ar8922's picture

Marsh Lousewort?

Observed: 12th May 2013 By: ar8922
S159 Neighbourhood Nature - course complete
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Description:

I'm reliably informed this is Marsh Lousewort rather than 'common' Lousewort and it's certainly in a very wet moorland environment but from this single poor photo (sorry), is anyone able to confirm that.

Identifications
Species interactions

No interactions present.

Species with which Lousewort (Pedicularis sylvatica) interacts

Comments

cerigait's picture

Downy Calyx

P paulustris usually has 5-9 flowers and P. sylvatica 4-7. i think there are 9 flowers and buds on this plant.

Even though it appears to be wet in the photo, I think the Calyx appears quite downy and the upper lip is arched and flattened on each side, so I think this is probably P paulustris.

ar8922's picture

Downy Calyx

Many thanks Ceri, some useful tips there.

AlanS's picture

Not downy enough

The calyx of P. palustris is very conspicuously downy with spreading hairs. The photograph here is very typical P. sylvatica.

The calyx of P. palustris is also a different shape, less elongated.

Alan

cerigait's picture

P. sylvatica = Hairless?

I'd ruled out P.sylvatica as it is noted in bold print as hairless in my key in Francis Rose, and in "Stace" the Calyx is glabrous... and I thought I can see hairs on the calyx in the picture.

I agree it does look similar to pictures of P.sylvatica. Is it possible to have hairs?

I don't have a great deal of experience with this plant, and am happy to stand corrected. :)

Thanks

Ceri

AlanS's picture

hairs

There are often a few, stiff hairs on the angles of the calyx in Pedicularis sylvatica subsp. sylvatica, the common plant. These are what can be seen in the photograph. The faces of the calyx are glabrous.

The whole calyx is clothed in white hairs in Pedicularis sylvatica subsp. hibernica, which is to be found in Ireland, in the Hebrides and very rarely, as I recall without checking, on the West Scottish mainland.

Alan