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Equisetum ×mackaii
Scientific Name: Equisetum ×mackaii
Family: Equisetaceae
Category: Horsetail
Growth: Forb/herb
Duration: Perennial
Other Names:
Equisetum mackaii
Equisetum mackaii, a hybrid horsetail, presents a fascinating study in plant taxonomy and distribution.
Common Names
- MacKay's horsetail
- Mackai's horsetail
- Jesup's horsetail
- MacKay's scing-rush
- Rough-toothed scing-rush
Taxonomy and Nomenclature
- Scientific Name: Equisetum mackaii (Newman) Brichan
- Family: Equisetaceae
- Kingdom: Plantae
- Synonyms:
- Equisetum hyemale var. mackaii Newman
- Equisetum hyemale subsp. trachyodon
- Equisetum trachyodon (A.Braun) W.D.J.Koch
- Equisetum variegatum Schleich. ex F. Weber & D.M.H.
- Hybrid of: Equisetum hyemale and Equisetum variegatum
- Taxonomic Status: Accepted
Distribution and Habitat
- Found in wet ditches and riverbanks.
- Observed in locations including Northern Ireland (Belfast, Colin Glen).
- Also reported from Antarctica.
- Prefers wet places.
Morphological Characteristics
- Aerial stems persist more than a year.
- Stems are typically unbranched and range from 20-86 cm in height.
- Stomates are arranged in single lines.
- Ridges on the stems number between 7 and 16.
- Sheaths are black or black-girdled with a white distal portion.
Ecological Role
- Often mistaken for smaller forms of Equisetum hyemale.
Further Information
- Integrated Taxonomic Information System (ITIS): TSN 181785
- Interim Register of Marine and Nonmarine Genera
- Tropicos.org
- Australian Plant Name Index
- NYBG Virtual Herbarium
- JSTOR Plant Science