Protection and Current Status
Santa Cruz tarweed had been considered almost extinct by the year 1960. Subsequently it was listed as a California protected species. Colonies are found in the city of Santa Cruz (Arana Gulch, Twin Lakes, and Graham Hill Road areas); in the city of Watsonville (Harkins Slough, Spring Hills Gold Course and Watsonville Airport environs); and on the Porter Ranch in Monterey County. It has also been found in the Elkhorn Slough area. In the 1980s other colonies were found including locations as far north as western Contra Costa County immediately east of I-80 by Earth Metrics Inc. In a successful experiment, Santa Cruz tarweed was shown to thrive when non-native grasses were removed in the Arana Gulch.
Read more about this topic: Holocarpha Macradenia
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