CPC Plant Profile: Dwarf Whitethorn
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Plant Profile

Dwarf Whitethorn (Ceanothus dentatus)

Photo Credit: ©2015 Zoya Akulova
Description
  • Global Rank: G2 - Imperiled
  • Legal Status: N/A
  • Family: Rhamnaceae
  • State: CA
  • Nature Serve ID: 130780
  • Date Inducted in National Collection: 09/28/2021

In terms of conservation status, Ceanothus dentatus is an unranked species in the state of California. The Dwarf Ceanothus can be found in scattered populations along the central California coast including San Cruz and Monterey counties. It is in these communities that C. dentatus can be found among variations of pine forests and coastal chaparral. Among these habitats, C. dentatus can specifically be found wherever there is sandy, gravel-like soil. It is a popular choice for local bees and predatory insects.   

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 Ceanothus dentatus in orthodox seed collection. There are as many as 2380 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 1 seed accessions of Ceanothus dentatus from 1 plant occurrences listed in the California Natural Diversity Database. These collections together emcompass an unknown number of maternal plants

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Photos
Nomenclature
Taxon Ceanothus dentatus
Authority Torr. & A. Gray
Family Rhamnaceae
CPC Number 9001
ITIS 28462
USDA CEDE
Common Names Dwarf Ceanothus | Sandscrub Ceanothus | Dwarf Whitehorn
Associated Scientific Names Ceanothus dentatus | Ceanothus dentatus var. floribundus | Ceanothus dentatus var. dentatus | Ceanothus dentatus subsp. floribundus | Ceanothus floribundus | Ceanothus papillosus var. dentatus | Ceanothus papillosus var. floribundus
Distribution Populations are found along the central California coastline but are most abundant in Santa Cruz & Monterey counties. 
State Rank
State State Rank
California SNR
Habitat

The Dwarf Ceanothus can found in a wide range of elevations up to 1500 ft and inhabit various pine forest habitats including closed-cone, yellow-pine, and evergreen forest communities. In these habitats, it can only be found in sandy, gravel-like soil.

Ecological Relationships

C. dentatus fosters a beneficial ecological relationships with various species of pollinating bees and butterflies including Celastrina butterflies; Pale Swallowtails (Papilio eurymedon); Hedgerow Hairstreaks (Satyrium saepium); and the Pacuvius Duskywing (Erynnis pacuvius). Because it is a natural attracts such species, it is also a common food source for predatory insects.
 

Pollinators
Common Name Name in Text Association Type Source InteractionID

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