Solvin Zankl / Seed heads of European groovebur (Agrimonia eupatoria) Europe. Burs on the seeds enable hook-and-loop connections between the seed and animal fur or peoples clothes, thus ensuring seed dispersal.

Nigel Cattlin / Branched bur-reed (Sparganium erectum) on canal bank. Berkshire, England, UK. June.

SCOTLAND: The Big Picture / Cow parsley, (Anthriscus sylvestris), growing in unimproved meadow habitat, Scotland, UK, July.

David Woodfall / Dry stone walls in a field of Cow parsley (Anthriscus sylvestris) and Buttercups (Ranunculus acris), New House National Nature Reserve and North Pennine Dales Meadows Special Area of Conservation, Yor...

Colin Varndell / Pirri-pirri-bur (Acaena novae-zelandiae) Studland Heath National Nature Reserve, June. Introduced species.

Paul Hobson / Orange tip butterfly (Anthocharis cardamines) female resting on Cow parsley (Anthriscus sylvestris). Sheffield, England, UK.

Sandra Bartocha / Cow parsley (Anthriscus sylvestris) with Dandelion (Taraxacum officinale) Oland, Sweden

Sandra Bartocha / Cow parsley (Anthriscus sylvestris) Oland, Sweden, May.

Ernie Janes / Red campion (Silene dioica) and Cow parsely (Anthriscus sylvestris) growing at edge of Oilseed rape (Brassica napus) crop field. England, UK.

Adrian Davies / Pirri pirri bur (Acaena novaezelandiae) UK. Invasive species native to Australia and New Zealand.

Adrian Davies / Pirri pirri bur (Acaena novaezelandiae) UK. Invasive species native to Australia and New Zealand.

Will Watson / Marsh Frog (Pelophylax ridibundus) basking on Bur-reed (Sparganium sp.) leaves, flood-plain pool, Stare Okopy, Poland.