The diagnostic keys in most floras distinguish Catalpa and Paulownia by the position of their leaves. Catalpa: part of the leaves in whorls of three. Paulownia: leaves opposite.
A few days ago I encountered a young Paulownia tree with all leaves in whorls.
The European Garden Flora, vol, VI, p. 344 is the only reference I have found so far admitting Paulownia with leaves "occasionally in whorls".
Without flowers and fruit beginners often mix up Catalpa and Paulownia.
Any experience with Paulownia?
Should the keys in floras be corrected?
See the given link:
https://www.eddmaps.org/ipane/ipanespecies/trees/Paulownia_tomentosa.htm
Dear Klaus Adolphi,
The arrangement of leaves in Paulownia tomentosa is usually opposite, but occasionally also in whorls.
Please have a look at this link
https://www.eddmaps.org/ipane/ipanespecies/trees/Paulownia_tomentosa.htm
Good luck!
We have in Paris Paulownia tomentosa.
And the leaves are opposite.
Thanks to all of you who answered to my question. Paulownia trees in Paris are famous. I expected them to have opposite leaves as all Paulownia trees in Germany that I have seen seem to have opposite leaves except for the one I found in Bochum last Saturday.
Please also have a look at these links and PDF attachment.
http://paflora.org/original/pdf/INV-Fact%20Sheets/Paulownia%20tomentosa.pdf
https://www.bellarmine.edu/faculty/drobinson/RoyalPaulownia.asp
http://bioimages.vanderbilt.edu/vanderbilt/10-62
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