Kalmar "gynostegium" kalma ce ta ilmin halitta wacce ke nufin wani tsari a wasu furanni inda ake hada sassan haihuwa na namiji da na mace zuwa raka'a guda. Musamman, shine kalmar gama gari don gaurayawan stamens da salo a cikin furannin dangin Asclepiadaceae (wanda kuma aka sani da dangin milkweed). Gynostegium a cikin waɗannan furanni wani tsari ne na musamman kuma mai rikitarwa wanda ya keɓanta ga wannan iyali, kuma yana taka muhimmiyar rawa wajen yin pollination.