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Home :: Weed Department :: Noxious Weeds » Poison Hemlock

Poison Hemlock
Apiaceae (= Umbelliferae), the parsnip family

Background

Poison HemlockPoison hemlock is native to Europe. It contains highly poisonous alkaloids toxic to all classes of livestock and humans. It has poisoned many who have mistaken it for parsley. Poison hemlock is often found on poorly drained soils, particularly near streams, ditches, and surface water.

Description

Poison HemlockPoison hemlock is a biennial that grows up to 10 feet tall. Stems are stout, hollow, ridged, and mottled with purple spots. Leaves are shiny green, 3 to 4 times pinnately compound, and clasp the stem at the obvious nodes. Crushed foliage has a disagreeable, mousey odor. Flowers are small, white, and borne in umbrella-shaped clusters about 3 inches across in early summer. Seeds are ridged and flattened, with 2 seeds borne together. The plant has a thick, white taproot.

Distribution

Poison Hemlock distribution mapIt grows throughout the U.S. except from eastern Montana to northeastern Minnesota and south to Nebraska. It has an extensive presence in Idaho.

Control

A biological control agent (a defoliating moth) provides good to excellent but inconsistent control. Herbicides are also available.

 

© 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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Home :: Weed Department :: Noxious Weeds » Skeletonleaf Bursage

Skeletonleaf Bursage (bur ragweed, silverleaf, povertyweed)
Asteraceae (= Compositae), the aster family

Background

Skeletonleaf Bursage Skeletonleaf bursage is native to the Great Plains region. It spreads both by seed and creeping roots, keeping primarily on, but not limited to, dry or poorly drained sites.

Description

Skeletonleaf bursage is a perennial up to 3 feet tall. Leaves are alternate, up to 5 inches long, and very deeply lobed with coarsely toothed margins. The lobes are reduced in size from leaf base to tip. The upper leaf surface is Skeletonleaf Bursage greenish gray and may have rough hairs; the lower surface is white with short, dense hairs. Flower heads are 1/4 inch wide and are produced from June through August. Each head contains inconspicuous yellow flowers that are either male or female (not both). Fruits are 2-seeded, light brown burs with up to 10 short spines. The plant has extensive horizontal roots.

Distribution

Skeletonleaf Bursage distribution mapSkeletonleaf bursage occurs from the desert Southwest to Wisconsin and Illinois and in these indicated Idaho counties.

Control

No biological control agents are available for skeletonleaf bursage, but herbicides are available for control of this weed.

© 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.

 

 

 

-- Home :: Commissioners :: Departments :: Judicial ::Services ::  Links --

-- Commissioners' Proclamation --
-- Terms of Use --
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©2010 Minidoka County, Idaho
- Web Site by Surf The Snake -