Rose family
Rosaceae is divided into four subfamilies, mainly on the basis of how the fruit develops:
- The rose is a rose
and was always a rose;
But the theory now goes
That the apple's a rose,
And the pear is, and so's
The plum, I suppose.
You, my love, are a rose,
but were always a rose.
- - Robert Frost, "The Rose Family"
http://www.life.uiuc.edu/plantbio/260/Rosaceae/Rosehome.html as of 2002-05-29