• Korean Journal of Plant Taxonomy
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• v.35 no.3
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• pp.201-209
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• 2005

Two new naturalized species, Amaranthus hybridus and Crepis tectorum, are reported here. Descriptions and illustrations of the species and comparison of morphology with related species are provided. Amaranthus hybridus was first found at Nanjido, Seoul and is widely distributed in the central and southern part of Korean peninsula. New Korean name is given as "Ginteolbireum". It is well distinguished from the related species, A. retroflexus and A. patulus, by its late flowering time (September to October), sparse hair on the leaves, similar length between tepal and fruit, and long inflorescence without division. Crepis tectorum was first found at the entrance of Weoljeongsa Temple in Pyongchang-gun, Gangwon-do and spreads rapidly to other areas. New Korean name is given as "Nadomindulle".

• Korean Journal of Plant Taxonomy
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• v.44 no.2
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• pp.132-135
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• 2014

A newly naturalized plant, Amaranthus powellii S. Watson was found Jail-dong, Uijeongbu-si, Gyeonggi-do, Korea. This species is native to Southwestern USA and Northern Mexico, and it is also naturalized in worldwide of temperate regions. This species was distinguished from the related species, A. patulus Bertol. and A. hybridus L., by leave blades broadly elliptic, rhombic or lanceolate, petals unequal, without conspicuous green mid-veins, and utricle gradually narrowed toward the stigma. Korean name was given as 'Min-teol-bi-reum' to A. powellii S. Watson, based on the character, it was hairy less than the three related species, A. patulus Bertol., A. hybridus L. and A. retroflexus L., conspicuously. Descriptions for mophological characters, photographs, illustrations and keys to allied taxa were provided.