  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.
A Buttercup. This particular one has showy sepals but no petals.
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.
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.
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