lxxviii INTRODUCTION. 



§ 3. Corolla hypogynous, bearing the stamens, 

 * Placenta free central. 



XLVI. Primulacese. Stamens isomerous and opposite the corolla- 

 lobes. 



XLVII. Lentibulacese. Corolla very irregular. Stamens fewer than 

 the lobes, and alternate with them. 



** Placentas parietal, or in the axial angle of the cells, 

 a. Corolla regular, or nearly so. 



XLVIII. Oleaceae. Trees or shrubs. Stamens 2, alternating with the 

 2 ovary-cells, and having no constant relation to the corolla-lobes. 



XLIX. Apocynacese. Corolla contorted. Stamens isomerous. Ovary 

 of 2 carpels, usually distinct, whilst the styles are united at the top. 



L. Gentianacese. Bitter plants. Corolla contorted. Stamens iso- 

 merous. Placentas parietal, rarely meeting in the axis. 



LI. Polemoniaceae. Corolla contorted. Stamens isomerous. Ovary 

 3-celled, with several seeds. 



LII. Convolvulaceae. Corolla plaited. Stamens isomerous. Ovary 

 2- or 3-celled, with 2 (rarely 1) ovules in each, often separated by an 

 additional false partition. 



LIII. Boraginese. Stamens isomerous. Ovary 2- or 4-lobed, with 

 one ovule in each lobe. 



LIY. Solanacese. Stamens isomerous. Corolla plaited or imbricate. 

 Ovary 2-celled, with several ovules in each cell. 



j8. Corolla irregular. Stamens 1 less or 3 less than the lobes* 



LV. Orobanchacese. Leafless parasites. Placentas parietal, or rarely 

 meeting in the axis. 



LVI. Scrophularinese. Ovary 2-celled, with several ovules in each cell. 



LVII. Labiatas. Ovary 4-lobed, with 1 ovule in each lobe. 



LVIII. Verbenaceas. Ovary entire, 2- or 4-celled, with 1 ovule in 

 each cell. 



*** Anomalous families. 



LIX. Plumbaginese. Ovary with 1 cell and ovule, but several styles. 

 LX. Plantagineae. Corolla scarious. Stamens isomerous. 



Subclass 4. Monochlamydjs. — Perianth really or apparently simple 

 or none. [Exceptions. — Petals are present in some Illecebraceae. 



LXI. Illecebracege. Perianth small, rarely double. Ovary with 1 

 cell and ovule, but 2 or 3 styles or stigmas. Leaves usually opposite, 

 . with scarious stipules. 



LXII. Chenopodiaceaa. Perianth small ; stamens opposite to its lobes. 

 Ovary with 1 cell and ovule, but 2 or more styles or stigmas. No 

 stipules. 



LXIII. Polygonaceas. Perianth small. Ovary with 1 cell and ovule, 

 but 2 or more styles or stigmas. Stipules sheathing. 



LXIV. Thymeleaceae. Stamens inserted in the tube of the perianth, 

 and usually double the number of its lobes. Ovary free, with 1 pen- 

 dulous ovule. One style. 



