Notes on Allium section Rhizirideum (Amaryllidaceae) in South Korea and northeastern China: with a new species from Ulleungdo Island Author Jang, Ju Eun Department of Biology and Chemistry, Changwon National University, Changwon 51140, South Korea Author Park, Jong-Soo Division of Forest Biodiversity and Herbarium, Korea National Arboretum, Pocheon 11186, South Korea Author Jung, Ji-Young Division of Plant Resources, Korea National Arboretum, Pocheon 11186, South Korea Author Kim, Dong-Kap Division of Forest Biodiversity and Herbarium, Korea National Arboretum, Pocheon 11186, South Korea Author Yang, Sungyu Herbal Medicine Resources Research Center, Korea Institute of Oriental Medicine, Naju 58245, South Korea Author Choi, Hyeok Jae https://orcid.org/0000-0001-6315-0071 Department of Biology and Chemistry, Changwon National University, Changwon 51140, South Korea skinh@hanmail.net text PhytoKeys 2021 2021-04-16 176 1 19 http://dx.doi.org/10.3897/phytokeys.176.63378 journal article http://dx.doi.org/10.3897/phytokeys.176.63378 1314-2003-176-1 23DD4AE5061F55CDA95992F080B24A26 Allium senescens L., Sp. Pl. 1: 299 (1753) Fig. 1U-Y Allium pseudosenescens H.J.Choi & B.U.Oh, Brittonia 62(3): 200 (2010). Type: China. Heilongjiang, Tahe, Talin Linchang, H.J.Choi 080119 (Holotype: KH!; Isotypes: KH!). Type . Russia . From Siberia (forebaical region), LINN 419.25 ( Lectotype : LINN photo!). Notes. Allium senescens , originally described from the Baikal area of Russia, is certainly one of the most popular ornamental Allium species of the world, and is naturally distributed in southern Russia, Mongolia and north-eastern China ( Sinitsyna et al. 2016 ; Sinitsyna and Friesen 2018 ). The existing records of this species in South Korea ( Choi and Oh 2010 ; Choi and Oh 2011 ) are all the result of misidentification of herbarium materials, the identity of which we have verified to be A. dumebuchum . Allium pseudosenescens is newly proposed as an additional synonym of A. senescens in this study. Specimens examined. China . Heilongjiang :?, 1959, Wang 163 (PE); Tahe , Talin Linchang , 31 Jul. 2008 , H.J.Choi 080119 (KH); Xifeng Linchang , Tahe , 1 Aug. 2008 , H.J.Choi 080278 (KH); Dashinganryeong , Aug. 1954 , Linxingzu 07577 (PE). Mongolia . Bulgan , Khogno Khaan Mountain Nature Reserve , 29 Jul. 2000 , Sun Byung-Yun 32008 (KH); Sukhbaatar , Tumentsogt , 17 Jul. 2011 , Mongolia _V2012007 (KH); Ulaanbaatar , Sanzai , 09 Jul. 2014 , 2014-MON-010 (KB); Tuv , Mungunmorit , 06 Jul. 2016 , H.J. Choi 160706 * (CWNU); sanzai, 8 Jul. 2014 , 2014-MON-010 (KB).