plant with seeds borne in an ovary. Consists of two large groups: monocotyledons (grasses. palms. and related plants) and dicotyledons (most woody trees. shrubs. herbaceous plants. and related plants) (contrast with gymnosperm).

Merriam-Webster Online Dictionary
angiosperm (noun)
any of a class (Angiospermae) or division (Magnoliophyta) of vascular plants (as magnolias, grasses, oaks, roses, and daisies) that have the ovules and seeds enclosed in an ovary, form the embryo and endosperm by double fertilization, and typically have each flower surrounded by a perianth composed of two sets of floral envelopes comprising the calyx and corolla - called also flowering plant
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angiosperm (Wikipedia)

Flowering plants
Temporal range: Early Cretaceous – present, 130–0 Ma
Possible Early Jurassic record
Flower poster 2.jpg
Diversity of angiosperms
Scientific classification e
Kingdom: Plantae
Clade: Spermatophytes
Clade: Angiosperms
Groups (APG IV)

†Nanjinganthus?

Basal angiosperms

Core angiosperms

Synonyms

The flowering plants, also known as angiosperms, Angiospermae or Magnoliophyta, are the most diverse group of land plants, with 64 orders, 416 families, approximately 13,000 known genera and 300,000 known species. Like gymnosperms, angiosperms are seed-producing plants. However, they are distinguished from gymnosperms by characteristics including flowers, endosperm within the seeds, and the production of fruits that contain the seeds. Etymologically, angiosperm means a plant that produces seeds within an enclosure; in other words, a fruiting plant. The term comes from the Greek words angeion ("case" or "casing") and sperma ("seed").

The ancestors of flowering plants diverged from gymnosperms in the Triassic Period, 245 to 202 million years ago (mya), and the first flowering plants are known from 160 mya. They diversified extensively during the Early Cretaceous, became widespread by 120 mya, and replaced conifers as the dominant trees from 100 to 60 mya.

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