Acamptopappus sphaerocephalus

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Acamptopappus sphaerocephalus
Acamptopappus sphaerocephalus 7.jpg
Status TNC G5.svg
Secure  (NatureServe) [1]
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Asterales
Family: Asteraceae
Genus: Acamptopappus
Species:
A. sphaerocephalus
Binomial name
Acamptopappus sphaerocephalus
(Harv. & A.Gray ex A.Gray) A.Gray
Synonyms [2] [3]
  • Acamptopappus microcephalusM.E.Jones
  • Haplopappus sphaerocephalusHarv. & A.Gray
  • Aplopappus sphaerocephalusHarv. & A.Gray

Acamptopappus sphaerocephalus is a species of flowering plant in the family Asteraceae known by the common name rayless goldenhead. It is native to the southwestern United States, where it occurs in southern California, southern Nevada, southern Utah, and Arizona. [4]

This shrub or subshrub produces an upright, branching stem with shreddy whitish or gray bark. It approaches one meter in maximum height but generally grows to 20 to 40 centimeters. The gray-green leaves are linear or lance-shaped and are arranged alternately, sometimes growing in small clusters. They are hairless or have small, rough hairs. The inflorescence is a solitary flower head or a small cluster of heads. The head is hemispherical or spherical in shape. It has yellow disc florets and no ray florets. The fruit is an achene tipped with thick scales and bristles. [5] [3] [6]

This plant grows in the deserts of the southwestern United States, especially the Mojave Desert. It is also present in the southern Great Basin and the northern Sonoran Desert. It grows in desert washes and on plains, mesas, and ridges. It is a member of several plant communities in pinyon-juniper woodlands, mesquite, creosote, and grassy shrubsteppe. It may be associated with catclaw acacia (Acacia greggii), California juniper (Juniperus californica), scrub oak (Quercus turbinella), Joshua tree (Yucca brevifolia), California buckwheat (Eriogonum fasciculatum), golden cholla (Opuntia echinocarpa), and Mojave yucca (Y. schidigera). [6]

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References

  1. NatureServe (6 December 2024). "Acamptopappus sphaerocephalus| NatureServe Explorer". NatureServe Explorer. Arlington, Virginia. Retrieved 22 December 2024.
  2. The Plant List, Acamptopappus sphaerocephalus (Harv. & A.Gray) A.Gray
  3. 1 2 Acamptopappus sphaerocephalus. Flora of North America.
  4. Biota of North America Program 2014 county distribution map
  5. Acamptopappus sphaerocephalus. Jepson Manual Treatment.
  6. 1 2 Griffith, Randy Scott. 1991. Acamptopappus sphaerocephalus. In: Fire Effects Information System, [Online]. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory.