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Flowers and Fruit PowerPoint PPT Presentation

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Flowers and Fruit. Flower Structure. Generalized flowers - 2 outer sets of sterile parts, 2 inner sets of fertile parts Outer sterile part - sepals, collectively the calyx - may do photosynthesis, protect flower, usually like leaves in texture, protect bud - form outer covering of bud

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Flowers and Fruit

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Flowers and Fruit

Flower Structure

  • Generalized flowers - 2 outer sets of sterile parts, 2 inner sets of fertile parts

  • Outer sterile part - sepals, collectively the calyx - may do photosynthesis, protect flower, usually like leaves in texture, protect bud - form outer covering of bud

  • Next sterile part - petals - not like leaves in texture, usually not green, collectively called corolla - petalloid - petal like in appearance

  • Both sepals and petals can be fused - so sepals joined together, petals joined together

  • Perianth - calyx and corolla together - used when the two cannot be distinguished - sometimes sepals and petals are called tepals for perianth if very similar in appearance – like in Tulips

  • If only one set of sterile parts, they are always called sepals; sometimes whole perianth is missing

  • First fertile parts - stamens - male – androecium - Can be sterile and modified to look like petals

  • Innermost fertile parts - pistils, female - gynoecium

Yellow rose – many “petals” are actually modified

sterile “petalloid” stamens

Carpels and Ovaries

  • Flowering plants always have enclosed ovary wrapped in a carpel - nonflowering plants don't - this is the vessel of the angiosperm

  • Carpel is highly modified leaf - a simple pistil is one ovary

  • Pistil may be made up of one carpel or several fused carpels

  • Often the bottom part called the ovary, with stigma at top to receive pollen, style connects them - fused carpels may have separate style and stigma or they may all be fused

Helleborus – five separate carpels

Malus – crab apple – typical flower structure

Plant Sexuality

  • Monoecious - separate flowers for male and female both on one plant - corn

  • Dioecious - male and female plants are separate - separate sexes - gingko

  • Perfect flower - flower has stamens and carpels – bisexual flowers

  • Imperfect flower - lacks either stamens or carpels - will be staminate or carpellate (pistillate)

  • Complete - has sepals, petals, stamens and carpels

  • Incomplete - lacking one of the 4 main flower parts

Complete and Incomplete Flowers

Jatropha – monoecious but insect pollinated

Female left, male right

Dioecious - Holly

Female flower Male flower Berries on female

Inflorescence terms

  • Often flowers, especially small flowers, are gathered into a structure known as an inflorescence – an aggregation of flowers on a single flowering branch

  • bract - more or less modified leaf that subtends flower or flower groups - bract can look like normal leaf

  • bract can also look like petal - petalous - dogwoods have big white "petals" that are really petaloid bracts

  • peduncle - stalk of cluster of flowers

  • pedicel - stalk of individual flower

  • petiole - leaf stalk

Dogwood with petalloid leafy bracts

Types of Inflorescence

1. indeterminant - youngest flower at apex - in theory could produce flowers forever - some may by fruiting while apex still flowering - include - racemes, panicle, spike, corymb, head, umbel, catkin

2. determinant - oldest flowers at apex - moving down younger flowers - cyme, scorpiod cyme




Panicum - switchgrass

Spike – prairie blazing star



Wild parsnip Queen Anne’s Lace

Sunflower –

Composite head



Alder catkin

Scorpoid Cyme


Skunk cabbage inflorescence – a spathe and spadix

Pollination syndromes

among the phloxes

Magnolia – beetle pollinated


covered with


Scotch broom – bee pollinated



beebalm –

Monarda sp.

With visible lightwith UV light

Nectar guides for honeybees

Cyrtid fly


a composite

Caralluma – carrion fly pollinated

Erysimum – butterfly pollinated

Episcia – moth pollinated

Hummingbird pollination

Ipomopsis aggregata – hummingbird pollinated

Greater double-collared sunbird

Proteus – pollinated by perching birds

Bat Pollination

Box elder – wind pollinated – female left, male right

Wild oats –

Whole plant

Wild oat flower – close up

Fruit Types

  • A fruit may be defined as a matured ovary

  • There are two basic fruit types – dry or fleshy. These types arise from the development of the pericarp

  • The pericarp may become dry and these form dry fruits

  • The pericarp may also become soft, thick and fleshy – and these form fleshy fruits

Apples and Pears




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