Small population size
Expansion of Kneeland Airport and CDFFP helitack base;
Spread of exotic species.
The only known occurrence of Kneeland Prairie penny-cress includes five relatively distinct groups of plants all located within 300 m (980 ft) of each other. The species occupies an area divided by the Kneeland Airport and Mountain View Road. The known population consists of approximately 5,300 individuals. The five colonies occupy an estimated 0.3 ha (0.8 ac). (Recovery Plan)
Research necessary to enable maintenance and expansion of the existing population and establishment of new colonies. Critical aspects of the biology of Thlaspi californicum need to be studied, including genetic diversity within the species, seed viability, propagation methods, and specifics of the species habitat requirements.
Development and implementation of a repatriation/introduction plan.
Restoration or creation of additional suitable habitat for Thlaspi californicum as opportunities become available.
Determine optimum methods for seed germination and propagation.
Long term seed bank.
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