inflorescence centripetal or com- 

 pound ; aestivation of the corolla bilabiately imbricated ; the 2 

 upper segments being external. 3, Rhinanthideae — Liflores- 

 cence centripetal or compound ; aestivation quincuncial or ir- 

 regularly imbricated ; one of the lateral segments external, the 

 two upper internal. 



a. Propertiea : acrid and bitter, some species are sedative and poisonous. 

 Genera. — 1. SALPioLossiDyE — Salpiglossis. 2. Antirrhin^ — Verbascum, Antir- 

 rhinum, Scrophularia, Ccllinsia, Chelone, Pentstemon, ^Mimulus, Hcrpestis, Gratiola. 



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