Monday, April 5, 2010

..... more Spring Greens

Someone asked me a while ago why most spring wild flowers are yellow. Having thought about it for a bit, I'm not sure that's really the case ....... thanks to their sheer numbers, yellow-flowered lesser celandines and primroses are a very conspicuous part of the flora, but there are quite a few green-flowered spring species too. Perhaps the most interesting is Moschatel Adoxa moschatellina, also known as town-hall clock on account of the fact that four of its tiny flowers face outwards, like clock faces on a clock tower. There's also a fifth flower in the inflorescence, that points directly upwards, and one of the unusual features is that the single upward-pointing flower has four petals whereas the four outward-facing flowers have five.
Moschatel is an inconspicuous plant but it's worth taking a close look at the flower with a magnifying glass ..... and taking a sniff. It has a faint musky smell after rain, which is said to attract small flies...although my sense of smell isn't what it once was, and I can barely detect it.
There's nothing faint about the smell of Alexanders Smyrnium olusatrum flowers ...... it's just downright unpleasant and attracts flies. This glossy-leaved umbellifer was once cultivated as a pot-herb and it's quite common around the coast - often near habitation, suggesting a garden origin. Large numbers of plants are coming into bloom on the headland at Tynemouth now, but .....
.. there's a distinct shortage of flies around to pollinate its flowers, although this black ant was attracted by the nectar.
Forty years ago, when I lived in Sussex I used to find spurge laurel Daphne laureola quite frequently in beech woods but up here in Durham it's much less common. There are some plants in Castle Eden Dene and a few in Weardale. Its sweet-scented green flowers attract the first bumblebees to emerge from hibernation and it produces black berries in summer.
Dog's mercury Mercurialis perennis is common everwhere. It spreads via a slow-growing underground rhizome, so large patches tend to be good indicators of old woodlands and hedgerows. There are separate male and female plants, with the former being rather more common.

Like most flowers, even those of dog's mercury become more interesting when you take a close look .... these are the flowers of a male plant, with the anthers shedding pollen, which is carried by the wind rather than by insects.

Sunday, April 4, 2010

Ghosts of 2009..

Down amongst the dead leaves left over from last autumn lie the skeletal remains of last summer's wild flowers. We found this partially decayed seed head of giant bellflower Campanula latifolia in the woodland beside the old railway line that leads to the Nine Arches viaduct in the Derwentside Country Park , where the green shoots of this year's plants are already beginning to sprout.

All the softer tissues in the seed capsules have rotted away, leaving the network of tough-walled xylem vessels - the internal plumbing system that that supplied the developing seeds with water. Double-click for larger, clearer images.

Saturday, April 3, 2010

Elm flowers


Back in the early 1970s we lived in the Midlands for a few years and I can still remember the rows of stately elms whose crowns took on a crimson hue at this time of year as the flower buds on their twigs burst. Those magnificent trees are long gone, thanks to the Dutch elm disease fungus and the bark beetle that spread it from tree to tree, but shrubby hedgerow elm is still common enough. These twigs were just coming into flower in Teesdale earlier this week. Nearby there are also a few largish elms, although I guess the bark beetle will sooner or later find them too.


There are still some mature elms in the UK that have either escaped the fungus or are perhaps immune. The Natural History Museum has been surveying their distribution. You can download a leaflet about their Elm Map Project here.

For more posts on tree ID click here