calyx (group of sepals) of hibiscus flowers with no petals : (pix sanjiv shukla)

sepal calyx flower angiosperms flowering plant green function protection bud support petal bloom colour colorful brightly fused together scales teeth ridges structure protrude fruit perianth stamen morphology modified leaves corolla outer sterile whorl photosynthesis occurs slower rate stomata lower density gas exchange thorny dried live seed species bladderlike enclosure nature natural botany horticulture tepal inflorescence