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Flowering plant in two habitats

02.08.2011 - 09:10 |  Looduskalender
Photo: Arne Ader
Translation: Liis

Pink landscape on Pede river. Amphibious bistort flowering
 
Amphibious bistort; water knotweed: aquatic form
Vesi-kirburohi: veevorm
      
      
Amphibious bistort; water knotweed:
terrestrial form
Vesi-kirburohi: maismaavorm
      
 
The aquatic form is common in freshwater bodies and can even cover shallow waters and bays in great stands. It is a perennial with a long, branched rhizome, that sets roots at stem nodes. It may grow nearly a couple of metres high; the leaves are floating and shiny. The pink inflorescences rise out of the water like candles.
 

In its terrestrial or land variety the plant is often without flowers (when in flower  the inflorescence is similar to the aquatic form), height up to half a metre and the leaves are not like  the floating leaves but smaller and bristly. The terrestrial variety is rarer too.


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