Lilaeopsis masonii Mathias & Constance (1977:81)

Mason's lilaeopsis



Taxonomy & Nomenclature

Invalid (synonym of L. occidentalis) (Fiedler et al., 2011:140; POWO, 2023)


Conservation Status

Invalid (synonym of L. occidentalis) (Fiedler et al., 2011:140; POWO, 2023)

Rediscovered in 1977 (Smith & York, 1984:40), prior to synonymisation (Fiedler et al., 2011:140; POWO, 2023)



California, USA


Biology & Ecology










Ayensu, E. S. and Defilipps, R. A. (1978). Endangered and Threatened Plants of the United States: 1-403. Smithsonian Institution and WWF-US, Washington DC.

Fiedler, Peggy Lee, Crumb, Esa K. and Knox, A Kate. (2011). Reconsideration of the Taxonomic Status of Mason's Lilaeopsis – A State-Protected Rare Species in California. Madroño 58: 131-144.

Humphreys, Aelys M., Govaerts, Rafaël, Ficinski, Sarah Z., Lughadha, Eimear Nic and Vorontsova, Maria S. (2019). Global dataset shows geography and life form predict modern plant extinction and rediscovery. Nature Ecology & Evolution 3: 1043-1047. [Supplementary Dataset 1]

POWO. (2023). Lilaeopsis occidentalis J.M.Coult. & Rose. Plants of the World Online (online resource). Royal Botanic Gardens, Kew, United Kingdom. Available at: [Accessed 13 December 2023]

Smith, James Payne, Jnr. (ed.) and York, Richard (DEM). (1984). Inventory of rare and endangered vascular plants of California. Special Publication No. 1 (3rd edition). Berkeley, California: California Native Plant Society. xviii + 174 pp.


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