The document discusses the botanical characteristics of Ricinus communis, detailing its floral structure, symmetry, and reproductive features. It highlights the male and female flowers, their arrangement, and the significance of various morphological terms such as bracteate, actinomorphic, and monoecious. Additionally, the document mentions the economic importance of various species in the Euphorbiaceae family.

1. Family:Euphorbiaceae
Species:Ricinus communis
PRESENTATION BY:
DEEPANSHU KUMAR YADAV
BOTANY VTH SEMESTER

2. Inflorescence
Compound raceme - Male
flowers are seen below and female
flowers near the apex.

3. Male Flower
• Bracteate
• Ebracteolate
• Pedicellate
• Actinomorphic
• Monoecious
• Incomplete flower

4. Floral Diagram

5. Floral Diagram
Mother axis
Bract
Ebracteole

6. Bracteate -Bracts are leaf like structure at whose axils the
flowers are borne.
Ebracteate - If a bract is not present.

7. Bracteole - It is a small leaf-like structure/
secondary bract present on the stalk / pedicel.

8. Actinomorphic Symmetry

9. Pedicellate
 A flower which bears a stalk or
pedicel is called as a pedicellate
flower e.g. Hibiscus, Rose.
A flower which is borne
directly on the stem is called
to be a sessile flower. It is
devoid of a stalk.
Sessile flower

10. Unisexual Flower
Monoecious- When both male
and female flower are present
on the same plant.

11. Perianth
• Tepals 5 (that is not clearly differentiated into petals and sepals)
• Arranged in single whorl (flower is cyclic)
• Gamophyllous (jointed whorl)
• Valvate Aestivation
(perianth is the sterile parts of a flower)

12. Aestivation
 Floral leaves in a whorl may just touch one
another at the margins without overlapping
Aestivation is the positional arrangement of the parts
of a flower within a flower.
Valvate Aestivation

13. Androecium
• Stamens - 5
• Polyadelphous - When the filaments of the stamens are
united to form several bundles
• Dithecous Anther - Two lobes which are attached at the
back by connective
• Basifixed - an anther is attached from its base to the
filament
• Introrse - Anther dehiscence takes place toward
the centre of the flower.

14. Polyadelphous
 The androecium of a flower can show varying degree
of fusion between filaments and anthers. When the
filaments of the stamens are united to form several
bundles, the condition is called polyadelphous. It is
seen in lemon.

15. Female Flower
• Bracteate
• Ebracteolate
• Actinomorphic
• Monoecious
• Incomplete
• Hypogynous.

16. Floral Diagram
Mother Axis
Bract
Ebracteole

17. Bracteate -Bracts are leaf like structure at whose axils the
flowers are borne.
Ebracteate - If a bract is not present.

18. Bracteole - It is a small leaf-like structure/
secondary bract present on the stalk / pedicel.

19. Actinomorphic Symmetry

20. Pedicellate
 A flower which bears a stalk or
pedicel is called as a pedicellate
flower e.g. Hibiscus, Rose.
A flower which is borne
directly on the stem is called
to be a sessile flower. It is
devoid of a stalk.
Sessile flower

21. Unisexual Flower
Monoecious- When both male
and female flower are present
on the same plant.

22. Perianth
• Calyx -3 to few or more
• Caducous - falling of calyx before usual time
• Spathaceous
• Valvate Aestivation.
(perianth is the sterile parts of a flower)

23. Spathaceous
• a large bract
• often coloured
• that encloses the inflorescence

24. Aestivation
 Floral leaves in a whorl may just touch one
another at the margins without overlapping
Aestivation is the positional arrangement of the parts
of a flower within a flower.
Valvate Aestivation

25. Gynoecium
• 3 carpels (tricarpellary)
• Syncarpous (capels united)
• Ovary superior
• Trilocular with spiny outgrowths,
• Axile placentation
• single large ovule in each locule
• three styles, three bifid stigmas.

26. Ovary superior
An ovary attached to the
receptacle above the attachment
of other floralparts.
Trilocular
In this type, an ovary consists
of a single chamber

27. Axile Placentation
ovules are borne at or around
the center of a compound ovary
on an axis formed from joined
septa.

28. POLLINATION
• Entomophilous, i.e., through the agency
of insects. In many species the leaves and
bractsbecome coloured and showy to
attract the insects
• Cross- pollination takes place
• Anemophily is also found. through
wind.

29. ECONOMIC IMPORTANCE

30. Emblica officinalis Manihot esculenta Sauropus androgynus

31. Croton tiglium Ricinus communis Jatropha curcas

33. Jatropha gossypifolia
Phyllanyhus amarus
Croton tiglium
Ricinus communis

34. Mallotus philippensis Jatropha curcas

35. Acalypha ciliata Acalypha hispida
Codiaeum variegatum
Croton tiglium
Euphorbia antiquorum E.pulcherrima
E. tirucalli