Equisetum ×ferrissii

Family (Traditional)Equisetaceae
Species:Equisetum ×ferrissii Clute
Common NameFerriss Scouring Rush
Growth Habitfern ally
Plant Notes**
CharacteristicsArmaments: No; Milky Sap: No; Photosynthetic: Yes; Stipules: No; Woody Herbaceous: Herbaceous; Duration: Perennial; General Ecology: Terrestrial; Growth Habit: fern ally; Region of Origin: North America; Reproductive Phenology: May; Reproductive Phenology: June; Reproductive Phenology: July; Reproductive Phenology: August; Leaf Arrangement: whorled; Leaf Complexity: simple; Leaf Dissection: 0; Leaf Fragrance: No; Leaf Persistance: Evergreen; Leaf Petiole Type: sessile; Leaf Rank: N/A; Leaf Type: scale-like; Leaf Venation: one-veined; Leaflet Margins: entire; Leaflet Number: 0; Anther Type: N/A; Carpel Number/Pistil: N/A; Fruit Complexity: N/A; Fruit Type: N/A; Fruit Wet/Dry: N/A; Hypanthium Present: No; Inflorescence Position: N/A; Inflorescence Types: N/A; Ovary Position: N/A; Overall Flower Symmetry: N/A; Ovules per Carpel: N/A; Perianth Present: No; Petal Fusion: N/A; Petal Number: N/A; Pistil Complexity: N/A; Pistil Number: N/A; Placentation Type: N/A; Sepal Fusion: N/A; Sepal Number: N/A; Sexuality: N/A; Sporangium Arrangement: strobilus; Stamen Number: N/A; Tepal Number: N/A
C value
StatusNative; AGCP (FACW), EMP (FACW) (NWPL); TN[SNA] KY[SNR] (State Rank); GNA (Global Rank)
Specimen(s) View and Download Specimen Details »

** Not applicable or data not available.

Currently no photos are available for this plant.

Species Distribution Map

This species has been reported in the counties highlighted in the interactive distribution map below. Click on a county to display the its name. Click the question mark icon () to view additional information about the ecoregions shown. In the map legend, there are links to toggle the visibility of the ecoregions and/or their labels. In addition, clicking on an ecoregion name will highlight that region on the map.

  • State Boundaries
  • Counties
  • Counties - Species Present
  • Southeastern Plains
    • Blackland Prarie
  • Blue Ridge Mountains
  • Ridge and Valley
  • Cumberland Plateau
  • Cumberland Mountains
  • Allegheny Plateau
  • Interior Plateau
    • Bluegrass Region
    • Nashville Basin
    • Pennyroyal Karst Plain
    • Western Highland Rim
    • Eastern Highland Rim


SynonymFull Citation
Equisetum ferrissii Equisetum × ferrissii Clute
Equisetum ferrissii Equisetum X ferrissii Clute (pro sp.)
Equisetum ferrissii Equisetum ferrissii Clute
Equisetum hyemale var. elatum Equisetum hyemale var. elatum (Engelm.) Morton
Equisetum hyemale var. intermedium Equisetum hyemale var. intermedium A.A. Eat.
Equisetum intermedium Equisetum intermedium (A.A. Eat.) Rydb.

Specimens and Distribution

This species has been reported in the following counties by the herbaria listed. An overview of the individual specimens are provided in the table that follows. Click on the accession number to view details; click on column headers to sort.

Counties included on distribution map: Menifee (KY), Powell (KY), Carter (TN), Washington (TN), White (TN)

Herbaria represented by specimen data listed below: EKY, TENN

Range of years during which specimens were collected: 1935 - 1987

Accession No. (click for full details) County State Coll. Date Collector &
Collection No.
Herbarium &
Herbarium Name Used
31234100460292 Powell Kentucky 14 Jul 1985 S. L. Weber
Equisetum X ferrissii
31234100460284 Menifee Kentucky 21 Jun 1987 C. Brown
Equisetum X ferrissii
TENN-V-0001674 Carter Tennessee 20 Jul 1954 R. L. James
Equisetum ferrissii
TENN-V-0001672 White Tennessee 31 Jul 1947 chR. E. Shanks, E. Clebsch, A. J. sharp
Equisetum ferrissii
TENN-V-0001673 Washington Tennessee 24 Aug 1941 Jesse M. Shaver
Equisetum ferrissii
TENN-V-0001675 Carter Tennessee 15 Jul 1935 LR Hesler
Equisetum ferrissii
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