but perhaps F. viscida y. is more frequently met with than the rest, and 
this variety displays some at least of its flowers throughout the day, while 
those of the others are extremely fugitive. This is especially the case 
with F. levipes, Spach, the petals of which have usually fallen before 
eleven o’clock on bright days. Differences of this kind are probably of 
great importance in the maintenance of races and species, as affording 
checks to intercrossing and favouring the visits of distinct insects. 
EXPLANATION OF Pirate LXXV.—Fig. A 1, pistil of F. viscida a. 
thymifolium, magnified. B, #. viscida B. Barreliert. C 1, and C 2, 
fertile and barren stamens of F’. viscida y. juniperina, magnified. C 38, 
pistil of the same. C 4, seed, and C 5, section of the same, magnified. 
C 6, pair of leaves and their stipules with young leaves in their axils, 
magnified. C 7, leaf of the same, magnified. D 1, pistil of F, levipes, 
magnified. D 2, leaf and stipules of the same, magnified. 
