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black hellebore
black hemlock
black henbane
black hickory
Black Hills
black hole
Black Hole of Calcutta
black Hollander
black horehound
Black horse
black huckleberry
black humor
black humour
black ice
Black Jack Pershing
black kite
-- black knapweed --
black knot
black larch
Black latten
Black lead
Black lemur
Black letter
Black list
black locust
black lotion
black lovage
black lung
black lung disease
black magic
Black mail
black maire
black mallee
black knapweed
Noun
1.
black knapweed
-
a
weedy
perennial
with
tough
wiry
stems
and
purple
flowers
;
native
to
Europe
but
widely
naturalized
Synonyms:
Centaurea nigra
,
hardheads
,
lesser knapweed
Centaurea
nigra
,
hardheads
,
knapweed
,
lesser
knapweed
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