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Northern Island Haplopappus
Hazardia detonsa
  
About Northern Island Haplopappus (Hazardia detonsa) 2 Nurseries Carry This Plant Hazardia detonsa is a rare species of shrub in the daisy family known by the common name island bristleweed. It is endemic to three of the eight Channel Islands of California. This is a bushy shrub reaching 60 centimeters to 2.5 meters in height. It has densely woolly, hairy herbage of thick, serrated, oval-shaped leaves up to 14 centimeters long. At the ends of its whitish stems it produces bell-shaped flower heads each about a centimeter long. Each flower head has several rows of white woolly phyllaries and an open end revealing disc florets and longer protruding ray florets. The florets are yellow and may age to red or purple. The main threat to this species on Santa Cruz Island was the presence of feral Santa Cruz sheep. The sheep were removed, allowing the plant to begin its recovery there.
Plant Description
Plant Type
Plant Type
Shrub

Size
Size
2 - 8 ft tall

Flower Color
Flower Color
Yellow, White

Flowering Season
Flowering Season
Spring, Summer, Fall

Wildlife Supported
 


 
Butterflies & moths hosted ( 1 likely * ) SHOW ALL

Landscaping Information
Sun
Sun
Full Sun

Moisture
Moisture
Very Low

Nurseries
Nurseries

Soil Drainage
Soil Drainage
Fast

Sunset Zones
Sunset Zones?
5, 9, 14*, 15*, 16*, 17*, 19, 20, 21, 22*, 23*, 24*

Natural Setting
Site Type
Site Type
Open rocky slopes, canyon walls

Climate
Climate
Annual Precipitation: 10.9" - 19.1", Summer Precipitation: 0.14" - 0.40", Coldest Month: 46.1" - 55.6", Hottest Month: 62.7" - 77.6", Humidity: 1.36" - 23.49", Elevation: 1" - 1673"

Alternative Names
Common Names: Island Bristleweed


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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