The seeds are enclosed in a carpel. There are approximately 385 families and 215,000 species. Angiosperms fall into 2 classes:
DICOTS: Generally with 2 cotyledons; leaf venation is either pinnate or palmate, and the stem vascular bundles form a ring around a central pith.
MONOCOTS: Generally with one cotyledon; parallel leaf venation, and vascular bundles distributed throughout the stem cross-section.
|