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Angiosperms have an unusual thing called double fertilization. When the sperm nuclei reach the female gametophyte, one sperm nucleus and the egg cell unite to form a new 2n zygote (which grows into an embryo).
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biology.clc.uc.edu/courses/bio106/angio.htm
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Flowering plant - Wikipedia, the free encyclopedia
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The flowering plants or angiosperms ( Angiospermae or Magnoliophyta ) are the most diverse group of land plants. The flowering plants and the gymnosperms are the only extant groups of seed pla...
en.wikipedia.org/wiki/Flowering_plant
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Angiosperms are flowering plants. Angiosperms are the biggest group in the plant kingdom. They have true roots, stems, leaves and flowers. They also have seeds.The seeds are formed when an egg or ovule is fertilized by pollen in the ovary.
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www.mcwdn.org/Plants/Angiosperm.html
www.mcwdn.org/Plants/Angiosperm.html
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The angiosperms, or flowering plants, are one of the major groups of extant seed plants and arguably the most diverse major extant plant group on the planet, with at least 260,000 living species classified in 453 families (Judd et al., 2002;
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tolweb.org/tree?group=Angiosperms&contgroup=Spermatopsi...
tolweb.org/tree?group=Angiosperms&contgroup=Spermatopsida
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In most angiosperms, the flowers are perfect: each has both microsporangia and megasporangia. ... Some angiosperms are imperfect, having either microsporangia or megasporangia but not both. ... 2 synergid cells. In several (perhaps all) angiosperms, they secrete an attractant that guides the pollen tube through the micropyle...
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users.rcn.com/jkimball.ma.ultranet/BiologyPages/A/Angio...
users.rcn.com/jkimball.ma.ultranet/BiologyPages/A/Angiosperm.html
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The focus of this site is on angiosperms, although treatments of gymnosperm groups were added in 2005. Emphasis is placed on plant families because they are the groups - admittedly partly arbitrary as to circumscription, but now for the most part monophyletic - around which many of us organize our understanding of...
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www.mobot.org/MOBOT/Research/APweb/welcome.html
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Even in this century some plants called paleoherbs have left problems for taxonomy of angiosperms. These plants have a mix of characters which do not occur together in most other flowering plants.
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www.ucmp.berkeley.edu/glossary/gloss8/monocotdicot.html
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Seeds; For the lower vascular plants the important evolutionary development was in the water and food conducting tissues of the sporophyte. As we move on through the The free living gametophyte is a vulnerable phase of the life cycle. ... Already in the coal-measure forests there were plants that reproduced by seeds.
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www.hcs.ohio-state.edu/hcs300/gymno.htm
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The angiosperms, being seed plants, exhibit a life cycle that is in many respects similar to that found in gymnosperms, but there are also significant differences. The gametophytes of angiosperms are much reduced in size and cell number.
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www.umanitoba.ca/Biology/lab8/biolab8_5.html
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[ăńjē-ə-spûrḿ]
