West Highland Flora

Dutch Rush


Equisetum hyemale

 

Equisetum hyemale

Photo Carl Farmer
1 May 2004 Penifiler

Rare, on wet ground.

Stems to 100 cm high, c 4-9 mm diameter.  Cone c 7-15 mm long.

ID: Stems are unbranched, with rough ribs each having 2 rows of tiny tubercles.  Sheaths without teeth except when very young, but with a wavy edge where the teeth have fallen off.

Other features: Forms very crowded stands that look like rushes, hence its name.  Stems remain green through the winter and into the following spring.  Sheaths eventually become white with a black band at top and bottom.  Stems are slightly constricted at the sheath.  Water Horsetail also has unbranched stems that form large stands, but its stems are extremely smooth whereas those of Dutch Rush are extremely rough (as well as other obvious differences)

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Equisetum hyemale

Photo Carl Farmer
1 May 2004 Penifiler
Start of white sheath to cone tip c 10 mm

Previous year's cone

  Equisetum hyemale

Photo Carl Farmer
1 May 2004 Penifiler
Start of white sheath to cone tip c 14 mm

Current year's cone

 


Equisetum hyemale

Photo Carl Farmer
1 May 2004 Penifiler

 

Equisetum hyemale

Photo Carl Farmer
1 May 2004 Penifiler

 

Equisetum hyemale

Photo Carl Farmer
1 May 2004 Penifiler

Left: part of a typical thicket of stems, which extended much further than in the picture.  Centre and right: Examples of sheaths; in both these the triangular teeth have fallen, as they always do early on, leaving the square-cut ends to the sheath segments.  You can see here how the stems are constricted at the sheaths.


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