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Introduction to the Angiosperms

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Presentation on theme: "Introduction to the Angiosperms"— Presentation transcript:

1 Introduction to the Angiosperms
Chapter 19

2 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

3 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.


5 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.




9 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.

10 Epigyny in Malus (apple) flower

11 Mature Anther with 4 Microsporangia

12 Mature Embryo Sac- 8 nuclei, 7 celled structure

13 Double Fertilization



16 Endosperm- tissue that contains
stored food that is digested by the sporophyte before or after maturation of the seed.




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