CPC Plant Profile: Loch Lomond Button-celery
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Plant Profile

Loch Lomond Button-celery (Eryngium constancei)

This tiny perennial herb grows to only a height of 30 cm (12 in). Photo Credit: Holly Forbes
Description
  • Global Rank: G1 - Critically Imperiled
  • Legal Status: N/A
  • Family: Apiaceae
  • State: CA
  • Nature Serve ID: 151261
  • Date Inducted in National Collection: 08/30/1988

Loch Lomond button-celery is a low-growing annual herb with tiny white to light purple flowers found only in northern California. This species grows in the bed of a small vernal lake, surrounded by a ponderosa pine and black oak forest, in the Loch Lomond Ecological Reserve in Lake County. Another population of Loch Lomond button-celery was discovered in 1996 in two spring-fed, shallow pools in Sonoma County. A berm has been built to prevent runoff into the pools at this location from increased sedimentation due to logging in the area. A third population was discovered in Lake County in 1997. This population was threatened by soil erosion into its pool habitat due to vegetation removal along the edges; it is also at risk from planned reservoir construction (CDFG 2002).

Participating Institutions
Updates
  • 09/01/2020
  • Orthodox Seed Banking

Based on an September 2020 extract of the California Plant Rescue Database, California Botanic Garden holds 1 accessions of Eryngium constancei in orthodox seed collection. There are as many as 346 seeds of this species in their collection - although some may have been used for curation testing or sent to back up.

Nature Serve Biotics
  • 05/02/2017

Endemic to California, Eryngium constancei is known only from three occurrences in two vernal lakes in Lake County and two pools in Sonoma County. Threats are development, ORVs, foot traffic, trash dumping, and logging. This plant is very fragile; its only relatively protected site is threatened by timber harvest, ORVs and proximity to a major road.

Holly Forbes
  • 01/01/2010

Development Off-road vehicles Reservoir construction Foot traffic Trash dumping Erosion caused by logging (CDFG 2002; USFWS 1993)

Holly Forbes
  • 01/01/2010

It is known only from three populations in two vernal lakes in Lake County and two pools in Sonoma County. As with any annual species, the number of plants in each population varies from year to year. During good years there may be thousands of plants in each population (CDFG 2002).

Holly Forbes
  • 01/01/2010

None at this time.

Holly Forbes
  • 01/01/2010

A berm has been built to prevent runoff into the pools from increased sedimentation due to logging in the area at the Sonoma County location. The Lake County population was threatened by soil erosion into its pool habitat due to vegetation removal along the edges; it is also at risk from planned reservoir construction.

Holly Forbes
  • 01/01/2010

survey for additional populations monitoring protection from runoff

Holly Forbes
  • 01/01/2010

Additional seed collection for long-term storage is desirable.

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Photos
Nomenclature
Taxon Eryngium constancei
Authority Sheikh
Family Apiaceae
CPC Number 1817
ITIS 182165
USDA ERCO39
Common Names Constance's coyote-thistle | Loch Lomond button-celery | Loch Lomond coyote-thistle | Loch Lomond eryngo
Associated Scientific Names Eryngium constancei
Distribution Lake and Sonoma Counties, California
State Rank
State State Rank
California S1
Habitat

Vernal lakes and pools.

Ecological Relationships

This species grows in the bed of small vernal lakes. One population is surrounded by a ponderosa pine and black oak forest; another is bordered by Oregon oak, valley oak, and Douglas fir.

Pollinators
Common Name Name in Text Association Type Source InteractionID

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