angiosperm


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angiosperm

(ăn`jēəspûrm'), term denoting seed plants in which the ovules, or young seeds, are enclosed within the ovary (that part of the pistil specialized for seed production), in contrast to the gymnosperms, in which the seeds are not enclosed within an ovary. The angiosperms constitute the division MagnoliophytaMagnoliophyta
, division of the plant kingdom consisting of those organisms commonly called the flowering plants, or angiosperms. The angiosperms have leaves, stems, and roots, and vascular, or conducting, tissue (xylem and phloem).
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 and include all agricultural crops (including the cereal grains and other grasses), all garden flowers and most horticultural plants, all the common broad-leaved shrubs and trees, and all the usual field, garden, and roadside weeds. The angiosperms are the most economically important group of all plants.

angiosperm

[′an·jē·ō‚spərm]
(botany)
The common name for members of the plant division Magnoliophyta.

angiosperm

A class of seed plants (having seeds enclosed in an ovary) which includes most of the world’s flowering plants.
References in periodicals archive ?
Having made this discovery, the team now wants to understand whether angiosperms are either monophyletic -- which would mean Nanjinganthus represents a stem group giving rise to all later species -- or polyphyletic, whereby Nanjinganthus represents an evolutionary dead end and has little to do with many later species.
Indeed, we can see this macroscopically in samples of dried angiosperm woods, where the surfaces of shrinkage cracks run parallel to rays ("checking").
Baum, "Establishment of polarity in angiosperm lateral organs," Trends in Genetics, vol.
This study also indicated that deforestation and poplar industry along habitat loss, over grazing, unawareness, annual fire practices and exploitation of medicinal plants were the major threats to the angiosperms of Rawalakot.
About 40-70% of angiosperms are considered to be polyploids [14].
Among plants, particularly angiosperms, the selection of a standard barcode is more difficult mainly due to the evolutionary trends of each of the three plant genomes.
A revised system of classification of the angiosperms. Botanical Journal of the Linnean Society, v.
Evolutionary genomic analyses of ferns reveal that high chromosome number are a product of high retention and fewer rounds of polyploidy relative to Angiosperms. Amer.
However, if allowance is made for ash in the 1997 FH material, none of the measured P fractions differed appreciably from those in samples from the angiosperm conifer forests, in which net N[O.sub.3.sup.-] -N production readily occurred (Table 7; Parfitt et al.
Angiosperms have evolved a multitude of external dispersal adaptations, including wind (anemochory), water (hydrochory), animal (zoochory), and self-dispersal (autochory; Fenner, 1985).
The fossil record also suggests that by 75 million years ago many flowering plant families were well established, and some of these are common in today's angiosperm flora including; birch (Betula), alder (Alnus), oak (Quercus), elm (Ulmus), sycamore (Platnus), basswood (Tilia), chestnut (Castanea), maple (Acer), beech (Fagus), sweet gun (Liquidamber), hickory (Carya), and Magnolia.
Despite being a very important ethno-medicinal angiosperm species, due to many factors, it has now been restricted to small pockets of the Kashmir Himalaya.