70 CLASS-BOOK OF BOTANY. 
the lips apart. That this is so has been proved by the fact 
that after the stigma has been covered with pollen the elas- 
Fig. 126. Flower of Antirrhinum ; longitudinal 
section. 
ticity of the corolla diminishes, so that ants and other insects 
can get in and carry off the nectar. The four stamens stand 
close against the upper lip in such a position that a bee, 
forcing its way into the flower, is certain to brush the head 
and back against them. ‘Two have long and two short fila- 
ments, and this form of cohesion is called didynamous.* 
The anther-cells diverge somewhat 
widely. The 2-celled ovary is fur- 
nished with a simple style, ending 
in an imperfectly-2-lobed stigma, 
which -projects between the upper 
Fig. 129. Capsule 
pind . of Antirrhinum, 
Fig. 127. Upper lip of corolla Fig. 128. Capsule of dehiscing by 
of Antirrhinum, with didy- Antirrhinun (im- pores. 
namous stamens. mature). 
and lower anthers. ‘The fruit is a capsule, of which the 
upper cell opens by one large pore and the lower by two 
small ones. The small seeds have a ridged and prickly testa, 
and a straight embryo in fleshy endosperm. 
Compare with this type one or other of our numerous 
species of Veronica, one of the most characteristic of New 
Zealand genera. With a very few exceptions all these plants 
are shrubs, and many of them so imitate other plants in their 
* Gr. dis, twice; dunamis, power. 
