Pictorial guide to the flora of the British Isles

Home ⟩ Pictorial Guide ⟩ Acoraceae ⟩ Acorus calamus / sweet flag

Acorus calamus L.

sweet flag (Acoraceae)

 SpreadBias within British IslesDirection of bias
WidespreadModerate tendencySE
Plant Atlas 2020
BSBI Distribution Map

Acorus calamus is an Asian–North American species introduced to waterways across the British Isles; its leaves generally have transverse wrinkles, but this can also occur with other taxa with similar leaves.

Oxford (VC23: Oxfordshire); 2015-06-24

 sweet flag / Acorus calamus: _Acorus calamus_ is an Asian–North American species introduced to waterways across the British Isles; its leaves generally have transverse wrinkles, but this can also occur with other taxa with similar leaves.

The flowering spadix is rarely produced in the British Isles, and fruit are unknown here.

Oxford (VC23: Oxfordshire); 2015-06-24

 sweet flag / Acorus calamus: The flowering spadix is rarely produced in the British Isles, and fruit are unknown here.

All images copyright © Christopher J. Dixon unless otherwise indicated.

L-R: Bidens tripartita, Melilotus officinalis, Mimulus guttatus, Thalictrum flavum, Ranunculus peltatus, Anchusa arvensis, Malva alcea, Lolium perenne