Scottish Rock Garden Club Forum

Plant Identification => Plant Identification Questions and Answers => Topic started by: Leena on February 16, 2019, 09:48:21 AM

Title: Polygonatum roseum?
Post by: Leena on February 16, 2019, 09:48:21 AM

I have gotten this plant in a plant swap as Polygonatum roseum.
What is a difference with P.roseum and P.verticillatum roseum?
These are not very big plants (they grow in a bit too crowded place), maybe 30-40cm tall.

Title: Re: Polygonatum roseum?
Post by: Maggi Young on February 16, 2019, 11:36:13 AM

What I know about these plants  may be written on the head of a small pin - but..... here are
some links that may be  useful -
 Aaron Floden's  thread - Polygonatum, A pictoral guide -
http://www.srgc.net/forum/index.php?topic=2033.0 (http://www.srgc.net/forum/index.php?topic=2033.0)

Aaron's posts on  P. verticillatum  http://www.srgc.net/forum/index.php?topic=2033.msg50232#msg50232 (http://www.srgc.net/forum/index.php?topic=2033.msg50232#msg50232)
 Aaron's  website :
https://sites.google.com/site/polygonatae/ (https://sites.google.com/site/polygonatae/)


The RHS  site states that Polygonatum verticillatum roseum is not a valid name.
 :D ;)

Title: Re: Polygonatum roseum?
Post by: Leena on February 16, 2019, 01:37:04 PM

Thank you Maggi, I should have known there already was an answer in here. :)
So, my plant is not P.roseum.
Here (http://www.srgc.net/forum/index.php?topic=2033.msg59136#msg59136), Aaron writes that P.roseum should have glaucous green stems, and mine has reddish stems. Also there are more than one flower in my plant.

Title: Re: Polygonatum roseum?
Post by: Afloden on April 04, 2019, 01:37:24 PM

The plant in the photo looks like it might be P. kansuense. This one would have scabrous stems and small segmented rhizomes with distinct nodes. Roseum is glaucous with angled stems that are not scabrous.

My most recent phylogenetic paper shows the problems with with the Himalayan verticillatum which is not verticillatum, but a group of morphologically similar, but distantly related species.

Aaron

Title: Re: Polygonatum roseum?
Post by: Leena on April 04, 2019, 06:16:51 PM

Thank you! :) I will have to move it this spring (it is still under snow) to a better place, and I will check the roots then.

Title: Re: Polygonatum roseum?
Post by: Leena on May 28, 2019, 07:08:12 PM

Quote from: Afloden on April 04, 2019, 01:37:24 PM

The plant in the photo looks like it might be P. kansuense. This one would have scabrous stems and small segmented rhizomes with distinct nodes. 

I dug my plant up and moved it to a better place. Here is a picture of it's rhizome. Does it look P.kansuense?

Title: Re: Polygonatum roseum?
Post by: Afloden on June 03, 2019, 04:51:34 PM

The rhizome looks like P. roseum which can be a very vigorous spreading species with terete rhizomes. I have always found it difficult to cultivate because of the heat in my climate.

Title: Re: Polygonatum roseum?
Post by: Leena on June 03, 2019, 05:00:57 PM

Thank you!  :)
After I had moved it I now found it still coming up in it's old place, part of the rhizome must have been broken and left behind.
It obviously likes that place, but it is almost under a small rhododendron and there are also bigger plants in front of it, so I planted the rhizome in the picture  in the front of the shade border, just a few meters from the old place. I hope it thrives there as well.