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FLOWER ARRANGEMENT ON FLORAL AXIS: INFLORESCENCE Presented by: Dr. Maninder Kaur Associate Professor, Botany Department, Government College for Girls,

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Presentation on theme: "FLOWER ARRANGEMENT ON FLORAL AXIS: INFLORESCENCE Presented by: Dr. Maninder Kaur Associate Professor, Botany Department, Government College for Girls,"— Presentation transcript:

1 FLOWER ARRANGEMENT ON FLORAL AXIS: INFLORESCENCE Presented by: Dr. Maninder Kaur Associate Professor, Botany Department, Government College for Girls, Sector-11, Chandigarh

2 INFLORESCENCE Many trees do not bear their flowers separately but in groups closely together. These groups of flowers and their associated stems are called inflorescences. The stem that bears a single flower or an inflorescence is called the peduncle. The peduncle of an inflorescence may have smaller stems called pedicels The pedicels may bear the flowers as in the example on the left, or they may have further small branches which bear the flowers, in which case the inflorescence is said to be compound. A diagram of a generalised inflorescence

3 Types of Inflorescence Racemose Type: The main axis grows indefinitely giving rise to younger flowers in an acropetal order. Racemose Type Cymose Type: The apical bud is a flower. The younger flowers are borne below it, in a basipetal manner. Cymose Type Special Inflorescence Special Inflorescence

4 Pedicillate Flowers Rachis Elongated Racemose Inflorescence Rachis Shortened Rachis Suppressed Corymb Rachis Flattened Capitulum Umbel Sessile Flowers SpikeCatkin SpadixSpikelet Raceme Panicle

5 Raceme Spikelet Capitulum Umbel Corymb PanicleSpikeCatkinSpadix Rachis Elongated Pedicillate Flowers Sessile Flowers Rachis Shortened Rachis Suppressed Rachis Flattened

6 Cymose Inflorescence Dichasial Solitary Scorpoid Helicoid Monochasial Polychasial

7 Cymose Inflorescence Solitary cyme Polychasial cyme Dichasial cyme Monochasial cyme ScorpoidHelicoid

8 Special Inflorescence Cyathium Verticillaster Hypanthodium

9 Raceme Stalked flowers are borne acropetally on an elongated rachis. e.g. Mustard, Radish.

10 Alfalfa PANICLE Flowers borne not directly on the axis but on its branches. e.g. Alfalfa Panicle inflorescence of alfalfa

11 Compound Spike- Amaranthus spinosus Simple Spike- Achyranthes aspera SPIKE Like a raceme but flowers are without stalk.e.g. Achyranthes

12 Musa indica SPADIX Rachis is thick and fleshy and the flowers are covered by one or more spathy bracts e.g. Musa indica (banana)

13 Morus alba CATKIN Spike in which the axis is thin and weak. These are unisexual inflorescences and usually deciduous e.g. Morus alba (Mulberry) Carya texana

14 Triticum vulgare SPIKELET 1-5 flowers are present in a spikelet, which are subtended by lemma (br.), palea (brls.) and glumes e.g. Triticum vulgare (wheat)

15 Iberis amara CORYMB Axis not elongated. All the flowers are placed almost at the same level, the lower flowers having longer pedicels. e.g. Iberis amara (candy tuft)

16 Geranium Foeniculum vulgare UMBEL Axis is suppresed and the flowers usually have pedicels equal in length, forming a cluster e.g. Foeniculum vulgare (saunf)

17 CAPITATE The axis is suppressed and a large number of sessile flowers arise from it forming a globose structure e.g. Acacia, Mimosa Albizia julibrissin (Mimosa)

18 Helianthus annus CAPITULUM Rachis forms a flattened or convex receptacle on which the florets are arranged e.g. Helianthus annus (sunflower)

19 Hibiscus rosa sinensis SOLITARY Axillary bud forms a single flower e.g. Hibiscus rosa sinensis (shoe flower)

20 Heliotropium MONOCHASIAL CYME Main axis terminates in a flower and one lateral branch develops from its base also ending in a flower e.g. Heliotropium

21 Dianthus DICHASIAL CYME Two lateral branches develop on two sides of the terminal flower. Lateral branches may again branch e.g. Dianthus

22 Calotropis procera POLYCHASIAL CYME More than two branches develop on the two sides of the terminal flower e.g. Calotropis procera (Ak)

23 Euphorbia pulcherrima CYATHIUM Extremely reduced unisexual florets are placed on convex receptacle covered by a cup shaped green involucre. Central female flower is the biggest surrounded by a large number of male flowers e.g. Euphorbia pulcherrima (Poinsettia),

24 Ocimum sanctum VERTICILLASTER The opposite leaves at the nodes, bear dichasial cymes in their axils. The sessile flowers are clustered together appearing like a whorl around the stem e.g. Ocimum sanctum (tulsi)

25 Ficus HYPANTHODIUM Cup-shaped receptacle formed by the condensation of the rachis of closely placed cymes. The receptacle forms a vessel with a terminal opening and flowers inside it in cymose groups e.g. Ficus

26 Thank you


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