"While teaching about parts of the flower, have students fill in the graph below. For the "is like" column, have students transcribe the analogies the came up with in their opening exercise, for instance... a stigma is like glue because they are both sticky."
"In describing the flower-the designation for the grouping of the corolla, calyx, ... of the plant in relation to the human-a plant's "stigma" is like a woman's labia"
The linked paragraph is worth a look.
"The stigma is like a mouth that takes in the pollen."
"The stigma is like an upside down umbrella and forms the floor upon which the pollinator walks when it enters the flower. Insects bringing pollen from other pitcher-plants deposit it on the sticky floor of the stigma as they bumble about inside the flower, thus cross-pollinating the plant."
METAMIA is a free database of analogy and metaphor. Anyone can contribute or search. The subject matter can be anything. Science is popular, but poetry is encouraged. The goal is to integrate our fluid muses with the stark literalism of a relational database. Metamia is like a girdle for your muses, a cognitive girdle.