616. Leaves alternate, at least the upper ones. Anthers opening by a single slit or pore. Seeds albuminous. =208. Scrophulariaceae.= Leaves opposite or whorled. 617 617. Fruit a capsule. Seeds borne on a hook-like process of the funicle, exalbuminous. =216. Acanthaceae.= Fruit a drupe or a nut. Seeds not on a hook-like process of the funicle, albuminous. Stamens 4. Anthers opening by two slits. Herbs. =205. Verbenaceae.= 618. (611.) Flowers distinctly irregular. Stamens united at the base with one another and with the corolla. Anthers opening by a single pore. =120. Polygalaceae.= Flowers regular or nearly so. Anthers opening by two slits or pores. 619 619. Flowers unisexual. Stamens free from the corolla. =122. Euphorbiaceae.= Flowers hermaphrodite. Leaves undivided. 620 620. Calyx and corolla of 2-4 divisions each. Stamens 6-8, free from the corolla or nearly so. =189. Ericaceae.= Calyx and corolla of 5 divisions each. Stamens 5, attached to the corolla; filaments free. Stigmas 2. =200. Apocynaceae.= 621. (605.) Ovules 2 in each cell of the ovary. 622 Ovules 3 or more in each cell of the ovary. 640 622. Fertile stamens 2-3. 623 Fertile stamens 4-30. 626 623. Flowers regular. Stamens 2, alternating with the ovary-cells, rarely 3. Disc wanting. =197. Oleaceae.= Flowers more or less irregular. Stamens not regularly alternating with the ovary-cells. 624 624. Leaves stipulate, alternate. Style 2-cleft. Petals 2-cleft. Seeds exalbuminous. Trees or shrubs. _Tapura_, =121. Dichapetalaceae=. Leaves exstipulate, opposite or whorled, rarely alternate, but then, as nearly always, style simple. 625 625. Seeds borne on a hook-like outgrowth of the funicle, exalbuminous. =216. Acanthaceae.= Seeds not on a hook-like outgrowth of the funicle, albuminous. =208. Scrophulariaceae.= 626. (622.) Fertile stamens 4. 627 Fertile stamens 5-30. 634 627. Corolla with 4 divisions. 628 Corolla with 5 divisions. 632 628. Flowers more or less irregular. Seeds exalbuminous. Leaves opposite or whorled, without stipules. =216. Acanthaceae.= Flowers regular. Seeds albuminous. 629 629. Corolla scarious, regular. Stigma entire. Fruit opening by a lid. Leaves sessile. _Plantago_, =218. Plantaginaceae=. Corolla not scarious. 630 630. Leaves alternate. Styles or stigmas 2. Ovules erect =202. Convolvulaceae.= Leaves opposite or whorled. Shrubs or trees. 631 631. Leaves provided with stipules or connected at their base by transverse lines or ridges. =198. Loganiaceae.= Leaves without either stipules or transverse lines or ridges at their base. =197. Oleaceae.= 632. Leaves alternate, at least the upper ones. Flowers regular or nearly so. Corolla white. Stigma entire or 4-lobed. Fruit a drupe. Seeds albuminous. =217. Myoporaceae.= Leaves opposite or whorled, rarely the upper ones alternate, but then flowers irregular, stigma 2-partite and fruit a capsule or nut. 633 633. Seeds with scanty albumen. Plants with glandular hairs. =210. Pedaliaceae.=