Species Detail Forb

Flower head Grapevine Canyon - Sue Smith		Yavapai County Native & Naturalized Plants Bidens pilosa - hairy beggarticks Synonyms: Bidens odorata Other Common Names: Spanish needle, shepherds needles Plant Form: Forb or Subshrub Family: Asteraceae
Flower head Grapevine Canyon - Sue Smith


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Leaf Grapevine Canyon Sue Smith	Plant - summer Grapevine Canyon Sue Smith

Forb Plant Description

Origin: Introduced Life Cycle: Annual Similar Species: Bidens sp.
General Desc: Erect and much branched annual with 4-sided stems. Flowers mostly borne singly on long erect stems. A weed of many crops and orchards. Plants are erect when young, but bow under their own weight with age.
Identification notes: Annual plants with pinnately lobed leaves of 3 to 7 primary lobes; single flower heads or sometimes several; involucres (whorl of flower bracts) bell-shaped to top-shaped or hemispheric or broader, 1/4 to 1/2 inch diameter, disc florets 20 to 80+.
Height: To 3 feet

Habitat

Habitat Description: Usually occurs in wetlands, but occasionally found in non-wetlands including roadsides and ditch banks.
Plant Communities: Riparian, Disturbed Areas
Elevation: 3500 - 6000 feet

Flower Characteristics

Color: White, yellow Shape: Daisy or dandelion-like not in clusters Tubular: N Flowering Period: May - Oct
Description: 5 to 8 white ray flowers and many yellow disc flowers, terminal flower heads number one to several.

Leaf and Stem Characteristics

Leaf Color: Green Leaf Type: Compound Leaf Shape: Pinnatifid Leaf Margin: Toothed Leaf Attachment: Opposite Leaves Clasp: N
Hairs: Leaves and stems Spines: N
Leaf Description: Pinnate with 3 to 7 leaflets; leaflet margins are serrate.

Fruit and Seed Characteristics

Fruit Color: Reddish-brown
Fruit Type: Achene
Fruit Notes: Fruits narrowly cylindric or slightly compressed, 4-angled, 1/2 inch long with awns at tip.


	Arizona Cooperative Extension Yavapai County 840 Rodeo Dr #C Prescott, AZ 86305 (928) 445-6590	Version 8.0 http://cales.arizona.edu/yavapaiplants/SpeciesDetailForb.php Last Updated: Dec 13, 2022 Content Questions/Comments: Email Matt Halldorson Legal Disclaimer