Calamagrostis crassiglumis
Common Name: Thurber's reed grass
Family: Poaceae
Element Code: PMPOA17070
Full Name: Calamagrostis crassiglumis Thurb.

2013 Vernon Smith
Biology Glossary
Rarity Status Glossary
Occurrence Data from CDFW
California Natural Diversity Database Glossary
  • Total # of Known Element Occurrences: 15
  • Element Occurrence Ranks:
    A B C D X U
    1 2 2 0 0 10
  • Population Status:
    >20 yrs
    <=20 yrs
    10 5
  • Presence:
    Present Extant Possibly Extirpated Presumed Extirpated
    15 0 0
Notes Glossary
  • Threatened by grazing at Pt. Reyes NS. A synonym of C. stricta ssp. inexpansa in TJM (1993) and TJM 2; distinguished from this taxon in glume texture and shape: C. crassiglumis has thickened glumes that are rounded towards the base (vs. membranous, not thickened glumes that are keeled towards the base), generally shorter ligules (1-3 mm long vs. 2-5.5(6) mm long), and generally shorter panicles (3-8 cm long vs. (5)8-15 cm long in C. stricta ssp. inexpansa). See Botany of California 2:281 (1880) for original description.
  • To submit rare plant observation data, use the CNDDB field survey form. Please see also the CNPS Rare Plant Data page.
  • Date Added: 1980-01-01
  • Last Update: 2013-09-16
Location Glossary
  • Elevation: 10 - 60 meters
  • California Endemic: no
  • Other States: Arizona, Colorado, Idaho, New Mexico, Nevada, Oregon, Utah, Washington, Wyoming
  • California Counties and Islands:   name (code)
    Del Norte (DNT),  Humboldt (HUM),  Mendocino (MEN),  Marin (MRN),  Sonoma (SON)
  • Quads:   name (DWR code) USGS code
    San Rafael (467A) 3712285,  Drakes Bay (485C) 3812218,  Sebastopol (502A) 3812247,  Bodega Head (503D) 3812331,  Mendocino (569D) 3912337,  Inglenook (585D) 3912357,  Ah Pah Ridge (705B) 4112348,  Holter Ridge (705C) 4112338,  Fern Canyon (706A) 4112441,  Orick (706D) 4112431,  Sister Rocks (723B) 4112462,  High Plateau Mtn. (739B) 4112388,  High Divide (740A) 4112481,  Crescent City (740C) 4112472
  • Notes:
      Definitions of codes preceding a county and/or quad:
      * Presumed extirpated
      ? Uncertain about distribution or identity
      ?* Uncertain about distribution, but presumed extirpated if once present
      (?) Occurrence confirmed, but possibly extirpated
      Species may be present in other areas where conditions are favorable. This data should NOT be substituted for pre-project review or for on-site surveys.
Presumed Extant Presumed Extirpated or Unknown 370
Links to Leading Resources of Taxon Information
Suggested Citation
California Native Plant Society, Rare Plant Program. . Inventory of Rare and Endangered Plants of California (online edition, v8-03). Website [accessed ].

3712285=San Rafael (467A) 3712285;3812218=Drakes Bay (485C) 3812218;3812247=Sebastopol (502A) 3812247;3812331=Bodega Head (503D) 3812331;3912337=Mendocino (569D) 3912337;3912357=Inglenook (585D) 3912357;4112348=Ah Pah Ridge (705B) 4112348;4112338=Holter Ridge (705C) 4112338;4112441=Fern Canyon (706A) 4112441;4112431=Orick (706D) 4112431;4112462=Sister Rocks (723B) 4112462;4112388=High Plateau Mtn. (739B) 4112388;4112481=High Divide (740A) 4112481;4112472=Crescent City (740C) 4112472