Seed-plants sentence example

seed-plants
  • Aquatic plants occur among seed plants but these are readaptations of land plants to an aquatic environment.

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  • The seed is a new structure characteristic of this group, which is therefore often referred to as the Seed-plants.

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  • More recently in Das Pflanzenreich the same author organized a series of complete monographs of the families of seed-plants.

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  • The aquatic habit of most of the species and the minute size of many of them are difficulties which do not exist in the case of most seed-plants.

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  • In modern botanical works the group is often known as the seed-plants (Spermatophyta).

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  • But there is considerable difference of opinion as to the relation between these cones and the more definite and elaborate structure known as the flower in the higher group of seed-plants--the Angiosperms - and it is to this more definite structure that we generally refer in using the term " flower."

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  • On the other hand, fern-like seed-plants, known as Pteridosperms, and Gymnosperms belonging almost entirely to families now extinct, were abundant, while the Pteridophyta attained a development exceeding anything that they can now show.

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  • A system of classification for the Phanerogams, or, as they are frequently now called, Spermatophyta (seed-plants), which has been much used in Great Britain and in America, is that of Bentham and Hooker, whose Genera Plantarum (1862-1883) is a descriptive account of all the genera of flowering plants, based on their careful examination.

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  • Between these two extremes is every conceivable gradation, embracing aquatic and terrestrial herbs, creeping, erect or climbing in habit, shrubs and trees, and representing a much greater variety than is to be found in the other subdivision of seed-plants, the Gymnosperms.

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