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Wheat Taxonomy

Wheat Taxonomy

Unaccepted Names Table

Many names for wild and domesticated wheat species do not qualify as accepted names under the International Code of Botanical Nomenclature (ICBN). They are rejected as illegitimate, not validly published, ambiguous, or synonymous. This table lists the most commonly encountered unaccepted names.

For those wishing to consult the ICBN, the current print edition is the 2000 ICBN (St. Louis Code) [reference], available in libraries and herbaria. The previous 1994 edition (Tokyo Code) is posted on the internet at https://archive.bgbm.org/iapt/nomenclature/code/.

Unaccepted name Status Accepted name [1]
Ae. aucheri Boiss. illegitimate Ae. speltoides Tausch
Ae. caudata L. [2] ambiguous Ae. markgrafii (Greuter) Hammer
Ae. lorentii Hochst. synonymous Ae. biuncialis Vis.
Ae. ovata L. [3] ambiguous Ae. geniculata Roth [3]
Ae. squarrosa L. illegitimate Ae. tauschii Cosson
Ae. triaristata Willd. ambiguous Ae. neglecta Req. & Bertol.
Ae. variabilis Eig illegitimate Ae. peregrina (Hackel in J. Fraser) Maire & Weiller
T. columnare (Zhuk.) Morris & Sears not validly published not yet published
T. dichasians (Zhuk.) Bowden not validly published T. markgrafii Greuter
T. ovatum (L.) Raspail [3] ambiguous T. vagans (Jordan & Fourr.) Greuter [3]
T. searsii (Feldman & Kislev) Feldman not validly published not yet published
T. sharonense (Eig) Feldman & Sears not validly published not yet published
T. tauschii (Coss.) Schmalh. [4] synonymous T. aegilops P.Beauv. ex Roemer & Schultes [4]
T. triaristatum (Willd.) Godron & Gren. ambiguous T. neglectum (Req. ex Bertol.) Greuter

Explanatory notes

  1. In the case of the ambiguous names listed in this table, the Accepted Name refers to the modern concept of the species. For more details on the history of each of these ambiguous names, see Greuter (1967), Scholz and Slageren (1994), and Slageren (1994) and footnotes 2 and 3 below.
  2. The 1994 proposal by Scholz and Slageren to conserve the ambiguous name Ae. caudata was rejected by the Permanent Nomenclatural Committee for Spermatophyta (ICBN, Div. III) in 1996. The correct name for the C-genome species in Aegilops is Ae. markgrafii; in Triticum, T. markgrafii; and in Orrhopygium, Orrhopygium markgrafii.
  3. As described by Linnaeus, Ae. ovata actually encompassed two UM-genome taxa Ae. ovata and Ae. neglecta (= Ae. triaristata). After Linnaeus, other botanists classifying these two species added to the nomenclatural confusion. In the modern taxonomy, Eig and Zhukovsky structured the concept of Ae. ovata as it has come to be understood, whereas Löve applied Ae. ovata in the sense of Ae. neglecta. Given the historical ambiguity of the name, the names Ae. ovata and T. ovatum are now rejected in accordance with the ICBN [see ambiguous names]. By the rules of priority, this species name changes to Ae. geniculata in Aegilops and T. vagans in Triticum.
  4. The correct name for the D-genome species in Triticum is still in controversy ─ T. aegilops (published 1817) or T. tauschii (published in 1897). According to Slageren, T. aegilops is the earliest published name for the D-genome species when classified in Triticum. However, this determination is still uncertain because Slageren did not verify that Roemer and Schultes, the botanists who published the name, were correct in their evaluation of the synonymy of T. aegilops. (cf. p. 423 of Slageren). In the Kimber and Sears classification, T. tauschii is used.