Practice question

Perianth segments termed tepals when calyx corolla differentiation absent, showing similar pigmentation, size and texture throughout, often both petaloid or sepaloid without clear distinction. Condition common in monocots Liliaceae where outer whorl not green sepaloid but showy, termed petaloid tepals, or in basal angiosperms like tulip, Magnolia where gradual transition from bracts to perianth evident morphologically. Sepals and petals indistinct genetically due to overlapping B-class MADS-box gene expression domain expansion. Presence only petals still corolla, only sepals calyx, absence achlamydeous, whereas tepal concept indicates undifferentiated perianth evolutionarily intermediate.