100 植物研究雑誌　第 91巻　第 2号 2016年 4月

J. Jpn. Bot. 91: 100–104 (2016)

Aijaz Hassan Ganie*, Ayaz Bashir, Anzar A. Khuroo, Bilal A. Tali, Zafar A. reshi, Manzoor A. shah and B. A. Wafai: A New Record of an Invasive Aquatic Plant Hydrocharis morsus-ranae (Hydrocharitaceae), Reaching to the Kashmir Himalaya

Department of Botany, University of Kashmir, Srinagar, 190 006, Jammu & Kashmir, INDIA*Corresponding author: aijazku@gmail.com

Summary: Hydrocharis morsus-ranae L. (Hydro-charitaceae) is newly reported from the Kashmir Himalaya, India. This invasive aquatic species was collected from two localities, Miragund and Haigam wetlands. Besides biogeographical aspects, possible plant invasion risk and management implications of this species are discussed.

The genus Hydrocharis L. (Hydro-charitaceae) is widely distributed in tropical and temperate regions of the old world (Cook and Lüönd 1982), and comprises three species, H. dubia (Blume) Backer, H. morsus-ranae L. and H. chevalieri (De Wild.) Dandy. Biogeographically, these three species show allopatric distribution with H. dubia restricted to South and East Asia, H. morsus-ranae to West and North Eurasia and H. chevalieri in Central Africa (Cook and Lüönd 1982).

In the Kashmir Himalaya, a biodiversity-hotspot region in Indian subcontinent (Dar et al. 2002), only H. dubia has been reported (Stewart 1972, Kak 1990). Previously, Kaul and Zutshi (1967) erroneously reported H. morsus-ranae from India, as a synonym of H. dubia, which is incorrect as the two are distinct species.

During floristic surveys in the Kashmir Himalaya in 2013, we collected H. morsus-ranae in two places (Fig. 1). It is the first report of this species in the entire Himalayas and its adjoining regions.

Hydrocharis morsus-ranae L., Sp. Pl. 1036 (1753). [Fig. 2]

Vernacular name: Lakut Batae-Khor.Specimens examined: INDIA. Jammu & Kashmir,

Baramulla: Haigam wetland, (A. H. Ganie, A. Bashir & A. A. Khuroo 9021, 27 Aug. 2013, KASH); Miragund wetland (A. H. Ganie, A. Bashir & A. A. Khuroo 9022, 3 Sep. 2013, KASH).

In Kashmir Himalaya H. morsus-ranae and H. dubia grow sympatrically in Miragund and Haigam wetlands. Hydrocharis dubia mostly reproduces by vegetative means. To delimit these closely related species, the diagnostic

Fig. 1. Distribution of Hydrocharis morsus-ranae in the Kashmir Himalaya.

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A. H. Ganie，A. Bashir，A. A. Khuroo，B. A. Tali，Z. A. reshi，M. A. shah，B. A. Wafai：Hydrocharis morsus-ranae（トチカガミ科）がカシミール・ヒマラヤに侵入　トチカガミ科のトチカガミ属 Hydrocharisは浮葉植物で，H. chevalieri (De Wild.) Dandy，H. dubia (Blume) Backerトチカガミ， H. morsus-ranae L.の 3種からなる．インドのカシミール・ヒマラヤではこれまでトチカガミのみが知られていたが，2013年になって初めて H. morsus-ranaeが見出された．この侵略的な水生植物は

カシミールのMiragundと Haigamの二ヶ所の湿地で得られている．H. morsus-ranaeはヨーロッパ西部や北部原産の種で，既に北アメリカに帰化し，分布域を拡大しているという報告がある．南アジアや東南アジアでも本種の侵入に注意する必要がある．（インド・University of Kashmir, Department of Botany）