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Threadleaf Ragwort
Senecio flaccidus
About Threadleaf Ragwort (Senecio flaccidus) Nurseries Show All Photos Senecio flaccidus, formerly recorded as Senecio douglasii (in honor of the botanist David Douglas) member of the daisy family and genus Senecio also known as Threadleaf Groundsel (and Bush Senecio, Creek Senecio, Shrubby Butterweed, Comb Butterweed, Smooth Threadleaf Ragwort, Mono Ragwort, Douglas Ragwort, Douglas Groundsel, Sand Wash Groundsel, Felty Groundsel, Old Man, Yerba Cana, Squawweed or Cenicillo) is a native of the southwestern Great Plains of North America. Threadleaf ragwort is a fast growing, short lived (3 to 6 years) bushy perennial shrub growing to 4 feet 6 inches ; common in gravelly washes, dry creek beds, along roads & trails and mostly away from the coast.
Plant Description
Plant Type

Max. Height
5 ft (1.5 m)

Growth Rate

Flower Color

Flowering Season
Summer, Fall

Native Status

Natural Setting
Site Type
Dry, rocky or sandy places


Elevation ?
3' - 10012'

Annual Precip. ?
3.2" - 51.2"

Summer Precip. ?
0.14" - 4.37"

Coldest Month ?
28.8° F - 56.6° F

Hottest Month ?
55.4° F - 85.8° F

Humidity ?
0.68 vpd - 40.38 vpd


Landscaping Information
Water Requirement ?
Extremely Low, Very Low
Extremely Low
Very Low
Moderate - High

Nursery Availability
Sometimes Available

Other Names
Common Names
Bush Senecio, Creek Senecio, Douglas Senecio, Threadleaf Groundsel

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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