Iva axillaris

Iva axillaris, called povertyweed[2] or death weed,[3] is a North American species of flowering plants in the daisy family. It grows in the western and central United States and in western Canada, from British Columbia south to California and east as far as the western Great Plains in the Texas Panhandle, Nebraska, the Dakotas, and Manitoba.[2][4] It has also become established in Australia, where it is considered a weed.[3]

Iva axillaris
Scientific classification
Kingdom:
Plantae
(unranked):
Angiosperms
(unranked):
Eudicots
(unranked):
Asterids
Order:
Asterales
Family:
Asteraceae
Genus:
Iva
Species:
I. axillaris
Binomial name
Iva axillaris
Pursh 1813
Synonyms[1]
  • Iva axillaris var. robustior Hook.

Iva axillaris is a wind-pollinated herb up to 60 cm (2 feet) tall, spreading by means of underground rhizomes. It has many small, lance-shaped leaves rarely more than 45 mm (1.8 inches) long. Flowers are set in the axils of the leaves rather than congregated at the tips of branches as in related species. Each head can contain 9-12 florets[5][6]

References
  1. The Plant List, Iva axillaris Pursh
  2. Calflora taxon report, University of California, Iva axillaris Pursh, povertyweed
  3. Atlas of Living Australia, Iva axillaris Pursh Death Weed
  4. Biota of North America Program 2014 county distribution map
  5. Flora of North America, Iva axillaris Pursh 1813
  6. Best, K.F. 1975. Biology of Canadian weeds, 10, Iva axillaris Pursh. Canadian Journal of Plant Science 55:293-301 includes photos, distribution map, description, ecological information


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