Polygonum polygaloides ssp. esotericum
Common Name: Modoc County knotweed
Family: Polygonaceae
Synonyms: Polygonum esotericum
Element Code: PDPGN0L1Y2
Full Name: Polygonum polygaloides Meisn. ssp. esotericum (Wheeler) Hickman

2000 Robert E. Preston, Ph.D.
Biology Glossary
Rarity Status Glossary
Occurrence Data from CDFW
California Natural Diversity Database Glossary
  • Total # of Known Element Occurrences: 42
  • Element Occurrence Ranks:
    A B C D X U
    5 10 2 0 0 25
  • Population Status:
    >20 yrs
    <=20 yrs
    31 11
  • Presence:
    Present Extant Possibly Extirpated Presumed Extirpated
    42 0 0
Notes Glossary
  • changed from 1B.1 to 1B.3 on 2017-12-13
    Possibly threatened by grazing, trampling, road maintenance, and non-native plants. Intermediates to ssp. confertiflorum are common, especially on Modoc Plateau to OR. Difficult to distinguish pure stands of ssp. esotericum in CA; needs further study. Only occurrences that mostly contain P. p. ssp. esotericum are included. See Rhodora 40(476):310-312 (1938) for original description, and MadroƱo 31(4):251 (1984) for revised nomenclature.
  • 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: 2017-12-13
Location Glossary
  • Elevation: 885 - 1690 meters
  • California Endemic: no
  • Other States: Oregon
  • California Counties and Islands:   name (code)
    Lassen (LAS),  Modoc (MOD),  Plumas (PLU),  Shasta (SHA),  Sierra (SIE)
  • Quads:   name (DWR code) USGS code
    Antelope Valley (571A) 3912063,  Calpine (571B) 3912064,  Reconnaissance Peak (587D) 3912073,  Holbrook Canyon (675D) 4112015,  Lookout (677B) 4112122,  Burney Falls (679C) 4112116,  Washington Mtn. (693B) 4112048,  Crank Mountain (694B) 4112142,  Whitehorse (695C) 4112134,  Davis Creek (708A) 4112063,  Whittemore Ridge (709B) 4112066,  Boles Meadows East (710A) 4112067,  Boles Meadows West (710B) 4112068,  Ambrose (710C) 4112058,  Jacks Butte (710D) 4112057,  Rimrock Lake (711B) 4112162,  Spaulding Butte (711C) 4112152,  Knobcone Butte (711D) 4112151,  Lake Annie (724A) 4112081,  Mt. Bidwell (724B) 4112082,  Pease Flat (726A) 4112085,  Beaver Mtn. (726B) 4112086,  South Mtn. (726C) 4112076,  McGinty Reservoir (726D) 4112075
  • 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 1397
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 http://www.rareplants.cnps.org [accessed ].

3912063=Antelope Valley (571A) 3912063;3912064=Calpine (571B) 3912064;3912073=Reconnaissance Peak (587D) 3912073;4112015=Holbrook Canyon (675D) 4112015;4112122=Lookout (677B) 4112122;4112116=Burney Falls (679C) 4112116;4112048=Washington Mtn. (693B) 4112048;4112142=Crank Mountain (694B) 4112142;4112134=Whitehorse (695C) 4112134;4112063=Davis Creek (708A) 4112063;4112066=Whittemore Ridge (709B) 4112066;4112067=Boles Meadows East (710A) 4112067;4112068=Boles Meadows West (710B) 4112068;4112058=Ambrose (710C) 4112058;4112057=Jacks Butte (710D) 4112057;4112162=Rimrock Lake (711B) 4112162;4112152=Spaulding Butte (711C) 4112152;4112151=Knobcone Butte (711D) 4112151;4112081=Lake Annie (724A) 4112081;4112082=Mt. Bidwell (724B) 4112082;4112085=Pease Flat (726A) 4112085;4112086=Beaver Mtn. (726B) 4112086;4112076=South Mtn. (726C) 4112076;4112075=McGinty Reservoir (726D) 4112075