^20 THE KINDS OF PLANTS 



H. Flowers in a head with involucre subtending. . . . 



Compositae, p. 431 

 hh. Flowers not in involucrate heads, but separate: 



corolla irregular Lobeliaceae, p. 431 



ggg. The stamens not inserted on corolla and not 

 united to each other: no stipules: juice milky.. . . 



Campanulaceae, p. 430 

 ff. Ovary superior. 



g. Corolla irregular: stamens 4, in 2 pairs: or 2 

 stamens: the ovary deeply 4-lobed around the 

 style: fruits 4 dry nutlets: stem square.. Labiatae, p. 400 

 gg. Corolla somewhat irregular: stamens 5, inserted on 

 corolla. 



H. The ovary deeply 4-lobed about the style 



Echium in Borraginaceae, p. 412 

 hh. The ovary not lobed: pod many-seeded: fila- 

 ments all or some woolly 



Verbascum in Scrophulariaceae, p. 405 

 ggg. Corolla regular: stamens equal in number to the 

 lobes of the corolla. 

 h. Ovaries 2, distinct: lvs. opposite: juice milky: 

 styles or stigmas united into 1. 

 I. Stamens separate, inserted on corolla: corolla 

 bell -shaped, funnel- or salver - formed : 



pollen granular, as usual Apocynaceae, p. 418 



II. Stamens monadelphous, anthers attached to 

 stigma: a crown of hood-like appendages each 

 containing an incurved horn, borne on the 

 stamen-tube: pollen cohering in masses (waxy 



or granular) Asclepiadaceae, p. 417 



hh. Ovary 1, deeply 4-lobed around style (2-lobed 

 in Heliotropium). 

 I. Leaves alternate: plants usually rough-hairy.. . 



Borraginaceae, p. 412 



ii. Leaves opposite: stems square 



Mentha in Labiatae, p. 400 

 Hhh. Ovary 1, not deeply lobed, 1-celled: ovules 

 parietal, or 2 parietal placenta?. 

 I. Leaves simple, entire, opposite, exstipulate. . . . 



Gentianaceae, p. 417 

 H. Leaves toothed, lobed or pinnately compound, 



mostly alternate Hydrophyllaceae, p. 415 



Hiiiiii. Ovary not deeply lobed, 2-10-celled. 



i. Leaves none: parasites, twining 



Cuscuta in Convolvulaceas, p. 411 

 ii. Leaves opposite, without stipules. 



