CPC Plant Profile: Mohave Tarplant
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Plant Profile

Mohave Tarplant (Deinandra mohavensis)

This shot of the tarplant features its yellow flowers. Photo Credit: Michael Wall
Description
  • Global Rank: G2 - Imperiled
  • Legal Status: N/A
  • Family: Asteraceae
  • State: CA
  • Nature Serve ID: 145787
  • Date Inducted in National Collection: 09/18/2021

Hemizonia mohavensis was considered extinct for over 50 years, as historical collections of this plant came from a three locations, including one in the San Jacinto Mountains and another on a sand bar along the Mojave River on the north slope of the San Bernardino Mountains in San Bernardino County, California. All of this original habitat was altered by flood control methods and by off road vehicle activity, and the species disappeared from the records. The Mohave tarplant was rediscovered in 1994 in the San Jacinto Mountains. Further searching has found a number of other populations on different mountain ranges within California, and this species is now considered stable. (Stephenson 1999) The species is a sparsely branched, aromatic annual herb with yellow flowers.

Participating Institutions
Updates
Center for Plant Conservation
  • 08/18/2021
  • Orthodox Seed Banking

In 2021, CPC contracted California Botanic Garden to recollect seed from a population currently held in long term orthodox seed storage as part of an IMLS-funded seed longevity experiment. The National Laboratory for Genetic Resources Preservation will evaluate how germination tested viability and RNA Integrity of seed lots decline over time in storage.

  • 09/01/2020
  • Orthodox Seed Banking

Based on an September 2020 extract of the California Plant Rescue Database, California Botanic Garden holds 21 accessions of Deinandra mohavensis in orthodox seed collection. There are as many as 185883 seeds of this species in their collection - although some may have been used for curation testing or sent to back up.

  • 08/05/2020
  • Seed Collection

Based on an August 2020 extract of the California Plant Rescue Database, California Botanic Garden has collected 10 seed accessions of Deinandra mohavensis from 8 plant occurrences listed in the California Natural Diversity Database. These collections together emcompass 481 maternal plants

Nature Serve Biotics
  • 05/02/2017

Endemic to California, Hemizonia mohavensis was rediscovered in 1994 and is known from less than 70 occurrences, some of which have not been recently observed.

  • 01/01/2010

Found in a number of locations in California.

  • 01/01/2010

None known.

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Photos
Nomenclature
Taxon Deinandra mohavensis
Authority (D.D. Keck) B.G. Baldw.
Family Asteraceae
CPC Number 2216
ITIS 780282
USDA DEMO5
Common Names Mohave tarplant | Mojave tarweed
Associated Scientific Names Hemizonia mohavensis | Deinandra mohavensis
Distribution Has been documented in the San Jacinto Mountain, on Baldy Mountain, Poppet Flat, Palomar Mountains (San Diego County) in the vicinity of Indian Flats and in Chihuahua Valley, north of Warner Springs,
State Rank
State State Rank
California S2
Habitat

Sandy areas along the Mojave River.

Ecological Relationships

None known.

Pollinators
Common Name Name in Text Association Type Source InteractionID
Bees
Honey bees honey bees Suspected Pollinator Floral Link
Beetles
Small beetles Suspected Pollinator Floral Link

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