1 / 72

INFLORESCENCE

INFLORESCENCE. INFLORESCENCE (arrangement of flowers on floral axis). Racemose -main axis continues to grow,flowers are arranged laterally in an acropital manner. Cymose -main axis terminates in a flower having limited growth,flowers are borne in a basipetal manner. RACEMOSE. CYMOSE.

paynel
Download Presentation

INFLORESCENCE

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. INFLORESCENCE

  2. INFLORESCENCE(arrangement of flowers on floral axis) • Racemose-main axis continues to grow,flowers are arranged laterally in an acropital manner. • Cymose-main axis terminates in a flower having limited growth,flowers are borne in a basipetal manner.

  3. RACEMOSE

  4. CYMOSE

  5. CHARCTERSTICS OF FLOWER • Bisexual/unisexual • Actinomorphic/zygomorphic/asymmetric • Trimerous/ tetramerous/ pentamerous • Bracteate/ ebracteate • Hypogynous/perigynous/epigynous • Superior and inferior ovary.

  6. The flower is the reproductive unit in the angiosperms. • A typical flower has four different kinds of whorls arranged successively on the swollen end of the stalk or pedicel, called thalamus or receptacle. • In some flowers like lily, the calyx and corolla are not distinct and are termed as perianth..

  7. bisexual :When a flower has both androecium and gynoecium, • unisexual : A flower having either only stamens or only carpels .

  8. SYMMETRY: • When a flower can be divided into two equal radial halves in any radial plane passing through the centre, it is said to be actinomorphic, e.g., mustard, datura, chilli. • When it can be divided into two similar halves only in one particular vertical plane, it is zygomorphic, e.g., pea, gulmohur, bean, Cassia.

  9. when a flower can be divided into two equal radial halves in any radial plane passing through the center it is said to be actinomprphic.eg-musturd,chilli ACTINOMORPHIC

  10. ZYGOMORPHIC • When the flower can be divided into two similar halves only in one particular vertical plane it is called zygomorphic.eg-pea,gulmohur.

  11. A flower is asymmetric (irregular) if it cannot be divided into two similar halves by any vertical plane passing through the centre, as in canna. 

  12. A flower may be trimerous, tetramerous or pentamerous when the floral appendages are in multiple of 3, 4 or 5, respectively. • Flowers with bracts, reduced leaf found at the base of the pedicel, are called bracteate and those without bracts, ebracteate.

  13. TRIMEROUS FLOWER

  14. TETRAMEROUS , PENTAMEROUS

  15. BRACTEATE

  16. HYPOGYNOUS FLOWER : • The gynoecium occupies the highest position while the other parts are situated below it. • The ovary in such flowers is said to be superior, • e.g., mustard, china rose and brinjal.

  17. Figure 5.13 Position of floral parts on thalamus : (a) Hypogynous (b) and (c) Perigynous (d) Epigynous

  18. HYPOGYNOUS FLOWER

  19. PERIGYNOUS • Gynoecium is situated in the centre and other parts of the flower are located on the rim of the thalamus almost at the same level . • The ovary here is said to be half inferior, •  e.g., plum, rose, peach.

  20. EPIGYNOUS FLOWERS • The margin of thalamus grows upward enclosing the ovary completely and getting fused with it, the other parts of flower arise above the ovary. • The ovary is said to be inferior as in flowers of guava and cucumber, and the ray florets of sunflower.

  21. EPIGYNOUS

  22. PERIGYNOUS

  23. FLOWER

  24. PARTS OF A FLOWER • calyx-gamosepalous/polysepalous • corolla-gamopetalous/polypetalous

  25. Figure 5.13 Position of floral parts on thalamus : (a) Hypogynous (b) and (c) Perigynous (d) Epigynous

  26. CALYX • The calyx is the outermost whorl of a flower and the members are called sepals.

  27. GAMOSEPALOUS ND POLYSEPALOUS

  28. Corolla is composed of petals. petals are usually brightly colored to attract the insects for pollination. COROLLA

  29. if the petals are united then they are called gamopetalous.If the petals are not united they are called polypetalous.

  30. EPIPETALOUS

  31. EPIPHYLLUS

  32. AESTIVATION OF SEPAL & PETAL

  33. Aestivation: • The mode of arrangement of sepals or petals in floral bud with respect to the other members of the same whorl is known as aestivation. • Valvate: sepals or petals in a whorl just touch one another at the margin, without overlapping, Ex  Calotropis,  

  34. Twisted:one margin of the appendage overlaps that of the next one .Eg. china rose, lady’s finger and cotton,. • Imbricate: the margins of sepals or petals overlap one another but not in any particular direction .EgCassia and gulmohur,

  35. vexillary or papilionaceous :In pea and bean flowers, there are five petals, the largest (standard) overlaps the two lateral petals (wings) which in turn overlap the two smallest anterior petals (keel); this type of aestivation is known as .

  36. ANDROECIUM • Composed of stamens • Consists of filament & anther • Sterile stamen is called staminode. • Epipetalous-stamens attached to petals. • Epiphyllous-stamens attached to perianth. • Polyandrous-free stamens • Monadelphous-stamens united into one bundle. • Diadelphous-stamens united into two bundles. • polyadelphous-stamens united into more than two bundles.

  37. MONADELPHOUS,DIADELPHOUS

  38. SYNANDROUS

  39. GYNOECIUM • female reproductive part of flower. • consists of ovary , style , stigma • ovary bears one/ more ovules. • ovules attached to placenta. • apocarpous-more than one free carpel • syncarpous-fused carpels

  40. GYNOECIUM

  41. APOCARPOUS

  42. SYNCARPOUS

More Related