In message , K
writes
Stewart Robert Hinsley writes
I was asking about a plant that I'd seen in a garden a while back. It
was suggested that it was a white form of Geum rivale. Kay convinced
me that it wasn't, but I was still willing to consider the possibility
of another species or hybrid of Geum. Kay also found what she thought
was the same growing wild on limestone in Yorkshire.

Except that mine *was* Geum rivale, just a different form, growing in
an open rather than shaded habitat. (I don't know what colour the
flowers were, but I did have the fruits)


On Sunday I revisited the garden, and found the plant in fruit. It has
fleshy fruits, and is obviously not a Geum. Related plants with fleshy
fruits are Fragaria and Rubus, but I don't find a good match in either
genus.

Rubus saxatilis Stone bramble, though the petals are too wide for that.
Otherwise - a Swedish member of urg gave me a similar Rubus species,
which unfortunately I no longer have, which may have been stone bramble
or may have been something else. She told me it was used for jam in
Sweden

Stace says that the fruit of Stone Bramble is composed of from 1 to 6
drupes. There are 11 drupes visible in the photograph of the fruit, and
we can infer that there are more hidden from view.

Otherwise, this plant has solitary flowers. Rubus saxatilis is said to
have flowers in corymbs (like other Rubi) of 3-15.

As you say, this plant has broad petals, but Rubus saxatilis has narrow
petals.

This plant has sepals as long or longer than the petals. Rubus saxatilis
has small (3-5 mm) sepals.

It's difficult to compare with the difference in the number of drupes,
but the swollen receptacle doesn't seem to match either.

The fruits match Rubus tricolor (Chinese creeping bramble), but the rest
of the plant doesn't. (Rubus tricolor has simple leaves, and compound
inflorescences.)

It has the inflorescence of cloudberry (R. chamaemprus), the leaves of
stone bramble (R. saxatilis) and the fruit of Chinese creeping bramble
(R. tricolor). I think we can deduce that it is a Rubus, but I'm still
baffled as to which species.
--
Stewart Robert Hinsley