bisexual flower; perfect flower
Botanical term for a flower that has both stamens and pistils. The gloss 'androgynous flower' is less common in modern botany; 'perfect flower' or 'bisexual flower' are standard.
Lilies are a typical example of bisexual flowers.
雌雄同株 (monoecious) refers to a plant with separate male and female flowers on the same individual, not a single flower with both organs.
Compound of 両性 (ryōsei, 'both sexes') + 花 (ka, 'flower'). The term is a straightforward Sino-Japanese coinage used in botany.