Common Name: HORSETAIL FAMILY Habit: Perennial herb from rhizome. Stem: annual to perennial herb, generally erect, of 2 kinds (sterile, fertile) or not; internodes with lengthwise alternating ridges and grooves, hollow except at nodes, branches 0 or whorled, alternate leaves. Leaf: scale-like, whorled, fused into nodal sheath with as many teeth as leaves, generally not green. Sporangia: several on inner surface of peltate scales that are clustered into a terminal cone; spores of 1 kind, spheric, green, unmarked, with 4 strap-like appendages. Genera In Family: 1 genus, 15 species: worldwide except Australia, New Zealand. eFlora Treatment Author: Robert E. Preston & Richard L. Hauke Scientific Editor: Alan R. Smith, Thomas J. Rosatti.
Etymology: (Latin: horse, bristle, from roots of Equisetum fluviatile L.)
Equisetum ×ferrissii Clute
NATIVE Stem: annual to perennial herb, of 1 kind, 20--180 cm, green; sheath 7--17 mm, 3--12 mm wide, often with dark bands; teeth 14--32, deciduous or persistent; branches 0. Sporangia: cone tip pointed; spores white, misshapen. Ecology: Moist, sandy or gravelly areas; Elevation: < 3000 m. Bioregional Distribution: NCo, KR, NCoRO, CaRF, SNH, GV, CW (exc SCoRI), SCo, SnGb, PR (exc SnJt), DMtns; Distribution Outside California: to British Columbia, eastern United States. Note: Hybrids between Equisetum hyemale, Equisetum laevigatum, reproducing vegetatively from fragmented stems, sometimes forming large populations, sometimes at great distance from parents. Jepson eFlora Author: Robert E. Preston & Richard L. Hauke Index of California Plant Names (ICPN; linked via the Jepson Online Interchange) Previous taxon: Equisetum arvense Next taxon: Equisetum hyemale subsp. affine
Citation for this treatment: Robert E. Preston & Richard L. Hauke 2012, Equisetum ×ferrissii, in Jepson Flora Project (eds.) Jepson eFlora, https://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=24419, accessed on April 19, 2024.
Citation for the whole project: Jepson Flora Project (eds.) 2024, Jepson eFlora, https://ucjeps.berkeley.edu/eflora/, accessed on April 19, 2024.
No expert verified images found for Equisetum ×ferrissii.
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(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurence).
Data provided by the participants of the
Consortium of California Herbaria.
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