Abstract
ABSTRACT: Although a few recent taxonomic studies focusing on infraspecific taxa in each species of Isodon havebeen reported, a detailed taxonomic revision of the Korean Isodon taxa has yet to be performed. We investigated themorphological characters of Korean Isodon based on approximately 600 herbarium sheets from major herbaria inKorea and Japan. We identified characters which distinguish seven Korean Isodon taxa and created a key to KoreanIsodon based on the results from this study and on recent studies of the Korean Isodon taxa. The following uniquecharacters for several taxa were recognized: 1) dense non-glandular hairs in stems for I. inflexus var. canescens (over 70ea/mm on one side of the stem), 2) dense glandular hairs on the abaxial surface of the leaf for I. serra (over 40 ea/mm 2 ),3) protruding pistils and stamens from the corolla with the length of the protruding part longer than that of the lowerlobe of corolla for I. japonicus, and 4) the presence of non-glandular hairs on the entire surface of the fruit of I.inflexus var. microphyllus. Based on this study, we recognized that there are four species, two varieties, and one formaof Isodon taxa in Korea.
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