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Introduction to the Angiosperms
Chapter 19
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Angiosperms- Anthophyta• Autotrophic, but parasitic and
saprophytic representatives.• Enclosure of ovules within carpels.• Ovule- the structure in seed plants
that contains the female gametophyte with egg cell; including nucellus and integuments.
• Presence of endosperm in seeds.• Flower present with stamens
(microsporophylls) & carpels (megasporophylls).
• Species- 300,000-450,000
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Class Monocotyledonae- monocots
• Flower parts- 3s.• Pollen- monoaperturate.• Cotyledons- 1.• Leaf venation- parallel.• 1° vascular bundles in
stem- complex.• 2° growth without vascular
cambium.• Examples- grasses, lilies, irises,
orchids, cattails, palms.
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Class Eudicotyledonae- dicots
• Flower parts- 4s & 5s.• Pollen- triaperturate.• Cotyledons- 2.• Leaf venation- netlike.• 1° vascular bundles in
stem- ring.• 2° growth with
vascular cambium.• Examples- trees,
shrubs, herbs.
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Ovary Position• Hypogynous- whorls attached below the ovary.• Perigynous- stamens and petals adnate to the calyx,
forming a tube (hypanthium) at the base of the ovary.• Epigynous- whorls attached above the ovary.
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Epigyny in Malus (apple) flower
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Mature Anther with 4 Microsporangia
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Mature Embryo Sac- 8 nuclei, 7 celled structure
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Double Fertilization
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Endosperm- tissue that containsstored food that is digested by the sporophyte before or aftermaturation of the seed.
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