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Definition: spermatophyte from Philip's Encyclopedia

Seed-bearing plant, including most trees, shrubs, and herbaceous plants. It has a stem, leaves, roots, and a well-developed vascular system. The dominant generation is the sporophyte. Divisions are the Angiospermophyta (flowering plants), Coniferophyta (conifers), Ginkgophyta (ginkgo or maidenhair tree), Cycadophyta (cycads), and Gnetophyta (a group of cone-bearing desert plants).


Summary Article: seed plant from The Hutchinson Unabridged Encyclopedia with Atlas and Weather Guide

Any seed-bearing plant; also known as a spermatophyte.

The seed plants are subdivided into two classes: the angiosperms, or flowering plants, and the gymnosperms, principally the cycads and conifers.

Together, they comprise the major types of vegetation found on land.

Angiosperms are the largest, most advanced, and most successful group of plants, occupying a highly diverse range of habitats. There are estimated to be about 250,000 different species. Gymnosperms differ from angiosperms in their ovules which are borne unprotected (not within an ovary) on the scales of their cones.

The arrangement of the reproductive organs, and their more simplified internal tissue structure, also distinguishes them from the flowering plants. In contrast to the gymnosperms, the ovules of angiosperms are enclosed within an ovary and many species have developed highly specialized reproductive structures associated with pollination by insects, birds, or bats.

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