2 - plant names and classifications

2 - plant names and classifications - PBIO 1220 Plant Names...

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PBIO 1220 1-12-10 Plant Names and Classification Naming Organisms: the binomial system of nomenclature o We organize plants into groups using many different criteria Ex: edible, medicinal, roses Classification by lifecycle Annuals – one year life cycle Biennials – complete life cycle in more than one year, but less than two Perennials – complete life cycle in more than two years o Problems with the use of common names Can be confusing Same name to describe different plants o Ex: Broad-leaved plantain It is important to have worldwide uniformity in naming and classifying all organisms o Taxonomy: the science of discovering, describing, naming, and classifying organisms o What is a species? The species is the fundamental category of biological classification Important in classifying and understanding speciation, and therefore, evolution Species concepts: perception and definitions of species Remains a hot topic Morphological species, biological species, and evolutionary species o Morphological species concept: A species is the smallest group of organisms that can be consistently distinguished by the presence or absence of body parts and the shapes, sizes, and numbers of these body parts The most practical and widely used species concepts Problem: speciation has not always formed well-defined species The lines between species are often blurred Ex: the cactus genus Opuntia includes anywhere from 400- 1000 species, depending on whose judgment is followed
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2 - plant names and classifications - PBIO 1220 Plant Names...

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