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 Plants Liz Makings @http://swbiodiversity.org, Usage Rights: Creative Commons Attribution-ShareAlike (CC BY-SA) |  Leaves and flower head Sue Rutman @http://swbiodiversity.org, Usage Rights: CC BY-NC (Attribution-Non-Commercial) | | | | |
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Origin:
Introduced
Life Cycle:
Annual
General Desc:
Erect or spreading annual growing in dense subshrub-like clusters. Stinknet is identified by its sharp odor, its yellow flower heads resembling tiny golf balls that grow singly or in clusters at the stem tips and its very divided small dark green leaves.
Identification notes: Plants pungently scented, 6 to 18 inches tall, stems branching from the base or throughout; leaves 2 to 3 times pinnately dissected, lobes narrow; flower heads globe-like, solitary or in clusters of 2 to 4, showy, yellow, disc flowers only.
Height:
Up to about 1-1/2 feet
Habitat Description: Found in sandy and gravelly soils in washes, river bottoms, waste grounds, disturbed areas, along roadsides, major highways, vacant lots, cracks in pavement and sidewalks and agricultural field edges. It often competes with and displaces native species.
Plant Communities:
Desert Scrub, Riparian, Disturbed Areas
Elevation: 1500 - 3000 feet
Color:
Yellow
Shape:
Daisy or dandelion-like in round clusters
Tubular:
N
Flowering Period:
Feb - Jun
Description:
Globe-like flower head consists of only tube-like flowers (disc florets) each 4-lobed and 1/16 inch long. Each flower head can have as many as 250+ florets. Below the flower head is a whorl of leaf-like bracts, each bract 1/8 inch long and 1/4 inch wide.
Leaf Color:
Dark green
Leaf Type:
Simple
Leaf Shape:
Pinnatifid
Leaf Margin:
Lobed
Leaf Attachment:
Alternate
Leaves Clasp:
N
Hairs:
Leaves and stems
Spines:
N
Leaf Description:
Dark green leaves are 3/4 to 1-1/2 inches long, about 1/16 inch wide and are highly dissected into narrow segments. They are covered with very small stiff hairs or a sparse amount of very fine soft hair and dotted with tiny glands.
Fruit Color: Light brown
Fruit Type: Achene
Fruit Notes: Fruit is cylinder-shaped or 4 angled and ribbed, less than 1/16 inch long, has a slight curve and is sparsely dotted with very small glistening oil glands. Tiny hair-like bristles (pappi) form a smooth to slightly pointed narrow crown at the fruit top.
Seed Notes: Dry mature seed heads are brittle and shatter into dusty pieces loaded with thousands of tiny seeds less than 1/16 inch. Seeds germinate in about 10 days allowing stinknet to spread easily and quickly.
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