North American Rose ID?

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matt lustig
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North American Rose ID?

Post: # 70815Post matt lustig
Fri Jan 03, 2020 11:43 pm

Do we know of anyone, whether on this forum or in academia, who is able to reliably identify North American species roses either through close-up photographs or leaf/stem/flower samples? Among my various roses I have 2 wild species (or potentially naturally-occurring hybrids), one clone each collected in New York and Pennsylvania. I have tentatively "identified" each species, but my identification is pretty uncertain (and partly based upon collection locations/habitats, which is hardly a strong diagnostic strategy). Do we know of anyone skilled in such identification?

Regards,
Matt

david zlesak
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Re: North American Rose ID?

Post: # 70816Post david zlesak
Sat Jan 04, 2020 10:40 am

Dear Matt,

That is a great question. If you post pictures, hopefully some of us can help you the best we can. Dr. Walter Lewis is the foremost expert. Here is a link to part of the Flora of North America Rosa section he put together. There is a series of books and he put together the Rosa section which I think is in the same volume with Rubus. Here is a link to some nice species descriptions on the publisher's website. http://www.efloras.org/browse.aspx?flor ... _id=128746

I tried to reach out to Dr. Lewis this past year, but haven't heard back. He is around 90 and I hope he is doing okay. He has helped me in the past.

Take care,
David

matt lustig
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Joined: Sat Jan 28, 2017 10:05 pm
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Re: North American Rose ID?

Post: # 70834Post matt lustig
Tue Jan 07, 2020 4:26 pm

Thank you! I was unaware of the rose key that you linked--that's great. I'll also plan to post pictures this summer/fall.

Sincerely,
Matt

MidAtlas
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Re: North American Rose ID?

Post: # 70961Post MidAtlas
Tue Jan 21, 2020 10:15 pm

Hi Matt,

For another modern reference, you might also want to look at Systematic Botany (2007), 32(4): pp. 819–836. Delimiting Species Boundaries in Rosa Sect. Cinnamomeae (Rosaceae) in Eastern North America, by Simon Joly and Anne Bruneau. The data they present shed some light on the variable hybrid origins of some polyploid species in this complex; that certainly helps to explain why it can be so challenging to clearly identify (or even circumscribe) certain of these species at times. They also provide a key:

https://www.webdepot.umontreal.ca/Usage ... ystBot.pdf

Also see this related paper:

http://www.plantevolution.org/pdf/Joly& ... AmJBot.pdf

Stefan

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