Sie können Bookmarks mittels Listen verwalten, loggen Sie sich dafür bitte in Ihr SLUB Benutzerkonto ein.
Medientyp:
E-Artikel
Titel:
Biosystematics of Mexican Spruce Species and Populations
Beteiligte:
Taylor, Ronald J.;
Patterson, Thomas F.
Erschienen:
International Bureau for Plant Taxonomy and Nomenclature, 1980
Erschienen in:Taxon
Sprache:
Englisch
ISSN:
0040-0262
Entstehung:
Anmerkungen:
Beschreibung:
<p>Two species of Mexican spruce, Picea chihuahuana and P. mexicana, have been named and described within the last 40 years. In addition a spruce population that does not match any known species has recently been reported. In this study, 30 specimens from each of six populations of Mexican spruce, four of P. chihuahuana, one of P. mexicana, and the unnamed population, were systematically analyzed using chemical and morphological characters. In addition, two populations of P. engelmannii and one of P. pungens, from southern Arizona and New Mexico, U.S.A., respectively, were similarly analyzed. The data derived from the chemical and morphological studies were in close agreement and indicated that: 1) Picea mexicana is a disjunct population (variety) of P. engelmannii; 2) Picea chihuahuana is a distinct species with no close affinity to other taxa examined; 3) the unnamed population appears to constitute a relict hybrid swarm, one parent being P. engelmannii (including P. mexicana) the other possibly P. chihuahuana or P. pungens. Finally, the characteristics used by Martinez (1961) to separate P. engelmannii from P. mexicana were reexamined and found not to differ significantly in the two taxa. Therefore it is proposed that P. mexicana be reduced to varietal status as P. engelmannii var. mexicana.</p>