Abstract
Interspecific triploid hybrids of Triticum searsii (2x) (= Aegilops searsii) with T. longissimum (4x), T. speltoides (4x), and T. bicorne (4x) were made and cytologically studied. Optimization analyses of the meiotic configurations allow the calculation of a numerical measure (the natural logarithm of the ratio of the relative affinity of the most closely related chromosomes to the most distantly) of phylogenetic distance and showed that T. searsii was almost equally but distantly related to the three other species. The validity of T. searsii being a biological species is therefore confirmed.Key words: triploid, wheat, meiosis, phylogenesis, hybrid.

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