FLOWER FORMS
Reading edition
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.
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
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
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
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
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