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Yellow Toadflax
(butter-and-eggs) Scrophulariaceae,
the figwort family
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Background
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 Yellow
toadflax is likely an escaped ornamental brought to this country from
Europe. It spreads both by seed and roots. This weed contains a poisonous glucoside that may be harmful to livestock. Yellow
toadflax grows under a wide range of environmental conditions.
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Description
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Yellow toadflax is a perennial with narrow, nearly
opposite, 2-inch long leaves. Stems are smooth, generally unbranched, and up
to 3 feet tall. T he showy snapdragon-like flowers are about 1 inch long
(excluding the 1/2-inch spur), yellow with an orange throat and bloom from
summer to fall. Seed is produced in brown, globe-shaped capsules. Seeds are
round, dark colored with notched, papery collars that act as wings in
spreading the seed.
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Distribution
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Yellow toadflax is found throughout the U.S. and in nearly all areas except
western and south-central Idaho counties.
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Control
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Biological control agents (a defoliating moth, a seed head weevil, and a
flower beetle) provide fair control of yellow toadflax. Herbicides are also
available.
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© 1999 University of Idaho:
Text and photographs for these pages from Idaho's Noxious Weeds, by
Robert H. Callihan and Timothy W. Miller (revised by Don W. Morishita
and Larry W. Lass).
Please contact: Ag Publishing, University of Idaho, Moscow,
Idaho 83844-2240; 208 882-7982 visit the Resources for Idaho website at
http://info.ag.uidaho.edu, for more information about this or other
publications.
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