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Spearleaf Agoseris Back to Plant Page
Agoseris retrorsa

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About Spearleaf Agoseris (Agoseris retrorsa) Agoseris retrorsa is a species of flowering plant in the daisy family known by the common name spearleaf agoseris. It is native to western North America from Washington to Utah to Baja California, where it grows in many types of habitat, including chaparral, scrub, and coniferous forest. It is a perennial herb forming a base of leaves about a number of erect, thick, wool-coated flower clusters up to half a meter in height. The narrow leaves are linear to lance-shaped, and spearlike with curving toothlike lobes along the edges. The flower cluster bears a single flower head which is several centimeters wide when fully open. It is lined with woolly, pointed phyllaries which are green, often with reddish purple longitudinal streaks or stripes. The flower head contains many golden yellow ray florets, the outer ones usually darker in color. The fruit is an achene with a plumelike pappus of white bristles.
Plant Description
Plant Type
Perennial herb

Max. Height
1.6 ft (0.49 m)

Flower Color

Native Status

Natural Setting
Site Type
Dry places

Sun, Part Shade

Elevation ?
144' - 11596'

Annual Precip. ?
3.1" - 122.2"

Summer Precip. ?
0.15" - 3.67"

Coldest Month ?
21.6° F - 59.4° F

Hottest Month ?
42.8° F - 88.1° F

Humidity ?
0.20 vpd - 38.62 vpd

Landscaping Information
Nursery Availability
Rarely Available

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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