9.6: Plant Classification

Last updated
Save as PDF

Page ID: 6637

\( \newcommand{\vecs}[1]{\overset { \scriptstyle \rightharpoonup} {\mathbf{#1}} } \) \( \newcommand{\vecd}[1]{\overset{-\!-\!\rightharpoonup}{\vphantom{a}\smash {#1}}} \)\(\newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\) \( \newcommand{\Span}{\mathrm{span}}\) \(\newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\) \( \newcommand{\Span}{\mathrm{span}}\)\(\newcommand{\AA}{\unicode[.8,0]{x212B}}\)

f-d:cbf7374bccd51d078cd83341a1ffbfd0ed87531ce6e08e2d301a3703 IMAGE_TINY IMAGE_TINY.1

How do you know which group one particular plant belongs to?

So many different types of plants. Does the plant have roots? Or flowers? Or just seeds? Or roots and stems but not seeds? These are all characteristics used to classify plants. How many different types of plants do you see in this Japanese garden?

Classification of Plants

The scientific classification of modern land plants is under constant revision. Informally, land plants can be classified into the groups listed in Table below. Major divisions and types of modern land plants are organized in this table. Why do the first five types of plants require a moist habitat?

The most basic division is between nonvascular plants and vascular plants. Vascular plants are further divided into those that reproduce without seeds and those that reproduce with seeds. Seed plants, in turn, are divided into those that produce seeds in cones and those that produce seeds in the ovaries of flowers. Seed plants are called gymnosperms. Seed plants called angiosperms produce seeds in the ovaries of flowers.

Major Division	Types of Plants	No. of Living Species	Description
Nonvascular Plants
	Liverworts	7,000
	Hornworts	150
	Mosses	10,000	They lack leaves and roots. They have no stems, so they grow low to the ground. They reproduce with spores. They need a moist habitat.
Vascular Plants
	Clubmosses	1,200	They have roots and tiny leaves. They have no stems, so they grow low to the ground. They reproduce with spores. They need a moist habitat.
	Ferns	11,000	They have large leaves in fronds. They have stiff stems, so they are tall growing; some are trees. They reproduce with spores. They need a moist habitat.
	Ginkgoes	1
	Cycads	160
	Conifers	700
	Gnetae	70	Most are trees with wood trunks. They have adaptations to dryness such as needle-like leaves. They reproduce with seeds and pollen. They produce seeds in cones.
	Flowering Plants	258,650	They have tremendous diversity in size, shape, and other characteristics. They reproduce with seeds and pollen. They produce seeds in the ovaries of flowers. Ovaries may develop into fruits, which enhance seed dispersal.

Summary

The most basic division of living plants is between nonvascular and vascular plants.

Vascular plants are further divided into seedless and seed plants.
Seed plants called gymnosperms produce seeds in cones.
Seed plants called angiosperms produce seeds in the ovaries of flowers.

Review

Compare the different types of plants in the Table above. Which type of plants would you say is most successful? Support your answer with data from the table.