R. davidii

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MidAtlas
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Re: R. davidii

Post: # 69858Post MidAtlas
Mon May 13, 2019 9:28 pm

I noticed that some of the R. davurica photos on HMF appear to be misidentified, and others are at least questionable--those with obvious R. rugosa characteristics might just be R. x kamtschatica. The straight species as I know it (I'm familiar with one directly wild-collected clone) is upright and fairly thin-caned, too. The Forestfarm plants' images bear a much greater resemblance to that plant than most of the HMF images seem to.

Stefan

jbergeson
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Re: R. davidii

Post: # 69859Post jbergeson
Tue May 14, 2019 9:46 am

And I just noticed the similarity in the names...someone could have scribbled "R DAV" on a tag.

Karl K
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Re: R. davidii

Post: # 69861Post Karl K
Tue May 14, 2019 11:45 am

tsilvers wrote:
Mon Apr 29, 2019 6:35 am
found another old picture of the rose purchased as davidii from ForestFarm
Slide4.JPG
whatever it is, I've been enjoying working with it! :)
Tom,
I won't try to identify a species from a couple of pictures, but your "davidii" sure looks like the Rosa palustris plena I photographed at the San Jose Heritage.
Image
And more pics:
http://bulbnrose.x10.mx/Roses/Rose_Pict ... plena.html
Karl

tsilvers
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Re: R. davidii

Post: # 69862Post tsilvers
Tue May 14, 2019 4:01 pm

Hi Karl,
I just planted palustris scandens. Is this the same as plena???
Whatever the case, the ForestFarm "davidii" is VERY different from scandens and both other collected palustris that I grow (one from very close to home and the other from about 4 hours east). It's also very different from all of the North American tetraploids I've grown.
You're so right, that it's very tough to ID from pictures. But in spite of the difficulty, I'll still try to get some better pictures to add to this puzzle. ;)
Thanks, Tom

Karl K
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Re: R. davidii

Post: # 69863Post Karl K
Tue May 14, 2019 5:35 pm

tsilvers wrote:
Tue May 14, 2019 4:01 pm
Hi Karl,
I just planted palustris scandens. Is this the same as plena???
Tom,
I just looked up scandens on HMF. It does look like plena, but I won't express an opinion without seeing them together.

The San Jose Heritage garden is not even vaguely swamp-like. It is hot in the summer. The plants are irrigated, but palustris plena got no more water than other roses, so far as I could tell.
Karl

Karl K
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Re: R. davidii

Post: # 69947Post Karl K
Fri May 31, 2019 5:14 pm

Here is a comment about R. carolina that might be useful.

Bull. Torr. Bot. Club 14(12): 253-256 (Dec 1887)
Remarks on the Group Carolinae of the Genus Rosa
By G. N. Best, M.D.
The mature fruit has not received the attention it deserves; likewise the seed. I am satisfied that from them both important aids can be derived in the differentiation of species. In the early part of winter the hips of Rosa Carolina wither and wrinkle, forming a short but distinct neck; the remaining species of the group Carolinae, on the other hand, so far as my observation goes, continue plump until the following spring. By this character alone, and especially when taken conjointly with the seed, which is smaller than in either of the other species, Rosa Carolina may be known even when divested of flowers and leaves. In like manner, as the result of close study, the fruit and seeds may afford the means of distinguishing other species and putting them on a more permanent basis.
http://bulbnrose.x10.mx/Roses/breeding/ ... s1887.html

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