FERTILIZATION. 167 
by hairs, 2 in IV, or by appendages, kin VI. Those flowers 
which have one or more sepals or petals prolonged into spurs, 
like the nasturtium and the columbine, are inaccessible to 
most insects except those which have a tongue, or a sucking- 
SS} HA Z7 . 
% f~ ZF EK 
i 
EA 
CYT i—— 
eax = XA 
KI —x— 4 — =~ 
| \ SS . WZ a a / 
\ ‘“y 
Vig 
Fig. 149. — Branching Hairs from the Outside of the Corolla of the Com- 
mon Mullein (magnified). 
dr, a gland. 
tube long enough to reach to the nectary at the bottom of the 
spur. The large sphinx moth, shown in Fig. 150, which is a 
common visitor to the flowers of the evening primrose, is an 
S SS wu? 
47 
Fia. 150. — A Sphinx Moth, with a Long Sucking-Tube. 
example of an insect especially adapted to reach deep into 
long tubular flowers. 
