XXVili INTRODUCTION TO BOTANY. 
The relative adhesion of the floral whorls may vary ; hypogynous stamens 
appearing in flowers usually with perigynous, and free or half-free ovaries 
in flowers usually with adherent. 
Plants usually monoecious or dioecious may become occasionally hermaphro- 
dite, or hermaphrodite plants may produce occasionally unisexual flowers 
by the abortion of the stamens or of the pistils. 
Leaves alternate where they are usually opposite; cut or divided where 
usually entire ; variegated or spotted where usually of one colour, or the 
reverse, must also be classed among those accidental aberrations which 
_ ist must always be on his guard against mistaking for specific 
istinctions. 
