USDA
Code:
HITR
Legal Status:
Colorado
List B Noxious Weed
Family:
Malvacaea (Mallow)
Lifecycle:
Annual
Growth
form: Forb
Flower:
Flowers are a light sulfur-yellow color with a red to purple
center. Flowers
only last a couple of hours, hence the nickname, “flower
of an hour”.
Seeds/Fruit:
Seeds
are dark brown and can remain dormant for 50 years.
Leaves:
Alternate, divided into 3
to 5 distinct lobes. Margins on the lobes are
toothed.
Stems:
Erect, hairy, and branch from the base.
Roots:
Shallow taproot with a fibrous system.
Seedling:
Cotyledons
are round with hairy petioles. First true leaves have
toothed margins and are alternate.
IMPACTS
Ecological:
Primarily
a weed of nurseries, orchards, roadside fields, and
open waste areas.
HABITAT
AND DISTRIBUTION
General
requirements:
Venice
mallow is drought
tolerant, can grow in acidic soils and in
gravely soils.
Distribution:
Throughout
the
U.S.
Historical:
Introduced
from
Europe
.
REFERENCES
Whitson, T.D.(ed.), L.C. Burrill, S.A. Dewey, D.W. Cudney,
B.E. Nelson, R.D. Lee, R. Parker.
5th Edition 1999. Weeds
of the West. Western
Society of Weed Science, in cooperation with the Western
United States Land Grant Universities Cooperative Extension
Services,
Newark
CA
Westra, P., C. H. Pearson, R. Ristau, and F. Schweissing.
1996.
Venice
mallow (Hibiscus trionum) seed production and persistence in
soil in
Colorado
. Weed Tech.
10:22-28.
Westra, P., C. Pearson, and R.J. Ristau.
1990. Control
of Venice Mallow (Hibiscus trionum) in Corn (Zea mays) and
Onions (Allium cepa). Weed Tech. 4:500-504.
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