Najas gracillima

Najas gracillima
Conservation status
Least Concern  (IUCN 3.1)[1]
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Monocots
Order:	Alismatales
Family:	Hydrocharitaceae
Genus:	Najas
Species:	N. gracillima
Binomial name
Najas gracillima (A.Braun ex Engelm.) Magnus
SynonymsThe Plant List
Caulinia amurensis (Tzvelev) Tzvelev Caulinia japonica (Nakai) Nakai Caulinia tenuissima subsp. amurensis Tzvelev Najas indica var. gracillima A.Braun ex Engelm. Najas japonica Nakai Najas tenuissima subsp. amurensis (Tzvelev) Vorosch.

Najas gracillima,[2][3][4][5] the slender waternymph,[6] is a submerged species of aquatic plant in the Hydrocharitaceae family.[7] 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).[8][9][10][11]

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.[12] It is listed as endangered in Minnesota.[12] It lives in soft-water lakes and ponds with mud and silt bottoms, and appears to be sensitive to water turbidity, warming, and eutrophication.[12]

References

1. Maiz-Tome, L. (2016). "Najas gracillima". IUCN Red List of Threatened Species. 2016: e.T168711A1213531. doi:10.2305/IUCN.UK.2016-1.RLTS.T168711A1213531.en. Retrieved 20 November 2021.
2. Magnus, Paul Wilhelm. 1870. Beitrage zur Kenntniss der Gattung Najas 23, Najas gracillima
3. Engelmann, Georg. 1867. Manual of Botany of the Northern United States (ed. 5) 681, Najas indica var. gracillima
4. Tzvelev, Nikolai Nikolaievich. 1979. Novosti Sistematiki Vysshikh Rastenii. Moscow & Leningrad 16: 208, Caulinia amurensis
5. Nakai, Takenoshin. 1937. Journal of Japanese Botany 8:853, Najas japonica
6. NRCS. "Najas gracillima". PLANTS Database. United States Department of Agriculture (USDA). Retrieved 16 July 2015.
7. "Najas gracillima (A.Braun ex Engelm.) Magnus". Plants of the World Online. The Trustees of the Royal Botanic Gardens, Kew. n.d. Retrieved September 26, 2020.
8. "World Checklist of Selected Plant Families: Royal Botanic Gardens, Kew". apps.kew.org. Retrieved 2017-01-31.
9. Biota of North America Project, Najas gracillima Image
10. "Najas gracillima in Flora of China @ efloras.org". www.efloras.org. Retrieved 2017-01-31.
11. "Najas gracillima in Flora of North America @ efloras.org". www.efloras.org. Retrieved 2017-01-31.
12. Barbara Coffin; Lee Pfannmuller (1988). Minnesota's Endangered Flora and Fauna. U of Minnesota Press. p. 116. ISBN 978-0-8166-1689-3.

External links

• Photo of herbarium specimen at Missouri Botanical Garden, collected in Missouri