West Highland Flora

Intermediate Water-starwort


Callitriche brutia

 

  Current names (Lansdown 2008) Previous names (Stace 1997) Old names (CTW 1962)
Both taxa together C brutia C hamulata agg C intermedia
The "long-stalked fruits" one C brutia var brutia C brutia C intermedia ssp pedunculata
The "bicycle spanner" one C brutia var hamulata C hamulata C intermedia ssp hamulata

Hope that will sort them out!  The "long-stalked fruits" and "bicycle spanner" are characters that can be used to differentiate the two taxa, but are often not present, see below.
 

Callitriche brutia

Photo Carl Farmer
19 Apr 2003 Glengrasco, Skye

Floating leaves (can be much more oval than this)

Frequent in burns, pools, lochs and rivers.

Submerged leaves c 5-20 mm x 1-2 mm

ID: Submerged* leaves linear, notched and sometimes expanded at tip.  Floating* rosette leaves shorter and broader than submerged leaves.  Opposite leaf-bases smoothly joined across the stem without a gap at the join.

*Note changing water levels can submerge floating leaves and vice versa.

Other features: The fruits are sometimes stalked.  If the stalks are clearly over 2 mm long, you have var brutia, whose fruit-stalks can be up to 12 mm long.  If the submerged leaves have greatly expanded notched tips (like "bicycle spanners"), you have var hamulata.  Very often both these characters are absent, and I would then record the plant simply as C brutia.

 

  Callitriche brutia

Photo Carl Farmer
19 Apr 2003 Glengrasco, Skye

 
     
  Submerged leaves  
     
     
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