With the object of establishing the interspecific relationships between Thymus vulgaris, Th. aestiws, Th. zigis and Th. hyemalis, all belonging to the section Thymus Jalas, a comparative study of morphological and geographical characteristics, flowering seasons and karyology of these taxa has been undertaken along with various interspecific crosses which allow us to observe the behaviour of the hybrids. The results of this study have lead us to propose a hypothesis concerning the origin of the said taxa as well as to reach conclussions concerning the establishement of the taxonomic units which correspond to each one of them. The arguments upon which we base our hypothesis are discussed in the present work.
Con el fin de establecer las relaciones interespecificas entre los taxones Thymus vulgaris, Th. aestivus, Th. zygis y Th. hyemalis, hemos observado el comportamiento de los hibridos interespecificos obtenidos artificialmente, efectuando ademas un estudio comparative de las caracteristicas morfologicas, geograficas, epoca de floracion y cariologia de aquellos.
Los resultados obtenidos nos conducen a la proposition de una hipotesis acerca del origen de dichos taxones, asi como al establecimiento de las unidades taxonomicas correspondientes a cada uno de ellos. Los argumentos en los que se basa dicha hipotesis son discutidos en el presente trabajo.
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