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Ambrosia confertiflora is a North American species of ragweed known by the common name weakleaf bur ragweed.[2]

Ambrosia confertiflora
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Asterales
Family: Asteraceae
Genus: Ambrosia
Species:
A. confertiflora
Binomial name
Ambrosia confertiflora
DC.
Synonyms[1]
Synonymy
  • Ambrosia caudata (Rydb.) Shinners
  • Ambrosia fruticosa DC. 1836 not Medik. 1775
  • Ambrosia simulans Shinners
  • Franseria caudata Rydb.
  • Franseria confertiflora (DC.) Rydb.
  • Franseria hispidissima Rydb.
  • Franseria incana Rydb.
  • Franseria pringlei Rydb.
  • Franseria strigulosa Rydb.
  • Franseria tenuifolia Harv. & A.Gray
  • Gaertneria tenuifolia (Harv. & A.Gray) Kuntze
  • Gaertneria tenuifolia Harv. & A.Gray
  • Xanthidium tenuifolium (Harv. & A.Gray) Delpino

Description


Ambrosia confertiflorais a perennial herb reaching heights between 30 centimeters and nearly two meters with bristly, fuzzy green to brown erect stems. The multilobed fuzzy leaves have blades which can be nearly 16 centimeters long and are borne on petioles with lobed, winglike appendages. As in other ragweeds, the inflorescence has staminate (male) and pistillate (female) flower heads. The pistillate heads yield one or two fruits which are burrs up to half a centimeter long and covered in short spines.[3][4]


Distribution and habitat


Ambrosia confertiflora is native to much of northern Mexico (from Sonora to Tamaulipas) and the southwestern United States from California east as far as Kansas, Oklahoma, and central Texas.[5] It is also naturalized in various other regions, and has been declared a noxious weed in Australia[6][7][8] and in Israel.[9] It grows in disturbed sites.[4]


References


  1. The Plant List Ambrosia confertiflora DC.
  2. Calflora taxon report, University of California, Ambrosia confertiflora DC. weak leaved burweed, weakleaf burr ragweed
  3. Jepson Manual Treatment
  4. Flora of North America Vol. 21 Page 18 Ambrosia confertiflora de Candolle in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 5: 526. 1836.
  5. Biota of North America Program 2014 county distribution map
  6. State of Victoria, Victorian Resources Online, Map of Potential Distribution of Burr ragweed (Ambrosia confertiflora) in Victoria
  7. Atlas of Living Australia, Ambrosia confertiflora DC. Burr Ragweed
  8. Southern Tablelands and South Coast Noxious Plants Committee (New South Wales), burr ragweed
  9. Dufour-Dror, Jean-Marc; Yaakobi, Tuvia (1 May 2013). "Ambrosia confertiflora – Burr Ragweed – Information booklet" (PDF). Israeli Ministry of Environmental Protection. Retrieved 1 October 2018.



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