Abstract
Herbarium specimens (over 400) of all the 64 species of
Alyssum
listed in the
Flora Europaea
were analysed for their nickel and cobalt content in order to identify hyperaccumulators ( > 1000 μg/g dry mass) of either element. In addition to the three previously recorded hyperaccumulators of nickel (
A. bertolonii
,
A. murale
and
A. serpyllifolium
s. sp.
lusitanicum
), a further 11 were identified. With the exception of
A. fischerianum
, all hyperaccumulating species are from Section Odontarrhena of the genus and include
A. alpestre, A. argenteum, A. corsicum, A. euboeum, A. fallacinum, A. heldreichii, A. markgrafii, A. robertianum, A. smolikanum
and
A. tenium
. Nickel contents exceeding 10000 μg/g (1%) were recorded in
A. bertolonii, A. corsicum, A. heldreichii, A. markgrafii
and
A. robertianum
. The occurrence of 14 hyperaccumulators in a single genus is the highest density so far recorded and poses interesting questions concerning the plant chemistry of these species.
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