MONOCOTYLEDONS AND DICOTYLEDONS 



263 



Many of the true roses have a strong resemblance (Fig. 

 207) to the buttercups (Ranunculus), with their hypogy- 

 nous regular flowers, and indefinite number of stamens and 

 carpels, but the sepals and petals are much more frequently 

 five, the Dicotyl number being better established. The 



FIG. 249. The common pear (Pirus Comments), showing branch with flowers (1), sec- 

 tion of a flower (2) showing its epigynons character, section of fruit (3) showing 

 the thickened calyx outside of the ovary or "core" (indicated by dotted outline), 

 and flower diagram (k) showing all the organs in fives except the stamens. After 



WOSSIDLO. 



whole family remains actinomorphic, but perigyny and 

 epigyny appear in certain forms (Fig. 205), giving rise to 

 the peculiar fruit (pome) of apples and pears (Fig. 249), in 

 which the calyx and ovary ripen together. Another spe- 

 cialized group of roses is that which develops the stone- 



