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dc.contributor.author Davis, W. A.
dc.contributor.author Junak, Steven A.
dc.date.accessioned 2011-01-21T19:28:36Z
dc.date.available 2011-01-21T19:28:36Z
dc.date.issued 1987
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_US
dc.identifier.uri http://hdl.handle.net/10139/3027
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_US
dc.language.iso en_US en_US
dc.publisher National Park Service en_US
dc.subject San Nicolas Island en_US
dc.subject Channel Islands en_US
dc.subject California Islands en_US
dc.subject endemic species en_US
dc.subject Manyhead Desertdandelion en_US
dc.subject Dunedelion en_US
dc.title Hybridization between Malacothrix polycephala and M . incana (Asteraceae) on San Nicolas Island, California en_US
dc.type Article en_US


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