Small White

Small White, Pieris rapae, laying an egg.   Riverside Country Park, 10 August 2012

While I was looking through my Riverside Country Park photos I was reminded of this Small White.  The other members of the group, being botanists, were looking at something else (and I didn't ignore that - it was the Sea-spurrey in my last post) ,  but butterflies always catch my eye and I spotted this to one side.  Small Whites lay single eggs on plants related to cabbages, like this wild crucifer.   This includes the Nasturtiums in your garden, though there you are more likely to find a big cluster of Large White eggs.  

This one is actually in the process of laying an egg, and though you can't see that one, another is visible, at the very top of the photo a little from the right.  

Seaside Succulents

Sea Beet, Beta vulgaris.  Riverside Country Park, 10 August 2012

This is going back in time a bit, to August, a set of photos that I have only blogged a couple of moths from.  But it's interesting and I don't want it to get lost.  I am going to show details of four plants that grow right by the sea, close enough to be wet by salt spray and maybe even have waves wash over them sometimes.  The first one is Sea Beet, a close relative to sugar beet.

Annual Sea-blite, Suaeda maritima.  Riverside Country Park, 10 August 2012

The next is Sea Blite, a quite different plant despite the similarity of the names.

Golden Samphire, Inula crithmoides.  Riverside Country Park, 10 August 2012

These Golden Samphires were in full flower, and looking very pretty.  I was at Riverside Country Park, near Gillingham in Kent, on a field trip with my wildflower class and a very knowledgeable teacher, so I am quite confident of the names of these plants even though I had never seen them before.

Greater Sea-spurrey, Spergularia media.  Riverside Country Park, 10 August 2012

Despite its name, the Greater Sea-spurrey is quite a small, low-growing plant.

I have shown these together because they all have a certain similarity.  They have waxy-looking, more or less succulent leaves.  Why should it be that they have the same sort of look as desert plants, when they are right next to the most water they could possibly find?   Well, salt water is a very unfriendly environment for land plants.  They find it hard to separate the water from the salt.  And then, the shoreline above sea level can sometimes be very dry, rather like a desert, because the sandy soil drains so freely.  Between these two factors, the plants need to hang on to all the salt-free water they get, and store it up when they have an excess.

To prove that it's not just the dryness of sandy soil that makes this a useful adaptation, here is a Glasswort.

Glasswort.  Riverside Country Park, 10 August 2012

This grows in a salt marsh and always has its roots in the water.

Saltmarsh Plume

Saltmarsh Plume, Agdistis bennetii.  Riverside Country Park, 10 August 2012.

I said last time that Plume Moths rolled up their wings when at rest.  This is yet another species, an unusual one that lives only on salt marshes, and I have a couple of photos that show the rolling very clearly, quite distinct from any folding action.

The first photo shows the moth in the marsh.  It was very hard to see, resting in a Y-shaped posture rathet than the T shape adopted by most Plumes and looking just like a small twig, an extension of the plant.  If I had not watched it fly up and land I would probably not have seen it.  As it was, I knew where to look more closely.

Saltmarsh Plume, Agdistis bennetii.  Originally from Riverside Country Park, 10 August 2012.

Here is it on measuring paper.  The squares are 5mm across.  And now you can see the rolling of the near wing very clearly, even though that wing is a little out of focus due to the limited depth of field in this sort of photo. 

And now you have a good example of the sort of thing I find interesting!