CNPS.ORG Inventory of Rare and Endangered Plants - 7th edition interface
v7-18mar 3-19-18
Status: record calamagrostis_crassiglumis - Sun, Nov. 28, 2021 18:57 ET c
Calamagrostis crassiglumis
common nameThurber's reed grass
CalPhotos image
more photos
© 2000 Doreen L. Smith  Follow image link for photo data.
life form rhizomatous herb
CA Rare Plant Rank
List 2B.1
LIST 2B: Rare, threatened, or endangered in California, but more common elsewhere.
     0.1: Seriously endangered in California
state rank
S2      ranking system key
global rank
G3Q      ranking system key
Where did the "RED" code go?
CA state listingNone  
federal listingNone  
where found
MAPS - Use v8 link below.

Topographic quads (14):
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 Mountain (739B) 4112388, High Divide (740A) 4112481, Crescent City (740C) 4112472
quad data info

Counties, states, regions:
Del Norte (DNT), Humboldt (HUM), Mendocino (MEN), Marin (MRN), Sonoma (SON), Arizona (AZ), Colorado (CO), Idaho (ID), New Mexico (NM), Nevada (NV), Oregon (OR), Utah (UT), Washington (WA), Wyoming (WY)
A reminder: Species not recorded for a given area may nonetheless be present, especially where favorable conditions occur.
CNPS habitats•Coastal scrub (CoScr)(mesic)
•Marshes and swamps (MshSw)(freshwater)
blooming period May-Aug  
elevation range10 - 60 meters
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.
full nameCalamagrostis crassiglumis Thurb.
Version 8    INVENTORY VERSION 8 interface for this taxon, including GIS and more links

Additional information:
standard acronym  CACR Element Code  PMPOA17070
CalFlora species this taxon    CalFlora genus related taxa
Jepson Online Jepson Interchange  Jepson Manual and other resources
Google search
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Suggested citation: California Native Plant Society (CNPS). 2018. Inventory of Rare and Endangered Plants (online edition, v7-18mar). California Native Plant Society. Sacramento, CA. Accessed on Sun, Nov. 28, 2021 from

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