isocharn.
/ˈʌɪsəʊkɑː/ A line (imaginary or on a map) linking areas containing plants showing similar numbers of distinguishing characteristics.
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isophane1918
isepiptesis1926
isochar1963
1963 P. H. Davis & V. H. Heywood Princ. Angiosperm Taxon. ix. 317 The second procedure involves the drawing of Isopsepheren, a term which we can anglicise to isochars. These are based on the largest possible number of contrasting character expressions found in the taxa being studied... We are grateful to Dr. W. T. Stearn for suggesting this term.
This entry has not yet been fully updated (first published 1976; most recently modified version published online March 2018).
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n.1963