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Commelinidae

 
(′kä·mə′lī·nə′dē)

(botany) A subclass of flowering plants in the class Liliopsida.


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A subclass of the class Liliopsida (monocotyledons) of the division Magnoliophyta (Angiospermae), the flowering plants, consisting of 7 orders, 16 families, and nearly 15,000 species. The orders include Commelinales, Eriocaulales, Restionales, Juncales, Cyperales, Hydatellales, and Typhales. For further information see separate articles on each order.

These monocotyledons are syncarpous (the carpels are united in a compound ovary) or pseudomonomerous (reduced to a single carpel from a syncarpous ancestry). The endosperm is usually starchy, and the perianth is either well differentiated into sepals and petals or more or less reduced and not petallike. The stomates have two or more subsidiary cells, the pollen is either binucleate or more often trinucleate, and the endosperm may be nuclear. Many of the families have well-developed vessels in all vegetative organs. Several of the orders of Commelinidae have often been treated as a single order Farinosae or Farinales. See also Liliopsida; Magnoliophyta; Plant kingdom.


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Commelinidae

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Commelinidae is a botanical name at the rank of subclass. Circumscription of the subclass will vary with the taxonomic system being used (there are many such systems); the only requirement being that it includes the family Commelinaceae. A well-known system that did use this name is the Cronquist system (1981), but it was also used by the Takhtajan system:

Contents

Commelinidae in the Takhtajan system

In the Takhtajan system treats this as one of six subclasses within the class Liliopsida (=monocotyledons). It consists of

Commelinidae in the Cronquist system

In the Cronquist system treats this as one of four subclasses within the class Liliopsida (=monocotyledons). It consists of:

APG system

The APG II system does not use formal botanical names above the rank of order; most of the plants involved here are assigned to the clade commelinids in the monocots (its predecessor, the APG system knew the clade commelinoids).[1][2][3]

Notes


 
 
Related topics:
Bromeliales (botany)
Commelinales (botany)
Eriocaulales (botany)

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McGraw-Hill Science & Technology Dictionary. McGraw-Hill Dictionary of Scientific and Technical Terms. Copyright © 2003, 1994, 1989, 1984, 1978, 1976, 1974 by McGraw-Hill Companies, Inc. All rights reserved.  Read more
McGraw-Hill Science & Technology Encyclopedia. McGraw-Hill Encyclopedia of Science and Technology. Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved.  Read more
Wikipedia on Answers.com. This article is licensed under the Creative Commons Attribution/Share-Alike License. It uses material from the Wikipedia article Commelinidae Read more

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