[B] Variation in Floral Features

• Variable features of flowers:

  1. Coloration
  2. Odor
  3. Sexuality
  4. Floral Distribution
  5. Symmetry
  6. Position of Ovary
  7. Fusion
  8. Number of Floral Parts
  9. Type of Peduncle
• Flowers that have both stamens and pistils

  Perfect, bisexual, or hermaphroditic flowers
• Imperfect flowers

  • Staminate - androecium only, also called male flowers
  • Pistillate - gynoecium only, also called female flowers
• Identify the flowers sexuality (Ayo..)

  A) Perfect

  B) Imperfect, male, staminate

  C) Imperfect, female, pistillate

  
• Floral Distribution:

  1. Polygamous - perfect and imperfect flowers in the same plant
  2. Monoecious - staminate and pistillate on the same plant
  3. Dioecious - all staminate or all pistillate
• Plant species that has both monoecious and dioecious forms

  Sagittaria latifolia
• Symmetry:

  • Radial (actinomorphic) - equal identical halves along any plane down the central axis
  • Bilateral (zygomorphic) - divided equally only by median vertical line in one definite direction
• Position of the Ovary:

  • Hypogynous (superior) - ovary above the corolla, calyx, stamens
  • Perigynous - Similar to hypogynous, other floral parts are at the rim of the hypanthium
  • Epigynous (inferior) - ovary below calyx, corolla, stamens
• Identify positions of the ovary:

  A) Superior and hypogynous

  B) Superior and perigynous

  C) Half inferior

  D) inferior epigynous

  E) Inferior epigynous

  
• Fusion:

  1. Connation - similar parts are fused (petals fused)
  2. Adnation - dissimilar parts fused (petals and sepals fused)
• Number of Floral Parts:

  1. Dicots - multiples of 4 or 5
  2. Monocots - multiples of 3
• Type of Peduncle

  • Peduncle - One main stem holding the entire flower
  • Pedicels - Branches from the peduncle (flowers are called pedicillate)