The four flowers sketched below with supplementary drawings of their
separate parts, give only a small sample of the infinite structural
variety found among flowering plants.
[Illustration: A Yucca, illustrating features which are found in
several other lilies.]
perianth segment
stigma
anther
style
ovary
pedical
stem
Detail of stamen
pollen
anther
filament
[Illustration: A Buttercup. This particular one has showy sepals but
no petals.]
group of styles
sepal
group of
stamens
ovary
pedical
single sepal
Detail of stamen
[Illustration: A Penstemon. Here a calyx is present formed of 5
sepals united at their base, the petal parts are fully united into a
tubular corolla terminating at its throat in 5 unequal lobes.]
lobe of corolla
sterile stamen
anther
stigma
style
sepal
ovary
calyx
pedicel
Details
beard
filament
anther
filament
[Illustration: A Composite flower head, made up of numerous complete
and separate flowers, enclosed at their bases in an involucre made
up of many overlapping bracts.]
(right half cut away and all other florets removed)
bracts of involucre
tubular floret
receptacle
ray floret
stigma
style
stamen
corolla tube
ovary
receptacle