5. morphology of flowering parts (inflorescence)

Class XI Unit II

1. Chapter-5
Morphology of flowering
plants ( infloresCenCe)
Presented by
B.Prabhakar
Principal
JNV. Panchmahal (Guj)

2. Parts of the plant
•1. Roots
•2. Stem
•3. Leaves
•4. Flower

3. •Specify the part of the plant
which is useful for the
sexual reproduction
•Ans. Flower

4. •Is the flower single in all the
plants
•Ans. No
•Then how are flowers arranged
•Ans. They are arranged singly
or in groups

5. •The technical name for the cluster of
flowers is called
•Inflorescence

6. Structure of the inflorescence
•Stalk of the inflorescence is called
Peduncle
•Stalk of the flower is called Pedicel

7. •The flower
which has stalk
is said to be
Pedicillate
flower
•The flower
without stalk is
said to be
sessile flower
Pedicillate & Sessile flowers

8. Types of Inflorescence
•1. Racemose inflorescence
•2. Cymose inflorescence

9. Racemose inflorescence
•1. The growth of
the inflorescence
axis is unlimited
•2. Flowers are
arranged in
Acropetal
manner
Flowers may be
sessile or
pedicillate

10. Types of racemose inflorescence
•1. Raceme
•2. Spike
•3. Spadix
•4. corymb
•5. Umbel
•6. Capitulum

11. Raceme
•1. Flowers have pedicels
•2. Flowers are arranged in Acropetal
manner
Flower

13. Acropetal arrangement
•Older flowers are
present at the
base& Younger
flowers are
present at the
top

14. Ex-
Mustard

15. Spike
•1. Flowers are
without pedicels
•2. Flowers are
arranged in
acropetal
manner
Flower

18. Spadix
•If the spike is covered by
spathe , it is called Spadix
Ex –
Banana
Coconut

19. Corymb
•Flowers have
pedicels
•All flowers brought
to the same place
though they originate
from the different
places
•Pedicels are in
different lengths
Pedicel

21. Umbel
•Flowers
originate from
the same place
& they reach to
the same level

23. Head inflorescence
A head (capitulum) is
a short dense spike
in which the flowers
are borne directly on
a broad, flat
peduncle, giving the
inflorescence the
appearance of a
single flower

24. Ex – Sun flower, Chrysanthemum, Marigold

27. Structure of Head inflorescence
•It has two
types of
florets.
•1. Ray
florets
•2. Disc
florets

30. Ray Floret
Ray florets are the
female florets
They are said to be
Pistillateflowers
They have only
Gynoecium
Androecium is
absent

31. Disc florets are bisexual florets
They have both Stamens & pistil

32. Racemose inflorescence

38. Cymose inflorescence
•The growth of the inflorescence axis is
limited
•Flowers are arranged in basipetal
manner

39. Basipetal arrangement
•Older flowers are present at the top ,
younger flowers are present at the base

40. Types of cymose inflorescence
•1. Uniparous or Monochasial
•2. Biparous or Dichasial
•3. Multiparous Polychasial

41. 1. Uniparous or Monochasial
cyme
In this type of
inflorescence, the
peduncle ends in a
flower. Subsequently
one branch of the
peduncle develops at a
lower level and ends in a
flower. This type of
branching is repeated.

44. Uniparous cyme
What is the difference between
these two

45. If the branches
are produced
on the same
side, the
inflorescence
is said to be a
monochasial
helicoid cyme.
e.g. Hamelia,
Drosera.

46. If the branches are produced alternately in
a zigzag manner, the inflorescence is called
a monochasial scorpioid cyme. e.g.
Heliotropium.

47. Biparous cyme
In this type of cymose inflorescence, the
peduncle produces a flower at its tip,
subsequently the peduncle produces two
branches simultaneously at a lower level.
They also end in flowers. This type of
branching is repeated.

50. Polychasial cyme
•In this type of inflorescence the main
axis ends in a flower. Subsequently
the peduncle produces many
branches and each branch ends in a
flower.

51. Ex- Calotropis

52. Identify the following
inflorescences

53. Identify the following inflorescences

54. What do you call this inflorescence