Horkelia tridentata Torr. var. illiterata Ertter & Reveal is proposed for aberrant populations clustered in the southeast margin of the species' range in the High North Coast Ranges in California. The variety has most of the diagnostic characters of var. flavescens (Rydb.) Ertter & Reveal, which is otherwise the only variety in the North Coast Ranges, but lacks the hairs on the interior wall of the hypanthium that provide the most reliable distinction between var. flavescens and var. tridentata; the epithet indicates a classic example of plants that “haven't read the book.” This is the only variety of H. tridentata that occurs in and near the Berryessa Snow Mountain National Monument. The relatively few populations indicate that some level of conservation status is warranted.
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28 May 2024
A NEW VARIETY OF HORKELIA TRIDENTATA (ROSACEAE: POTENTILLEAE) FROM THE HIGH NORTH COAST RANGES OF CALIFORNIA, USA
Barbara Ertter
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Madroño
Vol. 70 • No. 4
October–December 2023
Vol. 70 • No. 4
October–December 2023
Berryessa Snow Mountain National Monument
High North Coast Ranges
Horkelia tridentata
new California taxa
Potentilla tilingii
rare plants