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Subgroups in theHordeum patagonicum complex (Poaceae)

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Seeds of theHordeum patagonicum complex were collected from the field and grown in the greenhouse. The aim was to take a sample of members of the complex, and on the basis of the phenotypic similarities in some morphological and physiological characters, determine whether distinct groups exist. When cluster analyses, to generate hypotheses, and orthodox statistical procedures, for hypotheses obtained a priori, were applied to the reproductive morphology, germination and flowering patterns, onlyH. patagonicum subsp.magellanicum, out of the five recognized taxa, could be distinguished consistently. The remaining four taxa, which overlapped considerably, could be re-formed into three groups whose centroids were different but whose ranges of variation were not distinct from each other. We conclude that the highly cross-compatible members of theH. patagonicum complex, first defined as species and later redefined as subspecies are probably no more than biotypes.

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Giles, B.E., Lefkovitch, L.P. Subgroups in theHordeum patagonicum complex (Poaceae). Pl Syst Evol 174, 47–66 (1991). https://doi.org/10.1007/BF00937693

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Key words

  • Angiosperms
  • Poaceae
  • Hordeum patagonicum complex
  • barley
  • Classification
  • numerical methods
  • evolution