Agrostis hendersonii
Common Name: Henderson's bent grass
Family: Poaceae
Synonyms: Agrostis microphylla var. hendersonii
Element Code: PMPOA040K0
Full Name: Agrostis hendersonii Hitchc.

2005 Steve Matson
Biology Glossary
Rarity Status Glossary
Occurrence Data from CDFW
California Natural Diversity Database Glossary
  • Total # of Known Element Occurrences: 26
  • Element Occurrence Ranks:
    A B C D X U
    6 5 1 0 1 13
  • Population Status:
    >20 yrs
    <=20 yrs
    14 12
  • Presence:
    Present Extant Possibly Extirpated Presumed Extirpated
    25 1 0
Notes Glossary
  • Move to List 1B? Field surveys needed. Identity of BUT Co. plants remains questionable. One occurrence extirpated by construction of Comanche Reservoir; also threatened by development. Candidate for state listing in OR, but presumed extinct there. Very similar to A. microphylla; study needed. Chromosome distinction exists between these two taxa; see Bulletin of the Torrey Botanical Club 72:541-549 (1945) and Southwestern Naturalist 10:211-213 (1965) for information. See Journal of the Washington Academy of Sciences 20(15):381 (1930) for original description, MadroƱo 3(6):230 (1936) for first CA record, and Leaflets of Western Botany 3(12):258 (1943) for second CA record.
  • To submit rare plant observation data, use the CNDDB field survey form. Please see also the CNPS Rare Plant Data page.
  • Date Added: 1974-01-01
  • Last Update: 2010-03-15
Location Glossary
  • Elevation: 70 - 305 meters
  • California Endemic: no
  • Other States: Oregon
  • California Counties and Islands:   name (code)
    Butte (BUT) ?,  Calaveras (CAL),  Merced (MER),  Napa (NAP),  Shasta (SHA),  Tehama (TEH),  Tuolumne (TUO)
  • Quads:   name (DWR code) USGS code
    Haystack Mtn. (421A) 3712043,  Yosemite Lake (421B) 3712044,  New Melones Dam (459A) 3712085,  Wallace (477B)* 3812028,  Mt. George (499C) 3812232,  Brush Creek (575A)? 3912163,  Berry Creek (575B) 3912164,  Corning (594B) 3912282,  Henleyville (595A) 3912283,  West of Gerber (611D) 4012213,  Tuscan Buttes Ne (628A)? 4012241,  Balls Ferry (628B) 4012242,  Bend (628C) 4012232,  Dales (628D) 4012231,  Oak Run (646A) 4012261,  Bella Vista (646B) 4012262,  Palo Cedro (646C) 4012252,  Project City (647A) 4012263,  Enterprise (647D) 4012253
  • 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.
Includes unprocessed quads for CRPR 3 and 4 plants; unprocessed location data has not been quality controlled and may contain errors.
Presumed Extant Presumed Extirpated or Unknown 78
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 ].

3712043=Haystack Mtn. (421A) 3712043;3712044=Yosemite Lake (421B) 3712044;3712085=New Melones Dam (459A) 3712085;3812028=Wallace (477B)* 3812028;3812232=Mt. George (499C) 3812232;3912163=Brush Creek (575A)? 3912163;3912164=Berry Creek (575B) 3912164;3912282=Corning (594B) 3912282;3912283=Henleyville (595A) 3912283;4012213=West of Gerber (611D) 4012213;4012241=Tuscan Buttes Ne (628A)? 4012241;4012242=Balls Ferry (628B) 4012242;4012232=Bend (628C) 4012232;4012231=Dales (628D) 4012231;4012261=Oak Run (646A) 4012261;4012262=Bella Vista (646B) 4012262;4012252=Palo Cedro (646C) 4012252;4012263=Project City (647A) 4012263;4012253=Enterprise (647D) 4012253