Najas gracillima,Magnus, Paul Wilhelm. 1870. Beitrage zur Kenntniss der Gattung Najas 23, Najas gracillima Engelmann, Georg. 1867. Manual of Botany of the Northern United States (ed. 5) 681, Najas indica var. gracillimaTzvelev, Nikolai Nikolaievich. 1979. Novosti Sistematiki Vysshikh Rastenii. Moscow & Leningrad 16: 208, Caulinia amurensisNakai, Takenoshin. 1937. Journal of Japanese Botany 8:853, Najas japonica the slender waternymph, is a submerged species of aquatic plant in the Hydrocharitaceae family. found in lakes and streams. It is native to China (Fujian, Guangxi, Guizhou, Hainan, Hebei, Hubei, Jiangxi, Jilin, Liaoning, Nei Mongol, Taiwan, Yunnan, Zhejiang), Russian Far East (Amur and Khabarovsk), Japan, Korea, Taiwan, Iran, Alberta, Ontario, Newfoundland, Nova Scotia, New Brunswick, the eastern United States (every state east of the Mississippi River except Florida, plus Minnesota, Iowa, Missouri and the District of Columbia). It is also considered introduced and naturalized in France, Spain, Italy and California (Plumas and Tehama Counties).Biota of North America Project, Najas gracillima Image
Najas gracillima is a small aquatic annual with branching stems. The unisexual flowers ( each flower is only one sex) are produced in the axils of the branchlets and bases of the leaf sheaths. It is listed as endangered in Minnesota. It lives in soft-water lakes and ponds with mud and silt bottoms, and appears to be sensitive to water turbidity, warming, and eutrophication.
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External links Photo of herbarium specimen at Missouri Botanical Garden, collected in Missouri