New records of two alien plants, Juncus torreyi (Juncaceae) and Egeria densa (Hydrocharitaceae) in Korea

IF 0.8 Q4 PLANT SCIENCES
Jongduk Jung, H. Na, K. Lee, Yeongmin Choi, Woon Cho, Jin-Oh Hyun
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引用次数: 0

Abstract

Naturalized populations of two alien plants were newly found, and we describe their morphological characteristics and habitats with photographs. One is a member of Juncaceae, Juncus torreyi Coville, and was newly found at a pool of a beach in Gangwon-do. This rush is native to North America and belongs to the sect. Ozophyllum (subgen. Juncus) according to certain morphological characteristics, such as its racemose inflorescence, the absence of floral bracteole, and unitubular leaves with perfect septa. J. torreyi is easily distinguishable from Korean rushes by its long rhizomes with swollen nodes and globular head with 25–100 flowers. Its introduction into Japan and Europe was reported, but the ecological risk associated with its over-dispersal is not known. The other alien plant is a submerged plant, Egeria densa Planch. (Hydrocharitaceae), which was found in streams in Gyeongsangbuk-do and ditches in the Busan-si area, both of which being in the watershed of the Nakdong River. Egeria densa is similar to Hydrilla verticillata (L.f.) Royle, which is native to Korea. However, it is distinguished from H. verticillata by its larger flowers and lack of overwintering organs. This alien plant is native to South America and was introduced for aquarium gardening and naturalized around the world. Egeria densa is treated as a malignant weed due to its asexual reproduction and rapid growth. Size changes and the number of populations of E. densa must be investigated.
文章标题两种外来植物——锦葵科(Juncus torreyi)和锦葵科(Egeria densa)在韩国的新记录
新发现了两种外来植物的自然种群,我们用照片描述了它们的形态特征和栖息地。其中一个是Juncaceae的成员,Juncus torreyi Coville,是在江原道海滩的一个水池中新发现的。这种热潮原产于北美,属于该教派。Ozophyllum(Juncus亚属)根据某些形态特征,如其总状花序,无花小苞片,和具有完美隔膜的单管叶。托雷伊(J.torreyi)与朝鲜灯心草(Korean rush)的区别很容易,因为它的长根茎有肿胀的节,球形头状花序有25-100朵花。据报道,它被引入日本和欧洲,但与过度传播相关的生态风险尚不清楚。另一种外来植物是一种被淹没的植物,密叶Egeria densa Planch。(水藻科),发现于庆尚北道的溪流和釜山寺地区的沟渠中,这两个地方都位于那克洞河的分水岭。密集Egeria densa与原产于韩国的轮藻Hydrilla verticillata(L.f.)Royle相似。然而,它与轮藻的区别在于其较大的花朵和缺乏越冬器官。这种外来植物原产于南美洲,被引入水族馆园艺,并在世界各地归化。密叶Egeria densa由于其无性繁殖和快速生长而被视为恶性杂草。必须调查密度E.densa的大小变化和种群数量。
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来源期刊
KOREAN JOURNAL OF PLANT TAXONOMY
KOREAN JOURNAL OF PLANT TAXONOMY Agricultural and Biological Sciences-Plant Science
CiteScore
1.50
自引率
40.00%
发文量
23
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