CNPS

CNPS Rare Plant Inventory



Taxon Details

Eriogonum umbellatum var. humistratum

Mt. Eddy buckwheat

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Photo of Eriogonum umbellatum var. humistratum
©2001 Julie Kierstead Nelson 		Photo of Eriogonum umbellatum var. humistratum
©2014 Neal Kramer 		Photo of Eriogonum umbellatum var. humistratum
©2017 Julie Kierstead Nelson

Taxon Summary:

Eriogonum umbellatum var. humistratum, commonly known as Mt. Eddy buckwheat, is a perennial herb in the Polygonaceae that is found only in California. It occurs within Alpine boulder and rock field, Chaparral, Meadows and seeps, Subalpine coniferous forest, and Upper montane coniferous forest, growing at elevations from 1700 to 2800 meters. Eriogonum umbellatum var. humistratum is ranked 4.3, Plants of Limited Distribution, A Watch List; Not very threatened in California.

  Classification

Scientific Name:
Eriogonum umbellatum Torr. var. humistratum Rev.
Common Name:
Mt. Eddy buckwheat
Family: Polygonaceae
Element Code: PDPGN086U4
USDA Plants Symbol: ERUMH2
Synonyms/Other Names:
Name Status: JEF, FNA, POWO,
IPNI, Tropicos

  Conservation Status

CA Rare Plant Rank: 4.3
Fed List: None
State List: None
Global Rank: G5T4
State Rank:
 S4
Other Status:
CRPR Changes:
Add Date: 1980-01-01
Date Edited: 2021-12-09

  Ecology and Life History

Lifeform: perennial herb
Blooming Period: May-Oct
JFMAMJJASOND
Elevation:
1700 - 2800 meters
5580 - 9185 feet
General Habitats:
  • Alpine boulder and rock field
  • Chaparral
  • Meadows and seeps
  • Subalpine coniferous forest
  • Upper montane coniferous forest
Microhabitat Details:
Microhabitat:
  • Rocky
  • Serpentine (usually)

  Notes

Notes:
Intergrades with var. polyanthum. See Phytologia 66(3):260 (1989) for original description and 66(4):341-345 (1989) for taxonomic treatment.
Threats:
Taxonomy:

  Threat List Data from the CNDDB

Threat List Total: 0
Total EOs % of EOs
EOs with Threat Listed: 0 0 %
THREAT LIST:

  Occurrence Data from the CNDDB

Total Occurrences: 0
Element Occurrence Ranks:
A B C D X U
0 0 0 0 0 0
Occurrence Status:
Historical >20 Years 0
Recent <=20 Years 0
Presence:
Presumed Extant 0
Possibly Extirpated 0
Presumed Extirpated 0

  Location

California Endemic:
California Island:
States: Name (Code)
California (CA)
California Counties and Islands: Name (Code)
Shasta (SHA), Siskiyou (SIS), Tehama (TEH), Trinity (TRI)
Quads: Name (Quad Code)
Billys Peak (4112227), Callahan (4112237), Chicken Hawk Hill (4112214), Eaton Peak (4112238), English Peak (4112342), Hotlum (4112243), Marble Mountain (4112352), Mount Eddy (4112234), Mt. Shasta (4112242), Salmon Mtn. (4112324), Scott Mountain (4112236), Smoky Creek (4012332), Solomon Peak (4012218), South China Mtn. (4112235), South Yolla Bolly (4012217), Whisky Bill Peak (4112215), Yellow Dog Peak (4112341)
Notes:
Definitions of codes following a county and/or quad:
* Presumed extirpated
(?) Occurrence confirmed, but possibly extirpated
Quad and county data is imported from the CNDDB. Species may be present in other areas where conditions are favorable. These data should NOT be substituted for pre-project review or for on-site surveys.
Regional Map

  Map

Presumed Extant
Click on quad for name. Hold Shift Key to use mouse scroll wheel

  Selected References

Other: USFS Potential Species of Conservation Concern Profile

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Suggested Citation:
California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 6 July 2025].
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