CUP FLOWERS 307 * 
simple that at first sight we scarcely recognize it as a Cup 
Flower. The expanded rim below the globular axis is 
however the beginning of the cup form of the flower axis. 
562. The Spiraea or Bridal Wreath (Spiraea) of the 
gardens shows a great reduction in the number of carpels, 
from many (in the Strawberry) to five 7 
each with several ovules, and with this WO, 
we have the disappearance of the globular &® 
flower axis, while the fleshy rim or disk 
has now become somewhat cup-shaped. On the margin 
of the cup are borne the many stamens, usually 20, in 
whorls of 5 or 10 each, the five separate, white, rounded 
petals, and the five separate pointed, green sepals. 
563. The Rose flower (Rosa) shows a considerable 
advance over that of the Spiraea in its general structure 
although more primitive as to its carpels and stamens. 
The cup is very deep and completely encloses the many 
free, biovulate (but one-seeded) carpels. The stamens 
are very many (40-50, or more) in whorls of 5 or 10, 
attached to the cup margin. The five petals are large and 
rounded, and with the pointed, green sepals are attached 
to the margin of the cup. After flowering the cups ri- 
pen into edible, fleshy “rose-apples.”’ 
Fig. 181.—Spiraea. 
‘) @ 
Fig. 182.—Rosa. Fig. 183.— Malus. 
564. In the Apple flower (Malus) the cup is still 
deeper, narrower, and more fleshy, and it encloses and is 
grown to the five, slightly united biovulate carpels. 
The many stamens, 20 or more, in whorls of 5 or 10 each, 
