THE FLOWER 209 
ovules and seeds. Draw the ovary in cross and vertical 
sections, labeling correctly all the parts. 
229. The numerical plan of dicotyls. — Diagram the plan 
of the flower in cross and vertical section. How many parts 
are there in each set? Can you tell readily 
the number of stamens? When the indi- 
viduals of any set or cycle of organs are too 
numerous to be easily counted, like the 
stamens of the apple, pear, and peach, or 
the petals of the water lily, they are said 
to be indefinite. Itis very seldom that per- 
fect symmetry is found in all parts of the ; 
flower. The stamens and pistil, in partic- ghee ear e is 
ular, show a great tendency to variation, so ™ond blossom with 
é petals removed, show- 
that the numerical plan is generally deter- ing the perigynous 
mined by the calyx and corolla. Where the ®722ement- 
parts are in fives, as in the pear, quince, and wild rose, the 
flower is said to be pentamerous, or in sets of five. This is the 
prevailing number among dicotyls, though other orders are 
bd 
302 303 
Fics. 302-304.— Diagrams showing arrangement of parts with reference to the 
ovary: bd, receptacle; k, calyx; kr, corolla; st, stamens; fr, ovary; g, style; n, 
stigma; 302, perigynous; 303, hypogynous; 304, epigynous. 
not uncommon. In the mustard family (220) and other 
well-known species, the fourfold order prevails, while some 
of the saxifrages have their parts in twos, and the magnolia 
and the pawpaw have a threefold arrangement. 
