angiosperm

/angiosperm

angiosperm

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
angiosperm
angiosperm (Wikipedia)
Flowering plants
Temporal range: Early Cretaceous - recent, 120–0 Ma
Sweetbay Magnolia Magnolia virginiana Flower Closeup 2242px.jpg
Magnolia virginiana, sweet bay
Scientific classification
Kingdom: Plantae
Subkingdom: Embryophyta
(unranked): Spermatophyta
(unranked): Angiosperms
Groups

According to APG IV (2016):


Traditional groups:

Synonyms

The flowering plants (angiosperms), also known as Angiospermae or Magnoliophyta, are the most diverse group of land plants, with 416 families, approx. 13,164 known genera and a total of c. 295,383 known species. Like gymnosperms, angiosperms are seed-producing plants; 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 "angiosperm" comes from the Greek composite word (angeion, "case" or "casing", and sperma, "seed") meaning "enclosed seeds", after the enclosed condition of the seeds.

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

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By |2016-12-16T18:24:16+08:00December 16th, 2016|0 Comments

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