CLASSIFICATION 179 
Note that in many Papilionaceae the same result is 
brought about by the style having a brush of hairs to 
sweep out the pollen, eg. Lathyrus. A few explode 
when an insect visits them and it is thus dusted with 
pollen, e.g. Medicago. 
152. N. O. Geraniaceae. — General Characters. — 
Flowers polypetalous, hypogynous, pentamerous, usually 
regular ; stamens 10, fruit a schizocarp. 
Type.—Pelargonium (garden geranium). 
Inflorescence.—A cyme. 
Flower.—Zygomorphic, complete. 
Calyx.—Polysepalous, 3 + 2, inferior. The posterior 
sepal forms a long spur which is adherent to the pedicel 
and contains honey. 
Corolla.—Polypetalous, 2 + 3, hypogynous. 
Androecium.—T stamens, 3 staminodes, monadelphous, 
hypogynous, anthers basifixed, introrse. Filaments ex- 
panded at base. 
Gynoectum.—Syncarpous 5, superior, stigma 5-fid. 
Styles fused round a prolongation of the axis called a 
carpophore; ovary 5 celled, with 1 or 2 ovules in each 
cell. 
Fruit.—A schizocarp. The 5 carpels with their long 
persistent styles separate from the carpophore and roll 
up with some force, so that the seeds are shot out. 
Pollination.—The flower is markedly protandrous 
and the corolla attracts insects who must touch the 
anthers before they can reach the honey in the long spur. 
Only long-tongued insects can reach it. If they then 
visit an older flower they will deposit this pollen on the 
stigmas. 
12* 
