Botanical analysis reports the introduced alien species Chaenorhinum minus in local flora, highlighting morphological traits distinguishing this Plantaginaceae member from related taxa.
Chaenorhinum minus (L.) Lange of the family Plantaginaceae was discovered in Dangjin-si, Chungcheongnam-do, Republic of Korea. This species is an invasive alien plant that originated in Europe and North Africa and that was introduced into North America and East Asia. The genus Chaenorhinum (DC.) Rchb., to which this species belongs, is most similar to Nuttallanthus D. A. Sutton among related genera of the tribe Antirrhineae distributed in the Republic of Korea. While the two genera share common morphological features in the leaf and flower, Chaenorhinum is distinguished from Nuttallanthus by glandular hairs on the plant; monomorphic, fertile, and erect stems; 9.6–14.1 mm long pedicels; corolla as short as 5.6–7.9 mm; white corolla lower lips; and widely ovoid or oblong seeds. This study presents morphological descriptions and a genus key for the tribe Antirrhineae of the Republic of Korea for the identification of C. minus together with distribution information, voucher specimens, and photographs of this species.
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