noun
center of a flower; pistils and stamens
Botanical term referring to the reproductive parts of a flower, including both pistils and stamens. Not an everyday word; used in scientific or descriptive contexts.
花蕊を顕微鏡で観察した。
I observed the flower's pistils and stamens under a microscope.
雄蕊 specifically means stamen, the male reproductive part, whereas 花蕊 is a collective term for both pistils and stamens.
Compound of 花 (flower) and 蕊 (pistil/stamen). The reading かずい is the on'yomi for both characters.