In botany|lang=en terms the difference between flower and lacinia

is that flower is (botany) a reproductive structure in angiosperms (flowering plants), often conspicuously colourful and typically including sepals, petals, and either or both stamens and/or a pistil while lacinia is (botany) a narrow, slender portion of the edge of a monophyllous calyx, or of any irregularly incised leaf.

As nouns the difference between flower and lacinia

is that flower is a colorful, conspicuous structure associated with angiosperms, frequently scented and attracting various insects, and which may or may not be used for sexual reproduction or flower can be something that flows, such as a river while lacinia is (botany) one of the narrow, jagged, irregular pieces or divisions which form a sort of fringe on the borders of the petals of some flowers.

As a verb flower

is to put forth blooms.