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Arnica lanceolata ssp. prima
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Streambank Arnica
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Arnica lanceolata ssp. prima

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About Streambank Arnica (Arnica lanceolata ssp. prima) Arnica amplexicaulis is a species of arnica known by the common name clasping arnica. It is native to western North America from Alaska to California to Wyoming, where it grows in moist areas such as mountain meadows and streambanks. This is a perennial herb usually growing from a small rhizome and producing one or more hairy, hairy stems. The stems are lined with 5 to 10 pairs of oval-shaped, toothed leaves up to 12 centimeters long. The flower cluster is a cluster of several daisylike flower heads with a center of brownish disc florets and a fringe of yellow ray florets 1 to 2 centimeters long. The fruit is a cylindrical achene covered in hairs and with a light brown pappus at one end.
Plant Description
Plant Type
Perennial herb

Max. Height
2.6 ft (0.8 m)

Flower Color

Native Status

Natural Setting
Site Type
Moist open places and streambanks

Sun, Part Shade

Elevation ?
340' - 11399'

Annual Precip. ?
10.6" - 128.0"

Summer Precip. ?
0.28" - 4.44"

Coldest Month ?
19.6° F - 51.1° F

Hottest Month ?
41.1° F - 77.8° F

Humidity ?
1.23 vpd - 25.21 vpd

Landscaping Information
Nursery Availability
Never or Almost Never Available

Other Names
Common Names
Clasping Arnica

Sources include: Wikipedia. All text shown in the "About" section of these pages is available under the Creative Commons Attribution-ShareAlike License. Plant observation data provided by the participants of the California Consortia of Herbaria, Sunset information provided by Jepson Flora Project. Propogation from seed information provided by the Santa Barbara Botanical Garden from "Seed Propagation of Native California Plants" by Dara E. Emery. Sources of plant photos include CalPhotos, Wikimedia Commons, and independent plant photographers who have agreed to share their images with Calscape. Other general sources of information include Calflora, CNPS Manual of Vegetation Online, Jepson Flora Project, Las Pilitas, Theodore Payne, Tree of Life, The Xerces Society, and information provided by CNPS volunteer editors, with special thanks to Don Rideout. Climate data used in creation of plant range maps is from PRISM Climate Group, Oregon State University, using 30 year (1981-2010) annual "normals" at an 800 meter spatial resolution.

Links:   Jepson eFlora Taxon Page  CalPhotos  Wikipedia  Calflora

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