Taxon List & Counts by Type

The current list of taxa in the online version of the FNA keys is here.  As new volumes of the FNA are published and put online, this list will be updated. For most taxa, a unique taxon id is shown in the first column (a few exceptions are numerated below under Terminal Taxa). The types shown in the third column of the list is explained below.

Given that the plant family has already been identified, the FNA keys allow more and more specific identification at each taxon rank, ultimately leading to a terminal taxon.  The number of taxa at the different ranks are as follows:

Rank	Type within Rank	Number of Taxa
family	family	234
genus	genus	1785
genus subclasses	species	10,939
	hybrid	82
species subclasses	subsp.	903
	var.	2105
	var.× or nothovar	3*
subsp. subclasses	var.	15
Total in FNA keys		16,066

* See:
Asteraceae Petasites frigidus var.×vitifolius
Rosaceae Crataegus ×sicca nothovar. sicca
Rosaceae Crataegus ×sicca nothovar. glabrifolia 

Non-Terminal Taxa - Taxa that are non-terminal (families, genera and some species) are of three types (see the third column of my taxon list):

keyed		A key is used to differentiate subclasses	2145
not keyed	singleton parent	There is only one subclass	1080
	species for naming* only	Species not in a key, but subspecies is	4
Total Non-Terminal Taxa			3229

* See section on Naming Hierarchy

Keyed taxa will be discussed further in Key Types and Subkeys.

Terminal Taxa - Terminal taxa are also indicated in the third column of my taxon list.  In a few cases, destination targets in the FNA keys are not listed in the site's taxa list; these targets are distinguished from the other terminal taxa.

terminating	A target that has a unique taxon id	12,791
terminatingOnAssocTaxon	Rather than have its own taxon id, the target is described on the page of an associated taxon	41
terminatingOnBadTaxon	A target with no taxon page or with a bad taxon id	5
Total Terminal Taxa		12,837

[In order to clarify taxa that are classified as terminatingOnAssocTaxon or terminatingOnBadTaxon, I need to indicate whether or not these taxa are synonyms for another taxon that is also a target.]

The Node Structure and Types section shows how the taxon id type (one of the three types shown in this table) is stored in the node for each taxon.

The FNA keys can be used to differentiate the following types of destination targets:

hybrid	81
species	9737
subsp.	896
var.	2123
Total Terminal Taxa	12,837

Checklist - A different view of all FNA taxa is in this Checklist. This was created slightly later than the above tables, so there are 16,822 taxa and of these 13,410 are terminal. Not included are taxa terminating on associated or bad taxa. But it also lists 26,985 synonyms.

The taxon hierarchy is shown by indentation: starting with family, each lower level is indented by two characters. After each taxon, any synonyms are shown in square brackets, with multiple synonyms separated by semicolon. Because of the possible synonyms, the line for any taxon can become too long for the page width of 96 characters, so it is continued on the next line, indented by one more character from the current level.