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Equisetum similkamense is an extinct horsetail known only from fossil rhizomes, stems and leaves found in Eocene rocks in British Columbia, Canada. It belongs to the living genus Equisetum, but it is not a plant you can grow, so the care fields below describe horsetails in general rather than this fossil species.
Equisetum similkamense is an extinct horsetail species in the family Equisetaceae described from a group of whole plant fossils including rhizomes, stems, and leaves. The species is known from Ypresian sediments exposed in British Columbia, Canada. It is one of several extinct species placed in the living genus Equisetum.
Equisetum similkamense is known from a series of specimens which were recovered from a single formation in the Eocene Okanagan Highlands, outcrops of the Ypresian Allenby Formation around Princeton, British Columbia. In addition to the type locality on Nine Mile Creek, an additional find of E. similkamense was reported by Melcon (1975) from outcrops of brecciated shale near Glacier Lake in Cathedral Provincial Park. The Allenby Formation preserves an upland lake system surrounded by a mixed conifer–broadleaf forest with nearby volcanism. The highlands likely had a mesic upper microthermal to lower mesothermal climate, in which winter temperatures rarely dropped low enough for snow, and which were seasonably equitable. The Okanagan Highlands paleoforest surrounding the lakes have been described as precursors to the modern temperate broadleaf and mixed forests of Eastern North America and Eastern Asia.
Field Horsetail · Andean Horsetail · Braun's Horsetail · Equisetum diffusum · Water horsetail · Southern Giant Horsetail · Rough Horsetail · Smooth horsetail · Equisetum ×moorei · Mexican Giant Horsetail · Marsh horsetail · Scouringrush Horsetail
Text excerpted from the Wikipedia article Equisetum similkamense by its contributors, under CC BY-SA 4.0; the excerpts and the care summary drawn from them are shared under the same licence.
The care summary was written by AI (Claude, Anthropic) from the sources on this page, with general growing knowledge where they are silent. Check before relying on it.
