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 Leaves Max Licher @http://swbiodiversity.org, Usage Rights: Creative Commons Attribution-ShareAlike (CC BY-SA) |  Plant Max Licher @http://swbiodiversity.org, Usage Rights: Creative Commons Attribution-ShareAlike (CC BY-SA) |  Phyllaries Sue Carnahan @http://swbiodiversity.org, Usage Rights: CC BY-NC (Attribution-Non-Commercial) | | | |
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Origin:
Native
Life Cycle:
Annual Similar Species: Bidens heterosperma
General Desc:
Slender annuals to 24 inches tall; stems erect, branching above; flower heads small with yellow ray and disc flowers; ray flowers fertile, disc flowers often infertile; outer bracts narrow and green while inner bracts wider, oval with dark parallel lines.
Identification notes: Slender annuals; leaves opposite, 2 bract types differentiate, few narrow outer green bracts, inner are oval shaped, light-colored, dark nerved; ray achenes are oval-shaped, disc achenes narrow, highly divided, 2-barbed like Bidens
Height:
6 to 24 inches
Habitat Description: Found on open rocky slopes, often on volcanic and calcium rich soils.
Plant Communities:
Interior Chaparral, Pinyon Juniper Woodland, Montane Conifer Forest
Elevation: 4000 - 7000 feet
Color:
Yellow
Shape:
Daisy or dandelion-like not in clusters
Tubular:
N
Flowering Period:
Aug - Sep
Description:
Flower heads small, borne singly or loose array; yellow; ray florets 1 to 3 per flower head, disc florets 3 to 10 per head; bracts in 2 distinct series, outer bracts 3 to 5 per head, narrow and green, inner bracts wider with 10 to 15 dark-colored nerves.
Leaf Color:
Green
Leaf Type:
Simple
Leaf Shape:
Pinnatifid
Leaf Margin:
Smooth
Leaf Attachment:
Opposite
Leaves Clasp:
N
Hairs:
No
Spines:
N
Leaf Description:
Opposite, at least below the flowers; blades 3/4 to 2 inches long; once or twice pinnately lobed, the lobes linear to thread-like, or rarely lance-like, grooved; upper and lower surface smooth; usually hairless but can be densely hairy.
Fruit Type: Achene
Fruit Notes: Achenes from ray and disc florets have different forms; ray achenes (outer) are oval-shaped and winged, 1/8 to 1/4 inch long and reddish-brown; disc achenes (inner) are narrower and topped with a pair of awns (barbed), up to 1/2 inch long.
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