138 KEY TO NATURAL ORDERS. [chap. 



pulate simple entire leaves. Flowers regular. Stamens five, 

 alternate witli corolla-lobes. Carpels two, usually distinct 

 in the ovary, united in the style and stigma. 



AscLEPiADE^ (p. 239). — Shrubs or herbs, often climbing, 

 with opposite entire exstipulate leaves. Flowers regular. 

 Stamens five; anthers coherent around the stigma; pollen 

 usually consolidated in masses attached to minute stigmatic 

 glands. Carpels as in ApocynacecB. 



LoGANiACE^ (p. 242). — Trees, shrubs, or herbs, sometimes 

 twining, with opposite entire leaves, often with interpetiolar 

 stipules. Flowers regular. Stamens as many as, and alter- 

 nate with, the corolla-lobes. Ovary usually two-celled. 



Gentianace^ (p. 243). — Herbs with opposite entire 

 leaves, rarelv twining, or an aquatic with floating leaves; 

 taste bitter. Flowers regular. Stamens as many as, and 

 alternate with, the corolla-lobes. Ovary usually one-celled, 

 with parietal placentas and indefinite ovules. 



BiGNONiACEyE (p. 244). — Usually climbing shrubs or trees 

 with opposite, rarely simple, exstipulate leaves. Flowers 

 irregular. Stamens fewer than corolla-lobes. Ovary two- 

 celled, with indefinite ovules. Fruit a capsule, with winged 

 seeds. 



PEDALiACEiE (p. 245). — Hcrbs with opposite leaves. 

 Flowers irregular. Stamens fewer than corolla-lobes. 

 Pistil usually dicarpellary with the ovary four-celled ; 

 ovules indefinite, rarely solitary. 



CoNVOLVULACE/E (p. 247). — Herbs, shrubs, or rarely trees, 

 usually twining or prostrate (in Ciisciita a leafless parasite), 

 with alternate leaves, and usually showy regular flowers, 

 with a plaited funnel-shaped corolla. Stamens as many as 

 corolla-lobes, and alternate with them. Ovary two- or four- 

 celled, with one or two ovules in each cell. Cotyledons 

 usually folded. 



