Plant Image
Flowers


Yavapai County Native & Naturalized Plants

Laennecia coulteri - Coulter's horseweed

Synonyms: Conyza coulteri, C. coulteri var. virgata, Eschenbachia coulteri
Other Common Names: Coulter's Woolwort, annual horsetail, conyza
Plant Form: Forb or Subshrub

Family: Asteraceae


   
 
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Flowers and fruit
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)
Leaves
Max Licher @http://swbiodiversity.org, Usage Rights: Creative Commons Attribution-ShareAlike (CC BY-SA)
Forb Plant Description

Origin: Native   Life Cycle: Annual
General Desc: Herb with taproot; stems glandular or covered with sticky hairs which resemble spider's web (arachnoid).
Identification notes: Stems and leaves glandular or viscid; leaves more or less serrated or divided into deep narrow irregular segments. Flower heads without ray flowers, the disc flower are about half as long as the tuft of hairs on each seed.
Height: 4 to 40 inches


Habitat

Habitat Description: Found in ditch banks, dry stream beds and disturbed sites.
Plant Communities: Desert Scrub, Interior Chaparral, Semidesert Grasslands, Pinyon Juniper Woodland, Montane Conifer Forest, Riparian, Disturbed Areas
Elevation: 1500 - 9000 feet


Flower Characteristics

Color: Whitish     Shape: Daisy or dandelion-like in elongated clusters     Tubular: N     Flowering Period: Sep - Oct
Description: Disc flowers only along elongated, branched stems, 5 to 20 per flower stem; 2 to 5 bracts (phyllaries) cone-shaped, 1/8 inch diameter; 60 to 100 female whitish flowers ring the edges of flower heads.


Leaf and Stem Characteristics

Leaf Color: Green     Leaf Type: Simple     Leaf Shape: Narrow     Leaf Margin: Toothed     Leaf Attachment: Basal and alternate     Leaves Clasp: Y
Hairs: Leaves and stems     Spines: N
Leaf Description: When plant is young, leaves form a densely hairy basal rosette; after plant bolts, leaves alternate along the stem, mostly sessile and clasping; blades oblong, 3/4 to 2 inches long and 1/4 to 3/4 inch wide, many irregularly toothed or obscurely lobed.


Fruit and Seed Characteristics

Fruit Color: Whitish   
Fruit Type: Achene
Fruit Notes: Achenes <1/16 inch long, pale tan, topped with a pappus of 10 to 30 fragile and easily deciduous whitish bristles.


  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  
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