CNPS.ORG Inventory of Rare and Endangered Plants - 7th edition interface
v7-16jul 7-14-16
Status: record calamagrostis_crassiglumis - Wed, Jul. 27, 2016 03:43 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?     S2: 6-20 occurrences OR 1,000-3,000 individuals OR 2,000-10,000 acres
global rank
G3Q      ranking system key
Where did the "RED" code go?
CA state listingNone  
federal listingNone  
where found
(12/2) v7 maps currently unavailable - use link below for v8 details and maps

Topographic quads (6):
Drakes Bay (485C) 3812218, Sebastopol (502A) 3812247, Inglenook (585D) 3912357, Fern Canyon (706A) 4112441, Sister Rocks (723B) 4112462, 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)
counties map
CNDDB Quick Viewer
Web application for exploring the CNDDB elements reported at the quad level.
(broadband recommended)
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 - Details for this taxon, including GIS and other 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). 2016. Inventory of Rare and Endangered Plants (online edition, v7-16jul). California Native Plant Society. Sacramento, CA. Accessed on Wed, Jul. 27, 2016 from

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