The following Participating Institutions are custodians for this species in the CPC National Collection:
University of California Botanical Garden
The conservation of Amsinckia grandiflora is fully sponsored.
Holly Forbes contributed to this Plant Profile.
The large-flowered fiddleneck is a striking annual plant, growing to 50 cm. tall and having bright orange flowers (14-20 mm. long) from April to May in northern California. It is now found in only three populations, one on private rangeland and two on the U.S. Department of Energy's Lawrence Livermore National Laboratory property (this area of the facility was used to test nuclear bomb triggers and high explosives for nearly 50 years).
Distribution & Occurrence
This species prefers deep loamy soils of sedimentary origin on mesic, north-facing slopes (Pavlik et al. 1993).
|There are two populations on Lawrence Livermore National Laboratory (LLNL) property: 1 population has between 23-400 individuals and the other has < 29 individuals. Another population of thousands of individuals on private land was recently discovered not far from the LLNL populations. An ex situ population has been established within the historic range at Black Diamond Mines Regional Preserve in Contra Costa Co.|
Conservation, Ecology & Research
Pollen transfer between plants of the same flower type (pin to pin or thrum to thrum) and self-pollination greatly reduce seed set (Ray and Chisaki; Barrett 1990). The possession of heterostyly and cryptic self-incompatibility indicates that A. grandiflora has an outbreeding mating system with a potential for high levels of heterozygosity and genetic recombination (Pavlik et al. 1993). Large-flowered fiddleneck has specific habitat requirements (deep loamy soils of sedimentary origin; mesic, north-facing slopes), and is negatively impacted by non-native species in grasslands.
Possibly by altered fire frequency
Pavlik, B.M. 1994. Demographic monitoring and the recovery of endangered plants. In: Bowles, M.L.; Whelan, C., editors. Recovery and Restoration of Endangered Species. Cambridge University Press. Cambridge. p 322-350.