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Field Botany – Spring 2013. Course Website. http://courses.knox.edu/bio316/. Botany Labs. Textbook. How many plant species are there?. Illinois – over 3200 vascular plants Northeastern North America – over 4600 vascular plants (Gleason and Cronquist) California – over 4400 vascular plants.

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course website
Course Website
  • http://courses.knox.edu/bio316/
how many plant species are there
How many plant species are there?
  • Illinois – over 3200 vascular plants
  • Northeastern North America – over 4600 vascular plants (Gleason and Cronquist)
  • California – over 4400 vascular plants
how many plant species are there10
How many plant species are there?
  • Illinois – 58,000 square miles – over 3200 vascular plants
  • Costa Rica – 19,600 square miles – over 8,000 vascular plants
how many plant species are there total in 2010
How many plant species are there?- total in 2010
  • 16,000 Bryophytes (mosses, liverworts and hornworts)
  • 12,000 Pterophytes (ferns and fern allies)
  • 1021 Gymnosperms
  • 282,000 flowering plants (Angiosperms)
  • 311,000 total plant species
  • Some add in green algae – 8500 species
how many endangered plant species
How many endangered plant species?
  • In 1997 the IUCN (International Conservation Union) Red Data list for plants rated 34,000 species as endangered out of 60,000 species evaluated
  • Then changed evaluation procedures – IUCN now rates 8,000 species as endangered out of 11,000 species evaluated
  • UK (very well known flora) lists 20% of species as endangered
  • Likely that 1 out of 4 plant species is endangered
definitions
Definitions
  • Taxonomy - the study and description of the variation of organisms, the investigation of the causes and consequences of this variation, and the manipulation of the data obtained to produce a system of classification
  • Classification (as process) - the production of a logical system of categories, each containing any number of organisms, which allows easier reference to its components, the kinds of organisms
  • Classification (as object) - is that logical system itself
definitions cont d
Definitions cont’d
  • Identification - naming of an organism by reference to an already existing classification system
  • Taxon - any taxonomic grouping - division, class, family, genus, etc.
  • Description - statement of the characteristics of a taxon
  • Characters that contribute to a taxonomic description are known as taxonomic or systematic characters
definitions cont d25
Definitions cont’d
  • Diagnosis - shortened description covering only those characters (diagnostic characters) which are necessary to distinguish a taxon from other related taxa
  • flora (lower case) - plant life of a given area
  • Flora (upper case) is a book or other work describing the flora of a given area
classification
Classification
  • Need for classification is absolute – it is only by naming organisms and grouping them in recognizable categories that we can begin to understand the vast array of diversity that exists