662. Corolla with valvate or folded aestivation. 663 Corolla with imbricate or contorted aestivation. 665 663. Stamens free from the corolla. Herbs. _Lightfootia_, =224. Campanulaceae=. Stamens attached to the corolla. 664 664. Corolla almost entire, somewhat irregular. Trees. _Humbertia_, =202. Convolvulaceae=. Corolla lobed, rarely almost entire, but then herbs or undershrubs. =207. Solanaceae.= 665. Corolla with contorted aestivation. Style stigmatose beneath the thickened and sometimes 2-lobed apex. =200. Apocynaceae.= Corolla with imbricate, not contorted aestivation. Style (or styles) stigmatose at the apex or between the apical lobes. 666 666. Styles 2, free or united at the base. Disc wanting. Corolla regular Seeds albuminous; embryo straight. Herbs or undershrubs. =203. Hydrophyllaceae.= Style 1, undivided. 667 667. Seeds winged, exalbuminous. Fruit a loculicidal capsule. Stigmas 2. Corolla slightly irregular. Shrubs. =209. Bignoniaceae.= Seeds not winged, albuminous. 668 668. Seeds with straight embryo. Fruit a capsule opening lengthwise. Stigma 1. Corolla slightly irregular; tube short. =208. Scrophulariaceae.= Seeds with curved embryo. Fruit a capsule opening by a lid, or a berry. Anthers opening by two longitudinal slits. =207. Solanaceae.= 669. (604.) Ovule 1 in each ovary-cell 670 Ovules 2 or more in each ovary-cell. 685 670. Stamens as many as and alternate with the divisions of the corolla, or fewer. 671 Stamens as many as and opposite the divisions of the corolla, or more. 679 671. Flowers unisexual, regular. Corolla divided almost to the base. Disc wanting. Fruit a drupe. Shrubs or trees. Leaves alternate. _Ilex_, =128. Aquifoliaceae=. Flowers hermaphrodite, rarely polygamous. 672 672. Anthers opening by an apical pore. Stamens 5. Ovary 3-celled. Flowers irregular. =120. Polygalaceae.= Anthers opening by two longitudinal slits sometimes confluent at the apex; in the latter case ovary 4-celled. 673 673. Stamens free from the corolla or scarcely adhering to it, 4. Flowers regular. =189. Ericaceae.= Stamens evidently attached to the corolla-tube. 674 674. Corolla scarious, 4-lobed, regular. Stamens 4. Disc wanting. Stigma 1. Ovules pendulous or laterally affixed. Fruit opening by a lid. _Plantago_, =218. Plantaginaceae=. Corolla not scarious. 675 675. Corolla with valvate or folded aestivation, regular. Stamens 5. Leaves alternate. =202. Convolvulaceae.= Corolla with imbricate or contorted aestivation. 676 676. Stamens as many as the divisions of the corolla. Ovules with the micropyle directed upwards. Leaves, all or the upper ones, alternate, undivided. Inflorescences cymose, usually one-sided and coiled when young. =204. Borraginaceae.= Stamens fewer than the divisions of the corolla, rarely the same number, but then ovules with the micropyle directed downwards and leaves opposite or whorled. 677