38 
it tapers is called tne style, and the receptive spot which receives 
the pollen is the stigma. 
=xceptions to this "ideal" floral plan are frequent. For 
example, a flower may consist either of stamens or of pistil only, as 
in the willow; or may consist of stamens and pistil only, as in the 
grasses; or may consist of calyx and stamens and of calyx and pistil 
a9 in Amaranthus; or may have oniy the corolla wanting as in some maples. 
In certain genera there is little or no difference between the calyx and 
corolla, as in Eriogonum, or in Lilium. 
The calyx is usually green and consists of usually five 
parts (sometimes 3-6 or more). These parts, the sepals, may be com- 
pletely separate and distinct, or may be variously united to forma 
bell-shaped or tubular cup. The corolla is usually colored or white, 
more conspicuous and larger than the calyx. Its parts, the petals, 
may also te free or may be joined together, either partly, as in 
Phacelia, or wholly, as in the morning glory. When joined together, 
the petals may take the shape either of a sancer, as in Solanum, or 
@ 
. Eitner the calyx or the corolla or both 
may form @ tube as in Gili 
may be irregular in the sense that a single plane only will divide 
them into two similar halves, as in the vea, or in the Indian paint 
brush, Castilleia. In this case the calyx or corolla is said to be 
zygzomorvhic. In flowers with tubular corollas the stamens are com- 
monly attached te the wall of the corolla tube. 
The stamens my be either numerous and indefinite in number, 
te , 4 : a ft ’ + » 1 x L +e 
ag in the buttercud, or reWw, in which case they are senerally 5, 6 ox 
