Pascopyrum smithii

Family (Traditional)Poaceae
Species:Pascopyrum smithii (Rydb.) Barkworth & D. R. Dewey
Common NameWestern Wheatgrass
Growth Habitgraminoid
Plant Notes**
CharacteristicsArmaments: No; Milky Sap: No; Photosynthetic: Yes; Stipules: No; Woody Herbaceous: Herbaceous; Duration: Perennial; General Ecology: Terrestrial; Growth Habit: graminoid; Region of Origin: North America; Reproductive Phenology: May; Reproductive Phenology: June; Reproductive Phenology: July; Leaf Arrangement: alternate; Leaf Arrangement: basal; Leaf Complexity: simple; Leaf Dissection: 0; Leaf Persistance: Deciduous; Leaf Petiole Type: sessile; Leaf Type: grass-like; Leaf Venation: parallel; Leaflet Margins: entire; Leaflet Number: 0; Base Flower Color: Brown (incl. Maroon); Base Flower Color: Green; Fruit Dehiscence: No; Fruit Type: Caryopsis; Fruit Type: Grain; Fruit Wet/Dry: Dry; Hypanthium Present: No; Ovary Position: Superior; Overall Flower Symmetry: N/A; Perianth Present: No; Placentation Type: Parietal; Placentation Type: Basal; Sexuality: monoclinous; Sporangium Arrangement: N/A
C value
StatusNative; AGCP (FACU), EMP (UPL) (NWPL); TN[SNR] (State Rank); G5 (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
Agropyron glaucum var. occidentale Agropyron glaucum var. occidentale Scribn.
Agropyron molle Agropyron molle (Scribn. & J.G. Sm.) Rydb.
Agropyron occidentale var. molle Agropyron occidentale var. molle (Scribn. & J.G. Sm.) Scribn.
Agropyron occidentale var. occidentale Agropyron occidentale var. occidentale (Scribn.) Scribn.
Agropyron occidentale var. palmeri Agropyron occidentale var. palmeri (Scribn. & J.G. Sm.) Scribn.
Agropyron palmeri Agropyron palmeri (Scribn. & J.G. Sm.) Rydb.
Agropyron smithii Agropyron smithii Rydb.
Agropyron smithii f. molle Agropyron smithii f. molle (Scribn. & J.G. Sm.) J.M. Gillett
Agropyron smithii var. molle Agropyron smithii var. molle (Scribn. & J.G. Sm.) M.E. Jones
Agropyron smithii var. palmeri Agropyron smithii var. palmeri (Scribn. & J.G. Sm.) Heller
Agropyron smithii var. typica Agropyron smithii var. typica Waterf.
Agropyron spicatum var. palmeri Agropyron spicatum var. palmeri Scribn. & J.G. Sm.
Agropyron spicatum var. viride Agropyron spicatum var. viride Farw.
Elymus smithii Elymus smithii (Rydb.) Gould
Elytrigia smithii Elytrigia smithii (Rydb.) Nevski
Elytrigia smithii var. molle Elytrigia smithii var. molle (Scribn. & J.G. Sm.) Beetle
Elytrigia smithii var. mollis Elytrigia smithii var. mollis (Scribn. & J.G. Sm.) Beetle

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: Fulton (KY), Graves (KY), McCracken (KY), Madison (KY)

Herbaria represented by specimen data listed below: APSC, EKY, MEM

Range of years during which specimens were collected: 1956 - 1978

Accession No. (click for full details) County State Coll. Date Collector &
Collection No.
Herbarium &
Herbarium Name Used
31234100194883 Fulton Kentucky 25 Jun 1978 Raymond Athey
Elytrigia smithii
APSC0098264 Graves Kentucky 02 Jun 1972 Raymond Athey
Pascopyrum smithii
MEM006266 McCracken Kentucky 07 Jun 1970 Raymond Athey
Elymus smithii
MEM014820 Madison Kentucky 02 Jul 1956 Mary E. Wharton
Elymus smithii
MEM008395 Fulton Kentucky 18 Jun 1974 Raymond Athey
Elymus smithii
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