Morphometric relationships in Hordeum vulgare (Triticeae, Poaceae). II. Hordeum agriocrithon, H. distichum, H. lagunculiforme, H. spontaneum, and H. vulgare

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Abstract
Morphometric analyses of five morphs in Hordeum vulgare L. consisted of: computation of general statistics and frequency distributions by character for the entire data and for each morph separately; cross tabulation; various discriminant analyses; computation of Jardine and Sibson's (1968. Math. Biosci. 2: 465–482) information radius between the morphs followed by Bk clustering; and computation of phylogenetic trees from the transformed information radius matrix using three related methods. It is concluded that on the basis of morphometric data, excluding the traditional characters, that at least three morphs within H. vulgare (sensu lato) ought to be recognized as taxonomic entities. These are known as H. spontaneum C. Koch, H. distichum L., and H. vulgare (wild, two-row, and six-row barley, respectively). The hybrids and hybrid derivatives, often referred to as H. agriocrithon Åberg, are not regarded as entities but as products of interaction. The status of H. lagunculiforme Bakht. is uncertain and needs to be further investigated. It is postulated that a lagunculiforme-like entity might have been the progenitor of the group.

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