320 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 Lobeliacess, p. 431 



GOG. The stamens not inserted on corolla and not 

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



Campanulacess, 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.. Ldbiatse, 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: Ivs. opposite: juice milky: 



styles or stigmas united into 1. 

 i. Stamens separate, inserted on corolla: corolla 

 bell -shaped, funnel- or sal ver - formed :' 



pollen granular, as usual Apocynaceae, p. 418 



n. 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) Asclepiadacex, 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 Lobiatae, p. 400 

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



parietal, or 2 parietal placentae, 

 i. Leaves simple, entire, opposite, exstipulate. . . . 



Gentianaceae, p. 417 

 ii. Leaves toothed, lobed or pinnately compound, 



mostly alternate Hydrophyllaceae, p. 415 



Ovary not deeply lobed, 2-10-celled. 



i. Leaves none: parasites, twining 



Cuscuta in Convolvulaceas, p. 411 

 n. Leaves opposite, without stipules. 



