Harmonia guggolziorum

Harmonia guggolziorum is a rare California plant species of plant in the tarweed tribe within the aster family.[1] 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.[2] 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.[3]

Harmonia guggolziorum

Critically Imperiled  (NatureServe)
Scientific classification
Kingdom:
Plantae
(unranked):
Angiosperms
(unranked):
Eudicots
(unranked):
Asterids
Order:
Asterales
Family:
Asteraceae
Tribe:
Madieae
Genus:
Harmonia
Species:
H. guggolziorum
Binomial name
Harmonia guggolziorum
B.G.Baldw.

The plant was named for Jack and Betty Guggolz, the California plant enthusiasts who collected the type specimen in 2000.[4]

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.[5][6]

The plant may be naturally rare, having evolved on its specific ultramafic soil type and never having spread beyond.[7]

References
  1. "Flann, C (ed) 2009+ Global Compositae Checklist". Archived from the original on 2015-04-18. Retrieved 2015-04-18.
  2. California Native Plant Society Rare Plant Profile
  3. Baldwin, B. G. (2001). Harmonia guggolziorum (Compositae-Madiinae), a new tarweed from ultramafics of southern Mendocino County, California. Madroño 48:293–297.
  4. CalFlora Botanical Names
  5. Jepson Manual Treatment
  6. Flora of North America
  7. The Nature Conservancy


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