Distribution and Habitat
The Eriophyllum latilobum range covers only portions of San Mateo County and Napa County in habitats of oak woodland, but at altitudes only between 100 to 150 meters. Eriophyllum latilobum grows to 90 centimeters in height on erect woolly stems and produces bright yellow flowers. Latilobum means "with wide lobe," from Latin latus, "wide".
Eriophyllum latilobum occurs primarily in shaded moist positions on steep grassy or sparsely wooded slopes of serpentine soil. The remaining colonies of San Mateo County consist of several hundred plants scattered along a two and one half mile length of Crystal Springs Road. These are most likely the relict fragments of a historically continuous population.
San Mateo woolly sunflower is associated with serpentine soils, which are found in discontinuous outcrops in the Coast Ranges of the San Francisco Bay Area (and other locations not involving E. latilobum). The chief constituent of the parent rock is a variant of iron-magnesium silicate. Many species associated with serpentine soils have status ranging from vulnerable to endangered.
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