Streptanthus lemmonii S.Watson (1890:125)



Taxonomy & Nomenclature

Listed twice by (Humphreys et al., 2019), under S. lemmonii (extinct) and erroneously under the different taxon Caulanthus lemmonii (as a synonym of Caulanthus coulteri lemmonii).


Conservation Status

Extinct (Humphreys et al., 2019; POWO, 2024) or Invalid (synonym of S. tortuosus) (Knapp et al. 2020)



Santa Catalina Mountains, Arizona, USA


Biology & Ecology










Christenhusz, M. and Govaerts, R. (2023). Uitgestorven. Op plantenjacht rond de wereld: 1-511. Sterck & De Vreese.

CPC. (1992). Centre for plant conservation data for North American plants database. CPC, Centre for plant conservation.

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]

Knapp, Wesley M., Frances, Anne, Noss, Reed, Naczi, Robert F. C., Weakley, Alan, Gann, George D., Baldwin, Bruce G., Miller, James, McIntyre, Patrick, Mishler, Brent D., Moore, Gerry, Olmstead, Richard G., Strong, Anna, Gluesenkamp, Daniel and Kennedy, Kathryn. (2020). Regional records improve data quality in determining plant extinction rates. Nature Ecology & Evolution 4: 512-514.

POWO. (2024). Plants of the World Online (online resource). Facilitated by the Royal Botanic Gardens, Kew, United Kingdom. Available at: [Accessed 4 May 2024]


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