Photosensitization : causes?

Roger Riordan riordan at
Mon Jan 20 01:06:11 EST 1997

rwhitehead at ("Roger Whitehead") wrote:
>> This phenomenon is also widely known in N Europe.  (Scandinavia).  The
>> culprit there is Heracleum pubescens & H. sphondylium.  (Apiaceae).
>Several of the umbelliferae offend in this respect.  ........
> So, too, do various Citrus species, Scorpion Vetch 
>(Coronilla spp.), Fig (Ficus carica) and, of course, Rue (Ruta 

And, of course, Rhus.  The ornamental varieties are bad - I got a burn
on my arm once, as bad as if I had touched it against my motorbike
exhaust, when I brushed against one while cutting grass with a motor
scythe, but the North American Poison Ivy (also a Rhus) is diabolical.

Roger Riordan.

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