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Hayfield Tarweed
Hemizonia congesta
  
About Hayfield Tarweed (Hemizonia congesta) 3 Nurseries Carry This Plant Hemizonia congesta is a species of flowering plant in the daisy family known by the common name hayfield tarweed. It is native to California and Oregon, where it is a common member of the flora in a number of habitats, particularly grasslands and fields. This is a spindly, thin-stemmed annual herb growing erect to 10 to 80 centimeters in height. Like other tarweeds the stem and foliage are hairy and have an odor reminiscent of tar. Most of the long, narrow, pointed leaves are located on the lower portion of the stem below the branching. The flower clusters are covered in hairy hairs and hold daisylike flower heads. Each head has a center of yellowish dark-tipped disc florets and a fringe of bright yellow to white ray florets, often with purplish striping on the undersides. The ray florets are toothed or lobed on the tips, with the middle tooth thinner than the others. There are many subspecies which can vary in appearance.
Plant Description
Plant Type
Plant Type
Annual herb

Size
Size
0.33 - 2.6 ft tall

Flower Color
Flower Color
Yellow

Flowering Season
Flowering Season
Winter, Spring, Summer, Fall

Wildlife Supported
 


 
Butterflies & moths hosted ( 2 likely * ) SHOW ALL

Landscaping Information
Sun
Sun
Full Sun

Moisture
Moisture
Low

Nurseries
Nurseries

Common uses
Common uses
Bee Gardens

Natural Setting
Site Type
Site Type
Open, grassy places

Climate
Climate
Annual Precipitation: 14.0" - 101.1", Summer Precipitation: 0.14" - 2.98", Coldest Month: 29.8" - 52.6", Hottest Month: 53.4" - 76.6", Humidity: 0.03" - 25.04", Elevation: -132" - 6722"


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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