Stewart Robert Hinsley writes
In message , Neil Jones
writes
I saw a roadside Sorbus tree today. Of the Mountain Ash type.

The berries were yellow and the leaves were a delightful reddish brown.
It was quite striking.

Can anyone suggest which species it was?

There's a lot of different rowans. (50 species or so, IIRC.) However
one of the yellow-fruited forms is the cultivar 'Xanthocarpa' of the
native Sorbus aucuparia. But the specimen I photographed last month at
NT Wallington is more orange- than yellow-fruited.

I've been through my digital image collection, and other yellow-fruited
forms are Sorbus 'Sunshine' (also somewhat orange) and Sorbus 'Joseph
Rock'.

Joseph Rock is very upright in growth. If Neil saw the same type as I
noticed over the weekend, it's a much more rounded shape. Quite
spectacular, an overall image of red, embedded with clusters of pure
yellow fruits.
--
Kay