Harmonia guggolziorum is a rare California plant species of plant in the tribe Madieae within the family Asteraceae. It is known by the common names Guggolz tarplant and Guggolzes' harmonia. It is endemic to Mendocino County, California, where it is known from two occurrences near Hopland.California Native Plant Society Rare Plant Profile It is a member of the serpentine soils flora and grows in chaparral habitat. It was only discovered in 2000 and described to science in 2001.Baldwin, B. G. (2001). Harmonia guggolziorum (Compositae-Madiinae), a new tarweed from ultramafics of southern Mendocino County, California. Madroño 48:293–297.
The plant was named for Jack and Betty Guggolz, the California plant enthusiasts who collected the type specimen in 2000.CalFlora Botanical Names
This rare plant is an annual herb producing an erect stem up to 30 centimeters tall, branching in the upper part. The leaves are mostly located around the central part of the stem and near the bases of the upper branches. The leaves are linear and coated in rough hairs and large resin glands. The inflorescence is a single flower head or a loose cluster of heads each with 3 to 6 yellow ray florets measuring about half a centimeter long.Jepson Manual TreatmentFlora of North America
The plant may be naturally rare, having evolved on its specific ultramafic soil type and never having spread beyond.The Nature Conservancy
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