Ambrosia chenopodiifolia

Ambrosia chenopodiifolia is a species of ragweed known by the common names San Diego bursage and San Diego bur ragweed.[2] It is native to the Mexican states of Baja California and Baja California Sur (Comondu Municipality),[3] as well as to Orange[4] and San Diego Counties it int US State of California.[5] It is a member of the coastal sage scrub plant community.

Ambrosia chenopodiifolia

Vulnerable  (NatureServe)
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Asterales
Family: Asteraceae
Genus: Ambrosia
Species:
A. chenopodiifolia
Binomial name
Ambrosia chenopodiifolia
Synonyms[1]
  • Franseria chenopodiifolia Benth.
  • Franseria lancifolia Rydb.
  • Gaertneria chenopodiifolia (Benth.) Abrams

Description

Ambrosia chenopodiifolia is a thickly branching shrub exceeding 3 meters in maximum height. The leaves are ovals up to 3 centimeters long and coated in white hairs. They are sometimes lobed.[5]

Like other ragweeds it is monoecious, with each inflorescence bearing heads of pistillate (female) flowers below a cluster of staminate (male) flowers. The inflorescence is spiny, especially when in fruit. The fruit is a spherical, woolly bur about half a centimeter long covered in hooked spines.[5]

References
  1. The Plant List Ambrosia chenopodiifolia (Benth.) W.W.Payne
  2. Ambrosia chenopodiifolia. NatureServe. 2012.
  3. Payne, Willard William 1964. Journal of the Arnold Arboretum 45(4): 419
  4. Calflora taxon report, University of California @ Berkeley, Ambrosia chenopodiifolia (Benth.) Payne San Diego bur sage, San Diego bursage
  5. Flora of North America Vol. 21 Page 14 Ambrosia chenopodiifolia (Bentham) W. W. Payne, J. Arnold Arbor. 45: 419. 1964


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