Myriophyllum ussuriense

Ussurian water-milfoil

°C
°dKH
Aquarium suitability: yes
Usage: Background, Midground
Difficulty: very easy
Growth: fast
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Range and localities: 

China (Northeast, East, South), Japan, Korea, Russian Far East1; introduced in Western North America (British Columbia, Washington, Oregon)2


Availability [?]: 
  • rarely or not available commercially
  • rarely or not available from other aquarists

Common names: 
  • Ussurian water-milfoil

Synonyms: 
  • Myriophyllum verticillatum var. ussuriense Regel
  • Myriophyllum sp. ''Japan''

Habit, plant type:

  • stem
Botanical name [?]: Myriophýllum ussuriénse Maxim.

Major group (unranked): Seed plants: Flowering plants (Angiosperms)
Order: Saxifragales
Family: Haloragaceae
Genus: Myriophyllum

Description: 

Myriophyllum ussuriense was originally distributed in East Asia. However, it has been introduced to the western part of North America (British Columbia, Washington, Oregon). The species name refers to Ussuri river in Manchuria. This milfoil resembles Myriophyllum verticillatum, which is - amongst others - native to Germany, however, it has only 4 leaves per whorl instead of 5. In nature, it grows in rivers and lakes, where it develops partially submersed, partially emersed flowering shoots.

Ussuri milfoil was imported into Europe over 100 years ago, however, it disappeared from cultivation later on, and was re-introduced to Germany in 1992 under the name Myriophyllum sp. "Japan" by Dennerle company. With the help of its rare flowering shoots, Christel Kasselmann was able to identify this plant as M. ussuriense.
Even though this milfoil is an undemanding and very decorative aquarium plant it is hardly ever found in trade, as it is not very well-suited for emersed propagation as practised by today's aquatic plant nurseries.

- To be continued -

References and further reading:
  1. follows
References (range and localities):
  1. Myriophyllum ussuriense in Flora of China on eFloras.org (accessed 16 March 2013)
  2. Information about Myriophyllum ussuriense from the Washington Department of Natural Resources (http://www1.dnr.wa.gov/nhp/refdesk/fguide/pdf/myruss.pdf, accessed September 2010)
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