KIM, SANGTAE1,2*, CHONG-WOOK PARK1, and YOUNGBAE SUH2. 1School of Biological Sciences, Seoul National University, Seoul 151-742, Korea; 2Natural Products Research Institute, Seoul National University, Seoul 110-460, Korea. - Taxonomic revision of Magnolia section Maingola Dandy (Magnoliaceae) and the multivariate analysis of Magnolia macklottii complex.
Magnolia section Maingola Dandy, distributed in tropical
Southeast Asia from India (Assam) to Malay Archipelago extending
Borneo, is distinguished from other taxa in Magnoliaceae by the
combination of terminal brachyblast, cylindrical fruit, and free
stipule. Morphological characters were re-examined for section
Maingola and section Alcimandra which has been
considered to be closely related to the former. Although section
Alcimandra is distinguished from section Maingola in
having long stamen to hide gynoecium, section Alcimandra was
combined with section Maingola because this feature is
frequently found in the various taxa of the family. Recent molecular
phylogenetic studies have also demonstrated the close affinity between
sections Maingola and Alcimandra. For the Magnolia
macklottii complex which has been problematic due to the wide
range of variation in taxonomically important characters, principal
component analysis was carried out with the matrix of 52 OTUs X 28
characters. Two varieties, M. macklottii var. macklottii
and M. macklottii var. beccariana, were recognized in
the complex mainly by the presence/absence of hairs in fruits. Leaf
shape and hairs in twig appeared to be variable. In result, seven
species with five varieties were recognized within subsection
Maingola.
Key words: Magnolia macklottii complex, Magnolia section Maingola, Magnoliaceae, taxonomic revision