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Close-up of closed black alder (Alnus glutinosa) flowers hanging from a tree in autumn. The background is green.
Catkins on a Paper Birch tree in Springtime.
Hazelnut catkins on a branch in winter forest
Birch pollen is very common and is a major cause of allergic rhinitis and, possibly, asthma. The pollen can be carried great distances. Birch pollen allergy is thought to affect approx. 25% of hay fever sufferers.
Small branch of black alder Alnus glutinosa with male catkins and female red flowers. Blooming alder in spring beautiful natural background with clear earrings and blurred background.
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Alder tree fluffy long catkins - spring close up. Bright and textured tree flowers in spring. Copy space for text.
Tree blooming in early spring. Tree buds.
Catkins poplar undiscovered in spring. Populus tremula, aspen is a species of poplar in the rays of the bright sun. Natural phorography.
Hazel (Corylus avellana) männliche Catkins
The young yellow-green blooming long catkins on alder tree (Alnus) branches in early spring season
Sunset shining trough hazel seed and forming sunbeams
Forest in early spring
blooming tree
Tokyo, Japan - March 16, 2022: Flowers of Firma Alder or Asian Alder or Japanese Green Alder or Alnus firma in spring
Spring blooms
Hanging birch male catkins. Ready to cause pollen allergy symptoms
Hazel catkins in winter under a blue sky
a tree with a yellow catkin hanging on the twig
Birch catkins with green leaves on tree branches on a sunny spring day in Denmark. More and more people are getting allergic to birch pollen.
Male Hazel catkins in the spring
These are the male catkins (aments) dangling from the branches of an Italian alder tree (Alnus cordata), isolated against a bright sky. Italian alder is native to Corsica, Southern Italy and Western Asia. Its wood is very rot resistant under water, and may underpin the houses and bridges of Venice. In the UK, it is commonly planted on roadsides (as here), because it grows quickly and is dust-resistant. Close up of male catkins and leaf.
Corylus - a long, spiral flowers wrapped with pollen and growing on a branch
Flowering willow tree in springtime.
An open, self-made herbarium with gray pages. Blossoms from different trees lie in the open book
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A close-up view of catkins of the alder tree during the early springtime season under bright sunlight
Catkins hang from plant stems. Winter morning in Metro Vancouver.
Plenty of birch tree catkins full of polled in them hanging from a birch tree branch in Finland during springtime. The catkins are still green but will soon cause allergy to people. Closeup image.
Deciduous Shrub to 6m, rather upright with smooth brown bark. Leaves rounded, short pointed, toothed, downy. Flowers appearing before the leaves, male catkins yellow, pendent; female flowers tiny, bud-like, with reddish styles.\nFlowering Season: January-March. \nFruit a nut, solitary or several together, each enclosed in a leafy husk, edible.\nHabitat: Woods and hedgerows, to 1800m.\nDistribution: Throughout Europe, except the far north.\nThe wood is used for fencing and basket making.\n\nThese Catkins are one of the first signs of Spring!
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