Flowers

1
Flowers

• Numerical plan and forms
• Original by Libby Astrachan
• Modified by Georgia Agriculture Education
  Curriculum Office - July 2004

2
Numerical parts of flowers

• Most flowers have a definite number of parts.
• The best place to check is the petals or the
  sepals.

3
Monocots

• Monocots have parts in 3s or multiples of 3s

4
Dicots

• Dicots have parts in 4s or 5s
• or multiples of 4s or 5s

5
Forms of Flowers

• Flowers are presented on stems in 2 different
  ways solitary, or as inflorescences

6
Solitary flowers

• Single flower on a stem

7
Inflorescence

• Clustered flowers
• Different types of inflorescences are based on
  how the stems are branched

8
Peduncle

• The main stem of an inflorescence

9
Pedicels

• Branch off the peduncle

10
Inflorescences can be classified based on the
order of flowering of the peduncle
11
Determinate Flowers

• Begin flowering from the top down (or out)

12
Indeterminate Flowers

• Begin flowering from the bottom (the base) and
  progress upward or inward

13
Inflorescence types
14
Spike

• Elongated inflorescence
• Central axis
• Sessile flowers (no pedicels)

15
Raceme

• Elongated inflorescence
• Central axis
• Simple pedicels of more or less equal length

16
Panicle

• Elongated in florescence
• Central axis
• Branches that are themselves branched

17
Corymb

• Flat-topped
• Main vertical axis
• Pedicels or branches unequal length

18
Umbel

• Several branches arising from a common point
• Simple umbel has flowers with single pedicels
• Compound umbel has secondary branching

19
Spadix

• Spike with a thickened, fleshy axis, enveloped by
  a showy bract
• Bract is called a spathe

20
Catkin

• Unisexual flowers with petals falling as a unit
• Wind pollinated

21
Head or Composite

• Rounded of flat-topped cluster of sessile flowers

22
Head or Composite

• Many flowers have disc flowers, circled by ray
  flowers