FLOWER FORMS
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