XXIV 
ANALYTICAL KEY. 
Ovules numerous or at least as many as 2 in each cell. 
Ovary and pod 1-celled, 
With a free central placenta; stamens 2. . LentibulacEyE. 
With 2 or more parietal very many-seeded pla- 
centae; stamens 4 OrobanchacEyE, 62 
Ovary and fruit more or less 4-5 celled.. . PedaliacEyE. 
Ovary and pod 2-celled, but the 2 placentae parietal. BignoniacEyE, 62 
Ovary and pod 2-celled, placentaae in the axis. 
Seeds rarely few, not on hooks, with albumen. 
ScrophulariacEyE, 61 
Seeds few, borne on hook-like or other pro- 
jections of the placentae ; no albumen. . AcanthacEyE. 
* * 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 Ericaceae, 49 
Stamens inserted on the corolla. 
Ovary deeply 4-lobed around the style. Echium, in BorraginacEyE. 
Ovary not lobed ; pod many-seeded. 
Filaments or some of them woolly. 
Verbascum, in ScrophulariacEyE, 60 
Filaments not woolly. . . . Hysocyamus SolanacEyE. 
* * * Corolla regular. 
-i — Stamens as many as the lobes of the corolla. 
Ovaries 2, separate; their 
Stigmas and styles sometimes united into one. 
Filaments distinct; pollen in ordinary grains. ApocynacEyE, 52 
Filaments monadelphous, polen in masses. AsclepiadacEyE, 52-53 
Ovary one, but deeply 4-lobed around the style (or 
2-lobed in IIeliotropium.) 
Leaves alternate. ...... Borraginaceye, 58 
Leaves opposite. ..... Mentha, in LabiaTyE, 65 
Ovary one, pod 2 lobed or 2-horned at summit. . LoganiacEyE, 53 
Ovary one, not deeply- lobed. 
One-celled, with ovules parietal or on 2 parietal placentae. 
Leaves entire. ....... GentianacEyE, 54-55 
Leaves toothed, lobed, or pinnately compound. 
HydrophyllacEyE, 57 
Two to ten-celled. 
Leafless parasitic twining plants. Cuscuta, in ConvolvulacEyE. 
Leaves opposite, their bases or petioles connected 
by stipules or a stipular line. . . LoganiacEyE, 53 
