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dc.contributor.author Davis, W. A. en
dc.contributor.author Junak, Steven A. en
dc.date.accessioned 2011-01-21T19:28:36Z en
dc.date.available 2011-01-21T19:28:36Z en
dc.date.issued 1987 en
dc.identifier.citation Davis, W. A. and Steven A. Junak. "Hybridization between Malacothrix polycephala and M . incana (Asteraceae) on San Nicolas Island, California." In: 3rd California Islands Symposium. 1987. 89-95. en
dc.identifier.uri http://hdl.handle.net/10139/3027 en
dc.description.abstract Natural hybridization between Malacothrix polycephala W . Davis (ined.), an annual, and M . incana (Nutt.) Torrey & A. Gray, a perennial, on San Nicolas Island, California was examined using herbarium studies, studies in the field, and studies of plants grown in growth chambers. Malacothrix incana has apparently been on San Nicolas Island for less than 25 yr, but M . polycephala is a long-time resident. The two species differ morphologically, physiologically, and in their banding patterns for the enzyme aspartatate aminotransferase. N o strong isolating mechanisms have been found between the two species and extensive hybridization is occurring on San Nicolas Island. Studies of growth chamber progenies indicate that natural hybridization has produced many combinations of the morphological and physiological features of the parental species. The evolutionary potential of hybridization between M . polycephala and M . incana appears to be considerable. en
dc.language.iso en_US en
dc.publisher National Park Service en
dc.subject San Nicolas Island en
dc.subject Channel Islands en
dc.subject California Islands en
dc.subject endemic species en
dc.subject Manyhead Desertdandelion en
dc.subject Dunedelion en
dc.title Hybridization between Malacothrix polycephala and M . incana (Asteraceae) on San Nicolas Island, California en
dc.type Article en

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