188 THE FERTILISATION OF FLOWERS. | PART III. 
completely, and remain in the wide lower part of the carina ~ 
(2, Fig. 61). The five inner anthers now begin to grow rapidly, and 
squeeze the pollen in the point of the carina more by means of their 
anthers, which remain spherical, than by the thickened ends of 
their filaments; they thus do the work of a piston, except the 
superior stamen (1), which remains inferior to the others in length 
and thickness. | 
Fic. 61.—Lupinus luteus, L. 
1.—Essential organs, from a bud ; the outer anthers are dehiscing. 
2. Pic wre from a flower. 
2, 4, 6, 8, 10, the tive outer ; 1, 3, 5, 7, 9, the five inner stamens; 2, stigma. 
The spherical stigma is surrounded at its base, like that of the 
Laburnum, by a ring of stiff erect hairs which prevent or limit the 
application of its own pollen. 
I have noticed only the following visitors :— 
Hymenoptera—A pide: (1) Apis mellifica, L. %, ab., c.p.; (2) Bombus 
lapidarius, L. §, scarce, c.p. ; (8) Megachile circumcincta, K. ?, ¢.p. 
The flower of Zupinus albus differs in certain points from the 
preceding species (cf. Delp. 178, pp. 46, 47). 
Lupinus, sp—Mr. Swale observed that in New Zealand cultivated 
varieties of Lupinus were unfertile unless he released the stamens 
with a pin. In England, according to Darwin, the Lupines are 
fertilised by humble-bees, not by hive-bees (152). 
108. GENISTA TINCTORIA, L.—In the young bud the ten stamens 
are distinctly seen to form two whorls (1, Fig. 62). The five 
anthers of the outer whorl (2, 4, 6,8, 10 in 1, Fig. 62), overtop 
those of the inner, and the four superior ones are the first to 
