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 Edit this 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]

Galls

This species is host to the following insect induced gall: Aceria franseriae bead leaf gall Mite external link to gallformers external link to inaturalist images

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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