Spring Stirring?

Teesdale: Goat willow bud scales beginning to lose their grip ........

Ryton Willows Nature Reserve, Newburn, Tyne Valley: reedmace seed heads breaking up and sheding seeds

Our garden, Co. Durham: First lesser celandine bloomed today

Teesdale: Hedge sparrow singing, volume turned up to 11, in foul weather

Teesdale: New fronds unfurling on maidenhair spleenwort fern

Hawthorn Dene, Durham coast: Fabulous display of snowdrops today

Some early spring wild flowers

Lesser celandine

Coltsfoot

Primrose

Dog violet

Forget-me-not....

Dog's mercury......

Dog's mercury has blue pollen

 Spurge laurel ...........

Golden saxifrage

Moschatel (aka town hall clock) 

Goat willow (aka sallow)

Toothwort 

A Tree-Spotter's Guide to Flowers: 2

Many trees produce their flowers in elongated catkins in spring, often before the foliage expands. Most - but not all - catkin-bearing trees are wind pollinated and produce vast quantities of pollen to ensure that pollination and seed set occurs. Hazel catkins are the most familiar ....

... along with alder catkins. Alder is usually the first tree to flower in spring.

Male catkins of hornbean are smaller than those of most other trees and produced just before the leaf buds open.

Silver birch male catkins are long and slender. The female catkin, seen here just above the leaves, is much smaller and points upwards. It will produce large quantities of seeds in winter, which are important food for finches.

Silver birch tree in full flower, in April.

There are separate male and female trees of goat willow (also known as sallow). This is the female catkin, with large numbers of stigmas. After pollination it'll produce masses of downy seed in early summer. Unlike all the other trees in this post, goat willow is pollinated by insects - flies, bees and butterflies - and both male and female trees are sometimes visited by blue tits that also have a liking for nectar - so this may be the only tree species in Britain that's pollinated by birds.

Male goat willow catkins, beginning to expand their golden stamens.

A male goat willow tree in full flower in late March can light up a hedgerow - and is an important source of nectar and pollen for the first insects that emerge in spring.

Poplar catkins are seldom seen (unless you go tree-spotting with binoculars) because they are produced right at the top of mature trees, but they are often the most attractive flowers of all the wind-pollinated species. They are much stouter that catkins of other trees. The best time to look for them is after a spring gale, when they are often broken off and litter the ground under the tree.

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Is Sallow Britain's only Native Bird-Pollinated Plant?

It’s been a slow spring in North East England and there still aren’t many flowers around, so the blooming of sallow catkins must provide a real lifeline for newly emerged pollen-eating insects like this hoverfly. Sallow – aka goat willow, aka pussy willow – is unusual in that it exists as separate male and female trees and pollen must be transferred between the two - which may be some distance apart - for seeds to be produced. Catkins of both sexes produce nectar, which is what attracts butterfly and bee pollinators, but it’s mainly pollen that most hoverflies are looking for; visiting and cross-pollinating female trees isn’t high on their agenda.

But blue tits are attracted by the nectar too and they visit trees of both sexes. Quentin Kay at Swansea University first noted this, back in 1985 (you can read his original research paper in Bird Study here) and it may be that goat willow is our only native bird-pollinated plant. Bird pollination is common in the tropics and sub-tropics, where hummingbirds have become nectar specialists, but it’s rare in cooler climates.

For more posts on tree ID click here

A Tree-Spotter's Guide to Buds: part 4

Aspen Populus tremula twigs are tipped with these sharply pointed buds that sometimes have a slight stickiness about their bud scales. This is quite common in poplar species and is most pronounced in balsam poplars, where the resin that's responsible has a wonderful fragrance. Poplars have a tendency to hybridise, sometimes making identification tricky, but aspen is easy to identify when it's in leaf because of a peculiarity of the leaf stalks; they're flattened from side to side, so the leaves tremble from side to side in the slightest breeze - hence the Latin epithet tremula. They also turn a wonderful shade of lemon yellow in autumn, and the sight of a whole tree of lemon yellow foliage trembling in the wind is something to behold.

Apple Malus domestica buds are blunt and downy, with few bud scales. The knobbly, scarred twigs have a character all of their own, especially........

...in old trees that have acquired their own epiphytic flora of lichens. Old orchards, now fast disappearing, are wonderful resources for people and wildlife and their cause has been vigorously championed by that admirable organisation Common Ground - see http://www.commonground.org.uk/

Most hedgerow apples are likely to be descendants of discarded cores of domesticated apples, rather than the native crab apple Malus sylvestris

The buds on the main twigs of wild cherry or gean Prunus avium are not particularly distinctive but a little way down the twig from these you'll find....

... the fruiting spurs that will carry those clusters of dazzling white flowers in spring - and in summer the cherries. Over the last couple of years I've tasted quite a lot of wild cherries and this particular tree bears unusually juicy and large deep red fruits, that make excellent cherry sauce for pouring over ice cream. Unfortunately, someone else has made the same discovery and this year raided all the low branches on the tree before I could get to it. All I can say is that I hope they suffered the same fate as the badger that had over-endulged in the fallen fruits: the ground nearby carried the purplish-red telltale signs of a badger with a severe stomach upset, along with a mass of cherry stones that had passed unharmed through its digestive system.

Sallow (aka pussy willow aka goat willow) Salix caprea carries green buds with no apparent bud scales, The single scale that sheaths the whole bud deepen in colour through the winter, taking on a brownnish hue, and when the leaf and flower tissue inside swells in spring the whole covering is shrugged off.

For part 3 see http://cabinetofcuriosities-greenfingers.blogspot.com/2009/12/tree-spotters-guide-to-buds-part-3.html

For more posts on tree ID click here