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Coast Tarweed
Madia sativa
About Coast Tarweed (Madia sativa) 0 Nurseries Carry This Plant Madia sativa is a species of flowering plant in the aster family known by the common names coast tarweed and Chilean tarweed. It is native to the Americas, where it is distributed in two main areas: the west coast of North America from Alaska and British Columbia to Baja California, and Chile and Argentina. It grows in many types of habitat, including disturbed areas. In North America it is most common on coastal grassland and nearby areas. This is an annual herb varying in size from 20 centimeters tall to well over two meters, the leafy stem branching or not. It is coated densely in sticky resin glands and it has a strong unpleasant scent. The hairy leaves are linear or lance-shaped, the lowest up to 18 centimeters long. The flower cluster is generally a cluster of flower heads lined with bristly, hairy phyllaries. Each head bears approximately 8 yellowish ray florets a few millimeters long around a center of several disc florets tipped with dark anthers. The fruit is a flat, hairless achene with no pappus. This plant has been grown for its seed oil.
Plant Description
Plant Type
Plant Type
Annual herb

0.7 - 8 ft tall

Flower Color
Flower Color

Wildlife Supported

Butterflies & moths hosted ( 3 likely * ) SHOW ALL

Landscaping Information
Full Sun

Common uses
Common uses
Bee Gardens

Natural Setting
Site Type
Site Type
grassy places

Annual Precipitation: 9.2" - 86.0", Summer Precipitation: 0.15" - 3.85", Coldest Month: 10.8" - 55.8", Hottest Month: 34.1" - 78.5", Humidity: 0.01" - 25.40", Elevation: -7" - 14090"

Alternative Names
Common Names: Chilean Tarweed

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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