Angiosperms Fall 2011 - Phylum Anthophyta Angiosperms...

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Unformatted text preview: Phylum Anthophyta Angiosperms (Flowering Plants) Table 25-1 140 mya Angiosperms are most successful plants! Over 288,000 species 90% of all plants Major derived characters: flowers (with anthers and closed carpels) fruits double fertilization ovule with two integuments Parts of a flower In whorls or series Attached to shoot tip called a receptacle All are modified leaves; some bear sporangia so are sporophylls Four whorls: sepals, petals, stamens, pistils (pistils are composed of carpels) Fig. 30-7 Carpel Ovule Sepal Petal Stigma Style Ovary Stamen Anther Filament Sepals Outermost whorl Usually green Protect flower in bud On lily, sepals resemble petals, but the sepals are inserted below the petals and are slightly different in shape Fig. 30-7 Carpel Ovule Sepal Petal Stigma Style Ovary Stamen Anther Filament Petals Inserted above (or to the inside of) the sepals Usually colorful Attract pollinators May have nectar guides lines, dots, etc. that lead pollinator to nectar Nectar Guides on Petals Some nectar guides reflect or absorb UV light (Barth, 1991) If petals are fused together, count lobes to determine number of parts Sepals and petals are collectively called the perianth Fig. 30-7 Carpel Ovule Sepal Petal Stigma Style Ovary Stamen Anther Filament If petals and sepals are not readily distinguished, are called tepals Fig. 30-7 Carpel Ovule Sepal Petal Stigma Style Ovary Stamen Anther Filament Stamens Male parts Filament (stalk) and a sac-like anther Meiosis takes place in anthers, producing microspores that divide by mitosis to make pollen grains (male gametophyte) with two sperm Fig. 30-7 Carpel Ovule Sepal Petal Stigma Style Ovary Stamen Anther Filament Stamens may be of different heights Stamens may be fused to the petals Drawings by Bellamy Parks Jansen, from Tyrl et al., 2008 Fig. 30-7 Carpel Ovule Sepal Petal Stigma Style Ovary Stamen Anther Filament (one or more make up a pistil) Pistil(s) Female part(s) Parts of a pistil - ovary, style(s) and stigma(s) Carpels completely fused; two stigma lobes A pistil is composed of one to many carpels , each a modified leaf (all those shown are composed of two carpels) Separate stigmas...
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This note was uploaded on 02/04/2012 for the course BIO 1225 taught by Professor Caddell during the Fall '11 term at University of Central Oklahoma.

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Angiosperms Fall 2011 - Phylum Anthophyta Angiosperms...

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