BOT 360F - Families of Vascular Plants 

The taxonomic hierarchy


Rank of taxonomic categories recognized by the International Code of Botanical Nomenclature (ICBN)*

Obligatory ranks in boldface

* The link above is to the 1999 St. Louis code; that was superceded by the 2005 Vienna code, and that in turn has now been superceded by the International Code of Nomenclature for algae, fungi, and plants (the Melbourne code), following the International Botanical Congress in Melbourne in 2011.

CATEGORY

STANDARD SUFFIX

EXAMPLE GROUPS

Kingdom

-bionta

Viridiplantae (green plants)

Phylum (or Division)

-phyta

Embryophyta (embryophytes)

Subphylum (Subdivision)

-phytina

Tracheophytina (vascular plants)

Class

-opsida

Angiospermopsida (angiosperms)

Subclass

-idae

Rosidae

Superorder

-anae

Order

-ales

Rosales

Suborder

-inae

Superfamily

-ariae

Family

-aceae

Rosaceae (rose family)

Subfamily

-oideae

Maloideae (apple subfamily)

Tribe

-eae

"Pyreae" (pear tribe)*

Subtribe

-inae

"Pyrinae" (pear subtribe)*

Genus

None; italicized, initial letter capitalized

Crataegus (hawthorn)

Species

None; genus name plus species epithet, italicized

Crataegus rivularis (river hawthorn)

    *These names, based on the genus Pyrus, will change to ones based on the older genus Malus, according to recent (2011) changes in the code of nomenclature.

cf. Tables 2 and 3, p. 547, Judd et al. (2008)


Hierarchical relationships between groups (see HERE re formation of species names)

Rosaceae

Dryadoideae

 

Dryas

 

D. drummondii Richardson

D. hookeriana Juzepczuk

Maloideae

 

Sorbus

 

S. scopulina Greene

S. sitchensis Roemer

Crataegus

 

C. rivularis Nuttall

C. saligna Greene

C. douglasii Lindley

C. suksdorfii (Sargent) Kruschke

C. monogyna Jacquin

cf. Judd et al. (2008) Chapter 3, Classification and system in flowering plants: historical background (pp. 39-52) and Appendix 1, Botanical Nomenclature (pp. 543-552)

cf. also summary found HERE.




| What are plant families? | How do we distinguish them? | How and why do we study them? | Selected vascular plant families of Ontario | Reading List | Course outline |

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2003 Botany Department, University of Toronto.

Please send your comments to tim.dickinson@utoronto.ca; last updated 18-Sep-2011