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'Rosa nanothamnus Boulenger' rose Reviews & Comments
Discussion id : 98-261
most recent 30 MAR 17 HIDE POSTS
Initial post 29 MAR 17 by Hortus
Rosa nanothamnus is only referred to as a synonym to Rosa giraldii in "Catalog of Life".

Would not it be appropriate to combine the data on both taxa with HMF?

I would also suggest separating the sterile hybrid form from the Europa Rosarium Sangerhausen / Germany and recording it separately.
Reply #1 of 5 posted 29 MAR 17 by Andrew from Dolton
Some of the pictures of this rose look far taller than the 15 to 50 centimetres in the description.
Reply #2 of 5 posted 30 MAR 17 by jedmar
Rosa nanothamnus Boulenger has been listed as a subform of Rosa giraldii by Brumme & Gladis in the "Wildrosenverzeichnis" of the Rosarium Sangerhausen (p. 95). While we have listed this as a synonym, this publication gives no explanations on why this (and other) regrouping(s) was(were) made, which is a significant deficiency from a botanical viewpoint. It is quite possible that the Brumme & Gladis attributions will be questioned.
Furthermore, there are other varieties of Rosa giraldii, the type being Rosa giraldii var. giraldiii. Therefore it is better to Keep Rosa nanothamnus and Rosa giraldii separate.
Reply #3 of 5 posted 30 MAR 17 by Andrew from Dolton
I see, the whole description is some what confusing, it says "White, near white or white blend Species" then further down says "pink". All the photographs show plants with strong pink coloured flowers.
Reply #4 of 5 posted 30 MAR 17 by jedmar
The original description by Boulenger says "petals pink or white". The ARS colour classes are not always reliable, but are cited here. We have modified HMF's description to pink and white, too, thank you. Please also see the comment by Hortus, that the plant in Sangerhausen is actually a sterile hybrid. It is a general problem that wild roses in many Botanical Gardens are not the type, but some sort of seedlings. We cannot sort this out at HMF, but only show photos from different sites (and hope that some botanist will make a publication on the subject one day).
Reply #5 of 5 posted 30 MAR 17 by Andrew from Dolton
It is a very unusual and interesting rose.
Discussion id : 91-188
most recent 28 FEB 16 HIDE POSTS
Initial post 28 FEB 16 by Hortus
The plant shown here from the Europa-Rosarium Sangerhausen is a sterile hybrid, which was grown from seed more than 40 years ago by Bruno Müller, Palmengarten Frankfurt.
The images from the Palmengarten show the mother plant of the hybrid plant
the Europe Rosarium Sangerhausen.
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