With 2 or more parietal very many-seeded placentæ; stamens 4. OROBANCHACEÆ, 393 Ovary and fruit more or less 4--5-celled. PEDALIACEÆ, 399 Ovary and pod 2-celled, but the 2 placentæ parietal. BIGNONIACEÆ, 398 Ovary and pod 2-celled; placentæ in the axis. Seeds rarely few, not on hooks, with albumen. SCROPHULARIACEÆ, 377 Seeds few, borne on hook-like or other projections of the placentæ; no albumen. ACANTHACEÆ, 399 [*][*] _Corolla somewhat irregular; stamens (with anthers) 5._ Stamens free from the corolla; anthers with their cells opening by a hole or chink at the top. Rhododendron, in ERICACEÆ, 320 Stamens inserted on the corolla. Ovary deeply 4-lobed around the style. Echium, in BORRAGINACEÆ, 367 Ovary not lobed; pod many-seeded. Filaments or some of them woolly. Verbascum, SCROPHULARIACEÆ, 379 Filaments not woolly. Hyoscyamus, SOLANACEÆ, 376 [*][*][*] _Corolla regular._ [+] _Stamens as many as the lobes of the corolla._ Ovaries 2, separate; their Styles and stigmas also wholly separate. Dichondra, CONVOLVULACEÆ, 368 Stigmas and sometimes styles united into one. Filaments distinct; pollen in ordinary grains. APOCYNACEÆ, 337 Filaments monadelphous; pollen in masses. ASCLEPIADACEÆ, 338 Ovary one, but deeply 4-lobed around the style (or 2-lobed in Heliotropium). Leaves alternate. BORRAGINACEÆ, 360 Leaves opposite. Mentha, in LABIATÆ, 407 Ovary one; pod 2-lobed or 2-horned at the summit. LOGANIACEÆ, 345 Ovary one; not deeply lobed, One-celled, one-ovuled, becoming an achene. PLANTAGINACEÆ, 422 One-celled, with ovules parietal or on 2 parietal placentæ. Leaves (or in Menyanthes three leaflets) entire. GENTIANACEÆ, 346 Leaves toothed, lobed, or pinnately compound. HYDROPHYLLACEÆ, 357 Two- to ten-celled. Leafless parasitic twining plants. Cuscuta, in CONVOLVULACEÆ, 370 Leaves opposite, their bases or petioles connected by stipules or a stipular line. LOGANIACEÆ, 345 Leaves when opposite without stipules. Stamens free from the corolla or nearly so; style 1. ERICACEÆ, 309 Stamens almost free from the corolla; style none. ILICINEÆ, 107 Stamens in the sinuses of the corolla; style 1. DIAPENSIACEÆ, 326 Stamens inserted on the tube of the corolla, Four; pod 2-celled, circumscissile. PLANTAGINACEÆ, 422 Four; ovary 2--4-celled; ovules solitary. VERBENACEÆ, 401 Five or rarely more.