The flowering plants, or angiosperms (Greek angio, vessel + sperm, seed; i.e., seeds enclosed by
a vessel), variously named Angiospermae, Magnoliophyta, or Anthophyta, are a monophyletic
group currently thought to be the sister group to the gymnosperms. Angiosperms are by far the
most numerous, diverse, and “successful” extant plant group, containing well over 95% of all
land plant species alive today. Flowering plants grow in virtually every habitable region and are
dominant in some aquatic and most terrestrial ecosystems, the notable exception to the latter
being coniferous forests. Angiosperms comprise the great bulk of our economically important
plants, including our most valuable food crops.
What is an angiosperm? An angiosperm is a plant that produces flowers. The angiosperms, also
identified as the flowering plants, belong to one of the vital groups of plants having seeds. The
word angiosperm has been derived from a couple of Greek words where angeion stands for
“vessel” and sperma means “seed”.
Angiosperm (biology definition): any of flower-producing plant. Angiosperms make up the
division Magnoliophyta belonging to Subkingdom Embryophyta of the Kingdom Plantae.
Etymology: from Greek “angeîon”, meaning “receptacle” + “spérma”, meaning “seed”.
Synonyms: flowering plant; Magnoliophyta; Angiospermae. Compare
Characteristics
Angiosperms are able to grow in a variety of habitats. They can grow as trees, shrubs, bushes,
herbs, and small flowering plants. Some of the characteristics of angiosperms include:
● All angiosperms have flowers at some stage in their life. The flowers serve as the
reproductive organs for the plant, providing them a means of exchanging genetic
information.
● Angiosperms have small pollen grains that spread genetic information from flower to
flower. These grains are much smaller than the gametophytes, or reproductive cells, used
by non-flowering plants. This small size allows the process of fertilization to occur
quicker in the flowers of angiosperms and makes them more efficient at reproducing.
● All angiosperms have stamens. Stamens are the reproductive structures found in flowers
that produce the pollen grains that carry the male genetic information.
● Angiosperms have much smaller female reproductive parts than non-flowering plants,
allowing them to produce seeds more quickly.
● Angiosperms have carpels that enclose developing seeds that may turn into a fruit.
● A great advantage for angiosperms is the production of endosperm. Endosperm is a
material that forms after fertilization and serves as a highly nutritional food source for the
developing seed and seedling.
, Angiosperm Anatomy and Morphological Features
With reference to the definition and background of the angiosperm plants elaborated above,
many scientists describe them as “flowering” plants and classified them into a single phylum: the
Anthophyta. Their floral anatomical parts include pollens, stamens, and/or carpels.
The sperm of the flowering plants are pollen grains that are produced by stamens. The pollen
grains contain the male gametes that may react with the female gametes (ova) in the ovaries of
the plants. These gametes enable angiosperms to reproduce sexually. (Note: apart from sexual
reproduction, angiosperms may also carry out certain forms of asexual reproduction, e.g.
vegetative propagation and apomixis.)
The pollen grains in the angiosperms are smaller in size than the pollen found in the
gymnosperms, hence the reduced size aids the process of fertilization by reaching the female
eggs in less time. It is often seen that some families of the angiosperms reproduce without being
fertilized or in other scenarios, by using their own pollen they can fertilize themselves. Hence,
the stamens play a very crucial role in the fertilization cycle of flowering plants.
The flowers after stamens and pollens are the next very important part of the anatomy of the
angiosperms and they are referred to as the structure where both male and female reproductive
parts of the angiosperms can be found. The flowers are designed in such a way that they may
attract insects and other mammals for the cross-pollination process. It can be seen in various
plants that the flowers are colorful and have pleasant smells.
The ovaries, behind the flowers of the plants, are enclosed in the carpels. The ovaries in the
angiosperms can receive the pollen and can start the process of producing seeds, flowers, and
fruits more swiftly as compared to gymnosperms. If the whole process of the development of the
plant can be observed carefully, it can be concluded that the fruit is developed from the flower
after pollination and this is the prime responsibility of the carpels. The detailed anatomy of the
flower as one of the angiosperms’ characteristics is shown in Figure 1.
The angiosperms, despite their diversity, are united by shared and derived features collectively
known as synapomorphies. Some of the vital angiosperms characteristics are that the ovules are
present in the carpels, which is a structure that is made up of ovary and the ovules are enclosed in
it and the process of pollination occurs here. Secondly, a cycle of double fertilization occurs
which leads to the formation of endosperm and there are three stamens that have a couple of
pollen sacs. Finally, the angiosperms have phloem tissues that are mainly composed of sieve
tubes and companion cells. Hence it can be concluded that the extent of angiosperms occurred
from various origins instead of one.
a vessel), variously named Angiospermae, Magnoliophyta, or Anthophyta, are a monophyletic
group currently thought to be the sister group to the gymnosperms. Angiosperms are by far the
most numerous, diverse, and “successful” extant plant group, containing well over 95% of all
land plant species alive today. Flowering plants grow in virtually every habitable region and are
dominant in some aquatic and most terrestrial ecosystems, the notable exception to the latter
being coniferous forests. Angiosperms comprise the great bulk of our economically important
plants, including our most valuable food crops.
What is an angiosperm? An angiosperm is a plant that produces flowers. The angiosperms, also
identified as the flowering plants, belong to one of the vital groups of plants having seeds. The
word angiosperm has been derived from a couple of Greek words where angeion stands for
“vessel” and sperma means “seed”.
Angiosperm (biology definition): any of flower-producing plant. Angiosperms make up the
division Magnoliophyta belonging to Subkingdom Embryophyta of the Kingdom Plantae.
Etymology: from Greek “angeîon”, meaning “receptacle” + “spérma”, meaning “seed”.
Synonyms: flowering plant; Magnoliophyta; Angiospermae. Compare
Characteristics
Angiosperms are able to grow in a variety of habitats. They can grow as trees, shrubs, bushes,
herbs, and small flowering plants. Some of the characteristics of angiosperms include:
● All angiosperms have flowers at some stage in their life. The flowers serve as the
reproductive organs for the plant, providing them a means of exchanging genetic
information.
● Angiosperms have small pollen grains that spread genetic information from flower to
flower. These grains are much smaller than the gametophytes, or reproductive cells, used
by non-flowering plants. This small size allows the process of fertilization to occur
quicker in the flowers of angiosperms and makes them more efficient at reproducing.
● All angiosperms have stamens. Stamens are the reproductive structures found in flowers
that produce the pollen grains that carry the male genetic information.
● Angiosperms have much smaller female reproductive parts than non-flowering plants,
allowing them to produce seeds more quickly.
● Angiosperms have carpels that enclose developing seeds that may turn into a fruit.
● A great advantage for angiosperms is the production of endosperm. Endosperm is a
material that forms after fertilization and serves as a highly nutritional food source for the
developing seed and seedling.
, Angiosperm Anatomy and Morphological Features
With reference to the definition and background of the angiosperm plants elaborated above,
many scientists describe them as “flowering” plants and classified them into a single phylum: the
Anthophyta. Their floral anatomical parts include pollens, stamens, and/or carpels.
The sperm of the flowering plants are pollen grains that are produced by stamens. The pollen
grains contain the male gametes that may react with the female gametes (ova) in the ovaries of
the plants. These gametes enable angiosperms to reproduce sexually. (Note: apart from sexual
reproduction, angiosperms may also carry out certain forms of asexual reproduction, e.g.
vegetative propagation and apomixis.)
The pollen grains in the angiosperms are smaller in size than the pollen found in the
gymnosperms, hence the reduced size aids the process of fertilization by reaching the female
eggs in less time. It is often seen that some families of the angiosperms reproduce without being
fertilized or in other scenarios, by using their own pollen they can fertilize themselves. Hence,
the stamens play a very crucial role in the fertilization cycle of flowering plants.
The flowers after stamens and pollens are the next very important part of the anatomy of the
angiosperms and they are referred to as the structure where both male and female reproductive
parts of the angiosperms can be found. The flowers are designed in such a way that they may
attract insects and other mammals for the cross-pollination process. It can be seen in various
plants that the flowers are colorful and have pleasant smells.
The ovaries, behind the flowers of the plants, are enclosed in the carpels. The ovaries in the
angiosperms can receive the pollen and can start the process of producing seeds, flowers, and
fruits more swiftly as compared to gymnosperms. If the whole process of the development of the
plant can be observed carefully, it can be concluded that the fruit is developed from the flower
after pollination and this is the prime responsibility of the carpels. The detailed anatomy of the
flower as one of the angiosperms’ characteristics is shown in Figure 1.
The angiosperms, despite their diversity, are united by shared and derived features collectively
known as synapomorphies. Some of the vital angiosperms characteristics are that the ovules are
present in the carpels, which is a structure that is made up of ovary and the ovules are enclosed in
it and the process of pollination occurs here. Secondly, a cycle of double fertilization occurs
which leads to the formation of endosperm and there are three stamens that have a couple of
pollen sacs. Finally, the angiosperms have phloem tissues that are mainly composed of sieve
tubes and companion cells. Hence it can be concluded that the extent of angiosperms occurred
from various origins instead of one.
