A Good Week

We explored a practically unrecorded tetrad on the Black Mountain last week. The route from where we parked had a lot of good things that could not be completely ignored so it took us until 1230 to enter the area of interest. 

This shows where most of us explored - the river (Afon Gwys) providing the most interest.

Meanwhile intrepid Stephen descended into the steep Afon Giedd valley to explore places like this:

Afon Giedd entering its gorge.

A good haul of records was obtained and both common Cotton-grasses were seen with Hare's-tail Cotton-grass being the most abundant:

Hare's-tail Cottongrass near the Afon Gwys Fawr

Then I heard that Hairy Greenweed (Genista pilosa) was flowering at Ogof Ffynnon Ddu on the limestone pavement. This seems to be a rare occurrence so three of us went there on Friday to check it out. The species is quite rare in the UK with relatively strong populations in Cornwall and Pembrokeshire and only a few other isolated sites in the whole country. (Cadair Idris hosts it also in Wales.) So our population is quite important. We found five patches in all growing and flowering strongly.

Hairy Greenweed (Genista pilosa)

Cold, wet, but worth it

Llangors Lake and its margins often have something new to offer. But the day we chose for this botanical exploration was windy, cold and wet. However the Blackthorn cheered us up.

The group at Llangasty

Ash inflorescences

And Marsh Marish gold (Caltha palustris) is always good to see.

But this: Marsh Lousewort (Pedicularis palustris) was the find of the day - a new record for the area.

A good re-find on our first outing of the year.

Petrosedum rupestre (L.) P V Heath (Sedum rupestre L.) or Rock Stonecrop,  Briweg Felen, isn't thought to be a native in the British Isles these days but J A Webb commented in a draft for a Flora of the county* that Rock Stonecrop was  “almost certainly native and abundant on rocks 40’ high in the Duhonw Glen at Aberduhonw” where A E Wade had first recorded the plant in 1921. (This site is probably Duhonw Rocks SO0348, where it was found by Mike Porter in 1970 and Brecknock Botany Group two days ago.)

The rocks near Llandewi'r Cwm where we spotted the plant. 

A close up picture from Sue Goodhead's camera

New information (20/02/2025): Rev W M Rogers saw it at "Duhonw Glen" in 1898. Probably also the same location.

* This Flora never made it to print...

A few updates

We explored along Sarn Helen starting from Coelbren to get some records from unrecorded areas. The views were also rewarding as we approached the Nedd valley.

This had us stumped - and the online picture ID apps actually helped - a common enough plant but we weren't familiar with the fruits.

Fruits of Sneezewort, Ystrewlys or Achillea ptarmica

And a section of the road where Roman drainage no longer worked yielded this.

Floating Bur-reed Cleddlys arnofiol or Sparganium angustifolium

And here is a lovely view of the Beacons from an unusual viewpoint, Cwar yr Ystrad on Llangynidr Mountain. Anne was exploring another under recorded area.

Photo by Anne Griffiths

A picture gallery

 I wasn't around for a large part of the recent work so here is a gallery of finds since the last blog.

Bee Orchid, Tegeirian y wenynen, Ophrys apifera

Found by Stephen in late June at a new site.

Bog Asphodel, Llafn y bladur, Narthecium ossifragum

Found by Anne at some height.

Marsh Pennywort, Dail-ceiniog y gors, Hydrocotyle vulgaris

It's very rare to see the flowers of this on open display. Group outing.

A conundrum to be looked at again next year. Helleborine, probably Broad-leaved Helleborine, Y galdrist lydanddail, Epipactis helleborine but certainly unusual. Arlene.

Blue Fleabane, Amrhydlwyd glas, Erigeron acris (Erigeron acer)

A new site from Anne.

Bog-rosemary, Andromeda'r gors, Andromeda polifolia

Another new site from Stephen.

Searching and (sometimes) finding

Very briefly - we have been busy and mainly looking for rarities...

We didn't find Annual Knawel, recorded previously on the road up past Little Hill but we think we found the botanically rich area where it used to be. There was an abundance of Slender Parsley-piert though - mainly like the example below and a very few with flowers.

Slender Parsley-piert or Troed-y-dryw main, Aphanes australi

Later in Coelbren we were looking for Samolus valerandii - now twice recorded near our border there. We didn't find it but did get a long list of good things and a better idea of where to continue the search.

Ferns near Ceolbren (Narrow Buckler and Lady)

    

Wild Basil or Brenhinllys gwyllt, Clinopodium vulgare

On a BIS Recording Day near Hay, Claire found Intermediate Enchanter's Nightshade near the Dulas Brook.

And we had a day out with members of the Brecon Beacons Climbing & Mountaineering Club. We all got onto the very tricky crags below Fan Nedd and were able to make new records of plants that grow on them - last recorded in many cases in the 1970s.

I didn't get below the top outcrop - but the younger ones did get to lower and steeper crags.

Ben and Steph on the more accessible crags

Fir Clubmoss or Cnwp-fwsogl mawr, Huperzia selago

Photo by Dorian Thomas

Wilson's Filmy-fern or Rhedynach teneuwe Wilson, Hymenophyllum wilsonii

Crass-leaved Hawkweed, Hieracium inspissatum

Photo by Dorian Thomas

Stopping to let a car pass on the narrow road back resulted in my spotting this from the passenger seat.

Orpine or Canewin, Hylotelephium telephium (Sedum telephium)

It is native but relatively uncommon in the county, occurring sporadically in hedgerows as here.

Finding rare plants

(Rare for our county that is.)

I have been away for much of the time since the last post but that didn't stop the intrepid Brecknock Botany Group members going out and finding things.

Some notable finds:

Chrysosplenium alternifolium (Alternate-leaved Golden-saxifrage)
Lathraea squamaria (Toothwort)
and Wahlenbergia hederacea (Ivy-leaved Bellflower) all near Erwood by Anne Griffiths

Lathyrus nissolia (Grass Vetchling) in Brecon by Joan Millard

Sherardia arvensis (Field Madder) Field edge near Newbridge by Fiona Stone.

Since I came back the main event has been the full confirmation of Circaea alpina at a completely new site on Tarren yr Esgob, right on our border. Sam Thomas took us to it, confirming the difficulty of access and that the population was more extensive and robust than first thought. It is near one of the well-recorded Sorbus stenophylla trees but far enough above on difficult terrain to easily be overlooked. As when Sam first found the site, it poured with rain!

Alpine Enchanter's-nightshade or Llysiau-Steffan y mynydd, Circaea alpina

Picture by Steph Coates

At our BSBI meeting on 13^th July we found several long unseen species at Craig y Rhiwarth, particularly Galium sterneri (Limestone Bedstraw), Convallaria majalis (Lily-of-the-valley) and Polypodium cambricum (Welsh Polypody).

Limestone Bedstraw or Briwydd y calch Galium sterneri

Picture by Tim Oliver