Plants are a major group of living things including familiar organisms such as trees, flowers, herbs, ferns and mosses. About 350,000 species of plants, defined as seed plants, bryophytes, ferns and fern allies, have been estimated to exist. As of 2004, some 287,655 species had been identified, of which 258,650 are flowering and 15,000 bryophytes.

Aristotle divided all living things between plants, which generally do not move, and animals. In Linnaeus' system, these became the Kingdoms Vegetabilia (later Plantae) and Animalia. Since then, it has become clear that the Plantae as originally defined included several unrelated groups, and the fungi and several groups of algae were removed to new kingdoms. However, these are still often considered plants in many contexts. Indeed, any attempt to match "plant" with a single taxon is doomed to fail, because plant is a vaguely defined concept unrelated to the presumed phylogenic concepts on which modern taxonomy is based.

Embryophytes

---

Main article: Embryophytes

Most familiar are the multicellular land plants, called embryophytes. They include the vascular plants, plants with full systems of leaves, stems, and roots. They also include a few of their close relatives, often called bryophytes, of which mosses and liverworts are the most common.

More on [ Plant ]

Wiley: All New Reference Titles

Handbook of Dermatology: A Practical Manual
Margaret Mann, David Berk, Daniel Popkin, Susan J. Bayliss Mallory Mon, 18 Aug 2008 04:00:00 -0000
  * Clear presentation using algorithms and protocols, with treatments integrated throughout * Structured around three main components - medical dermatology, surgical dermatology and pharmacology/treatment * Written and trialled by graduating residents Read More...
MCTS: Windows Server 2008 Applications Infrastructure Configuration Study Guide (Exam 70-643, with CD)
Joel Stidley Mon, 11 Aug 2008 04:00:00 -0000
  * This comprehensive guide offers 100 percent coverage of the exam's objectives, real-world scenarios, hands-on exercises, and challenging review questions * Prepares readers to configure terminal services, Web Services infrastructure, security for Web Services, communication services, and file and print services * The newest set of Microsoft Certified Technology Specialist (MCTS) and Microsoft Certified Information Technology Professional (MCITP) Read More...
70-643: Windows Server 2008 Applications Infrastructure Configuration, Package
Microsoft Official Academic Course Tue, 15 Jul 2008 04:00:00 -0000
  Exam 70-643, Windows Server 2008 Applications Platform Configuration.    The newest iteration of the Microsoft Official Academic Course (MOAC) program for network administration courses using Windows Server 2008 and mapping to the Microsoft Certified Technology Specialist (MCTS) 70-643 certification exam. The MOAC IT Professional series is the Official from Microsoft, turn-key Workforce training program that leads to professional certification Read More...
CISSP: Certified Information Systems Security Professional Study Guide, 4th Edition
James Michael Stewart, Ed Tittel, Mike Chapple Tue, 08 Jul 2008 04:00:00 -0000
  Building on the popular Sybex Study Guide approach, CISSP®: Certified Information Systems Security Professional Study Guide, 4th Edition provides 100% coverage of the CISSP Body of Knowledge exam objectives. Find clear and concise information on crucial security topics, practical examples and insights drawn from real-world experience, and cutting-edge exam preparation software, including two full-length bonus exams and electronic flashcards. Read More...
MCTS: Windows Server 2008 Network Infrastructure Configuration: Exam 70-642
William Panek, Tylor Wentworth Tue, 08 Jul 2008 04:00:00 -0000
  Efficiently prepare for the Windows Server 2008 certification exam with MCTS: Windows Server 2008 Network Infrastructure Configuration: Exam 70-642, a comprehensive study tool that will guide you through everything you need to know for the test. This study guide includes 100% coverage of the exam objectives, real world scenarios, hands-on exercises, and challenging review questions, both in the book and on the CD. Read More...
70-642: Windows Server 2008 Network Infrastructure Configuration, Package
Microsoft Official Academic Course Mon, 23 Jun 2008 04:00:00 -0000
  Exam 70-642, Windows Server 2008 Network Infrastructure Configuration.  The newest iteration of the Microsoft Official Academic Course (MOAC) program for network administration courses using Windows Server 2008 and mapping to the Microsoft Certified Technology Specialist (MCTS) 70-642 certification exam. The MOAC IT Professional series is the Official from Microsoft, turn-key Workforce training program that leads to professional certification Read More...

Subscribe to Reference RSS feed