Ivesia rhypara

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Ivesia rhypara
Ivesia rhypara var. rhypara in southeast Oregon 6-19-04.jpg
Status TNC G2.svg
Imperiled  (NatureServe)
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Rosales
Family: Rosaceae
Genus: Ivesia
Species:
I. rhypara
Binomial name
Ivesia rhypara

Ivesia rhypara is a species of flowering plant in the rose family known by the common name grimy mousetail, or grimy ivesia. It is native to Oregon and Nevada in the United States. [1]

This perennial herb grows from woody roots and a branching caudex. [2] It has hairy, overlapping, compound basal leaves and stems up to 15 centimeters long. At the ends of the stems are clustered white or pale-yellow flowers. Blooming occurs in May through October. [1] [3]

There are two varieties of this plant. The var. rhypara grows on barren tuff and var. shellyi grows in rock cracks and crevices on pumice and tuff. [1] When the plants grow in rock fissures they sometimes appear to be lined up in rows. [4] Associated plants include Purshia tridentata , Poa sandbergii , [1] Gilia congesta , Sitanion hystrix , Scutellaria nana , and Eriophyllum lanatum . [3]

Threats to this species, particularly var. rhypara, include gold mining, as the habitat contains gold deposits. Other threats include cattle, off-road vehicles, fire suppression, and loss of pollinating insects. [4]

The plant gets the name rhypara ("grimy" in Greek) both from its dusty appearance and from its discoverer, James W. Grimes. [3] [4]

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References

  1. 1 2 3 4 Ivesia rhypara. The Nature Conservancy.
  2. Ivesia rhypara. Archived 2010-05-27 at the Wayback Machine Nevada Natural Heritage Program.
  3. 1 2 3 Ivesia rhypara. Oregon Department of Agriculture.
  4. 1 2 3 Ivesia rhypara var. rhypara. Archived 2011-10-26 at the Wayback Machine Center for Plant Conservation.