Topic #4: Perianth Merosity

• Perianth Merosity - Refers to the number of floral parts per whorl.
• Isomerous

  • Having the same number of members in different whorls.
• Isomerous

  • For example, 5 Petals and 5 Sepals.
• Anisomerous

  • Having a different number of of members in different whorls.
• Anisomerous

  • For example, 2 Petals and 5 Sepals.
• Anisomerous

  • Bimerous - whorl with 2 members.
• Anisomerous

  • Trimerous - whorl with 3 members.
• Anisomerous

  • Pentamerous - whorl with 5 members.
• Achlamydeous

  • Lacking a Perianth altogether.
• Achlamydeous

  • Perianth - the outermost, non-reproductive group of modified leaves of a flower (Corolla, Calyx, Petal, Sepal, Tepal)
• Achlamydeous

  • Asepalous - lacking Sepal or Calyx
• Achlamydeous

  • Apetalous - lacking Petal