Jepson eFlora: Taxon page
Key to families | Table of families and genera
Previous taxon Index to accepted names and synonyms:
| A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
Next taxon
Equisetum ×ferrissii
FERRISS' HORSETAIL

Higher Taxonomy
Family: EquisetaceaeView Description 

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.
Genus: EquisetumView DescriptionDichotomous Key

Common Name: HORSETAIL, SCOURING RUSH

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.
eFlora Treatment Author: Robert E. Preston & Richard L. Hauke
Jepson Online Interchange

Previous taxon: Equisetum arvense
Next taxon: Equisetum hyemale subsp. affine

Name Search

Contact/Feedback

Citation for this treatment: Robert E. Preston & Richard L. Hauke 2016. Equisetum ×ferrissii, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=24419, accessed on August 28, 2016.

Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on August 28, 2016.


Geographic subdivisions for Equisetum ×ferrissii:
NCo, KR, NCoRO, CaRF, SNH, GV, CW (exc SCoRI), SCo, SnGb, PR (exc SnJt), DMtns;
Markers link to CCH specimen records. Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues. Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
READ ABOUT YELLOW FLAGS
map of distribution 1
(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).

View elevation by latitude chart
Data provided by the participants of the Consortium of California Herbaria.
View all CCH records

CCH collections by month

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa.
Blue line denotes eFlora flowering time.