Sacha writes
On 2009-06-18 11:46:40 +0100, K said:

I wonder if one can use lemon-scented pelargoniums in the same
fashion?

I did a Google on that and found the page Jennifer had directed us to.
It has a useful bit on scented leaf pelargoniums, including culinary
uses and some strong warnings!
http://www.herbsociety.co.uk/hom-geranium.htm

Thanks!
So as a rough approximation, the answer is 'no' ;-)
(at least as far as the lemony ones are concerned)
--
Kay