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 Max Licher @http://swbiodiversity.org, Usage Rights: Creative Commons Attribution-ShareAlike (CC BY-SA) |  Max Licher @http://swbiodiversity.org, Usage Rights: Creative Commons Attribution-ShareAlike (CC BY-SA) | | | | |
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Origin:
Native
Life Cycle:
Annual Similar Species: Ambrosia acanthicarpa, A. psilostachya, A. confertiflora
General Desc:
Stems upright, hairy, rough; leaves highly dissected, opposite attachment below, alternate above.
Identification notes: Annual; erect stems; leaves thin, fern-like, deeply lobed with many side lobes, lower leaves deeply lobed again (bipinnatifid) and attached opposite, upper leaves alternate attachment; flower heads along the length of slender, elongated spikes.
Height:
8 to 40 inches
Habitat Description: Found on roadsides, in old fields and other waste places.
Plant Communities:
Disturbed Areas
Elevation: 5200 - 8000 feet
Color:
Green, yellowish-green, brown
Shape:
Inconspicuous not in clusters
Tubular:
N
Flowering Period:
Aug - Sep
Description:
Heads disc flowers; terminal spike-like male flower clusters 1 to 4 inches long, may have 2 short side spikes; female flowers sessile, single, 1/8 inch long, green, turning yellow-green and brown as it matures; female and male flowers in separate heads.
Leaf Color:
Green
Leaf Type:
Compound
Leaf Shape:
Pinnatifid
Leaf Margin:
Toothed
Leaf Attachment:
Alternate and opposite
Leaves Clasp:
N
Hairs:
Leaves and stems
Spines:
N
Leaf Description:
Pinkish-red stems grooved and hairy; green leaves to 6 inches long, 4 inches wide, lower leaves opposite, upper alternate along the stem, deeply lobed, base much wider than the tip; margins smooth or toothed.
Fruit Color: Brown
Fruit Type: Achene
Fruit Notes: Woody with 4 to 7 spine-like projections, resembling a crown.
Seed Notes: Numerous seeds per flower head, viable for up to 5 years.
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