Presentation on theme: "Introduction to the Angiosperms Chapter 19. Angiosperms- Anthophyta Autotrophic, but parasitic and saprophytic representatives. Enclosure of ovules within."— Presentation transcript:
Introduction to the Angiosperms Chapter 19
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
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.
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.