Learning Center
Plans & pricing Sign in
Sign Out

1 Nomenclature lecture


   Nomenclature is the system of orderly
    classifying and naming
   Botanical Nomenclature is the system orderly
    classifying and naming plants
   Living creatures are divided into several
    Kingdoms  Plant Kingdom is our interest here

   Within the Plant Kingdom plants are
    divided into four principle subdivisions
    called divisions.
Nomenclature - Divisions
    Thallophytes (algae & fungi)
    Bryophytes (mosses and liverworts)
    Pteriodophytes (ferns; reproduce by means of
    Spermatophytes – (seed bearing plants; have
     true roots, stems, leaves & vascular system)
Nomenclature – Spermatophytes
   Gymnosperm (conifers, Ginkgo)
   Angiosperm (flowering plants)
       Subclass Dicot – 2 cotyledons, flower parts
        generally in 5’s & network veination
       Subclass Monocot – 1 cotyledon, flower parts
        generally in 3’s & parallel veination
Nomenclature – Orders

   The subclasses of Angiosperms are divided
    into orders, the names of which often
    terminate in –ales, as the Asterales.
Nomenclature –
      Purple Coneflower
   Kingdom  Plantae
       Division  Spermatophytes
           Class  Angiosperm
               Subclass  Dicotyledonae
                   Order  Asterales
                       Family  Asteraceae
                          Genus  Echinacea
                               Species  purpurea
Nomenclature –
      The Binomial System
   The Binomial System: a 2 word scientific
    name; developed by Carl Von Linne (1737)
      Genus & specific epithet (species)
   Each plant has only one valid Scientific
   Names are given based on International
    Code of Botanical Nomenclature
Nomenclature –
      The Binomial System
   Genus  Generic name for a plant group
   Specific epithet  Scientific name for one
    plant (alba)
   Quercus alba (White Oak)
Nomenclature –
      The Binomial System
   Special divisions within a plant species:
         Variety   A self perpetuating mutation
          or off-spring that differs significantly
          from parent species
         Cultivar  A manmade and or man
          maintained offspring that differs
          significantly from parent species
Nomenclature –
      The Binomial System
   Scientific Names are descriptive and may
    describe a plant’s:
       Habitat
           Betula nigra = water
       Physical characteristics (leaf, size, form,
        color, ect.)
           Magnolia grandiflora = big flower
Nomenclature –
      The Binomial System
   Scientific Names are descriptive and may
    describe a plant’s:
       Place of origin (geography)
           Camellia japonica  Japan
       Ancient classical name
           Lycopersicon esculentum
       Commemorative
           Ilex x attenuata ‘Fosterii’
Nomenclature –
      The Common Name
   Common names can vary from locality,
    person to person, ect.
   Tulip poplar or yellow poplar or tulip
   Tulip magnolia or saucer magnolia or
    tulip tree???
Nomenclature –
      Rules for Writing
   Genus  First letter is always capitalized
    and the name is underlined or italicized
   Specific epithet  First letter is generally
    NOT capitalized, the name is underlined or
       Cornus florida or Cornus florida
Nomenclature –
      Rules for Writing
   Cultivar  A cultivar name is capitalized
    and placed within single quotes
       Cornus florida ‘Cherokee Chief’
   Variety  A variety name is preceded by
    var. and is underlined or italicized
       Rudbeckia fulgida var.compacta
Nomenclature –
      Rules for Writing
Intergeneric cross: A cross between 2
genera of plants… Rare…
     x Fatshedera lizei
Interspecific hybrids or interspecific cross:
2 plants in the same genus with different
     Abelia x grandiflora
"No occupation is so delightful to me as
the culture of the earth and no culture
comparable to that of the garden"-

              Thomas Jefferson

To top