Pictorial guide to the flora of the British Isles

Home ⟩ Pictorial Guide ⟩ Rosaceae ⟩ Acaena novae-zelandiae / pirri-pirri bur

Acaena novae-zelandiae Kirk

pirri-pirri bur (Rosaceae)

 SpreadBias within British IslesDirection of bias
RestrictedSlight tendencyE
Plant Atlas 2020
BSBI Distribution Map

Acaena novae-zelandiae is a mat-forming perennial that is native to New Zealand and south-eastern Australia; it is an invasive weed in the British Isles, especially in north-eastern England.

Kyloe (VC68: North Northumberland); 2016-08-04

 pirri-pirri bur / Acaena novae-zelandiae: _Acaena novae-zelandiae_ is a mat-forming perennial that is native to New Zealand and south-eastern Australia; it is an invasive weed in the British Isles, especially in north-eastern England.

Acaena novae-zelandiae has glossy leaves with 5–12 teeth per leaflet.

Oxford (VC23: Oxfordshire); 2015-08-05

 pirri-pirri bur / Acaena novae-zelandiae: _Acaena novae-zelandiae_ has glossy leaves with 5–12 teeth per leaflet.

Flowers

Oxford (VC23: Oxfordshire); 2016-05-29

 pirri-pirri bur / Acaena novae-zelandiae: Flowers

The achenes of most Acaena species have long spines with barbed tips.

Oxford (VC23: Oxfordshire); 2015-08-05

 pirri-pirri bur / Acaena novae-zelandiae: The achenes of most _Acaena_ species have long spines with barbed tips.

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