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DIVISION II.  RULES AND RECOMMENDATIONS
CHAPTER IV. EFFECTIVE AND VALID PUBLICATION
SECTION 3.  AUTHOR CITATIONS

Article 47

47.1. An alteration of the diagnostic characters or of the circumscription of a taxon without the exclusion of the type does not warrant a change of the author citation of the name of the taxon.

Ex. 1. When the original material of Arabis beckwithii S. Watson (1887) is attributed to two different species, as by Munz (1932), that species not including the lectotype must bear a different name (A. shockleyi Munz) but the other one is still named A. beckwithii S. Watson.
Ex. 2. Myosotis as revised by Brown differs from the genus as originally circumscribed by Linnaeus, but the generic name remains Myosotis L. since the type of the name is still included in the genus (it may be cited as Myosotis L. emend. R. Br.: see Rec. 47A).
Ex. 3. The variously defined species that includes the types of Centaurea jacea L. (1753), C. amara L. (1763) and a variable number of other species names is still called C. jacea L. (or L. emend. Coss. & Germ., L. emend. Vis., or L. emend. Godr., as the case may be: see Rec. 47A).

Recommendation 47A

47A.1. When an alteration as mentioned in Art. 47 has been considerable, the nature of the change may be indicated by adding such words, abbreviated where suitable, as "emendavit" (emend.) followed by the name of the author responsible for the change, "mutatis characteribus" (mut. char.), "pro parte" (p. p.), "excluso genere" or "exclusis generibus" (excl. gen.), "exclusa specie" or "exclusis speciebus" (excl. sp.), "exclusa varietate" or "exclusis varietatibus" (excl. var.), "sensu amplo" (s. ampl.), "sensu lato" (s. l.), "sensu stricto" (s. str.), etc.

Ex. 1. Phyllanthus L. emend. Müll. Arg.; Globularia cordifolia L. excl. var. (emend. Lam.).
 

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