Plant Data

Names and Taxonomy

  • Common Names: Conyza, Coulter's Horseweed, Coulter's Woolwort, Annual Horsetail
  • Synonyms: Conyza coulteri, Conyza coulteri var. virgata, Eschenbachia coulteri
  • Family: Asteraceae (Sunflower)
  • Genus Information: 6 species in NV, 6 in CA, 6 in US

Habit and Size

  • Duration: annual/weed
  • Habit: herb/forb
  • Shape: upright, columnar
  • Size: 5 ft (1.5 m)
  • Stem: green, hairy

Leaves

  • Color: green
  • Shape: lanceolate, linear
  • Edge: serrated
  • Arrangement: alternate whorls
  • Leaf Retention: deciduous

Flowers and Fruit

  • Sex: monoecious
  • Flower Color: white, pink
  • Flower Size: 1 inch (2 cm)
  • Number of Petals: many
  • Bloom: all year, mostly in fall
  • Fruit: cypsela/achene

Habitat and Growing Conditions

  • Water Use: low
  • Light: full sun
  • Soil: dry
  • Habitat: riparian

Distribution

  • Distribution: AZ, CA, CO, NM, NV, TX, UT
  • Seen: Henderson Bird Viewing Preserve
  • Elevation: 9000 feet (1800)

Photographs

Coulter's Horsetail (Laennecia coulteri)

Henderson Bird Viewing Preserve (10/25)

Coulter's Horsetail (Laennecia coulteri)

Henderson Bird Viewing Preserve (10/25)

Coulter's Horsetail (Laennecia coulteri)

Henderson Bird Viewing Preserve (10/25)

Coulter's Horsetail (Laennecia coulteri)

Henderson Bird Viewing Preserve (10/25)