Ambrosia ilicifolia

Ambrosia ilicifolia is a species of ragweed known by the common names hollyleaf burr ragweed and hollyleaf bursage.[2]

Ambrosia ilicifolia
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Asterales
Family: Asteraceae
Genus: Ambrosia
Species:
A. ilicifolia
Binomial name
Ambrosia ilicifolia
(A.Gray) W.W.Payne
Synonyms[1]
  • Franseria ilicifolia A.Gray
  • Gaertneria ilicifolia (A.Gray) Kuntze

It is native to the deserts and mountains of western Arizona, and the adjacent Sonoran Desert areas of southeastern California, Sonora and Baja California. It grows in dry washes, scrub, and other local habitats.[3][4]

Description

Ambrosia ilicifolia is a small, matted shrub under 1 metre (3.3 ft) in height. Its stiff, straight branches are green, glandular, and leafy when young, and light gray and leafless when older. The holly-like leaves are leathery but brittle, oval-shaped to rounded, and edged with spine-tipped teeth. They are green, veiny and sticky with resin.[3][5]

The inflorescence holds several spiny staminate (male) flower heads next to larger pistillate (female) heads. Each pistillate head produces usually two fruits, which are yellow-brown burrs nearly 2 centimeters wide. Each burr is rounded, sticky, and covered in hooked spines.[6]

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References
  1. The Plant List Ambrosia ilicifolia (A.Gray) W.W.Payne
  2. Calflora taxon report, University of California, Ambrosia ilicifolia (A. Gray) Payne holly leaved burbush, hollyleaf bursage
  3. Flora of North America Vol. 21 Page 12 Ambrosia ilicifolia (A. Gray) W. W. Payne
  4. Biota of North America Program 2014 county distribution map
  5. Payne, Willard William 1964. Journal of the Arnold Arboretum 45(4): 425
  6. Jepson Manual Treatment — Ambrosia ilicifolia


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