Plagiobothrys diffusus (Greene) I.M.Johnst. (1932:77)
San Francisco popcornflower
Taxonomy & Nomenclature
Synonyms: Allocarya diffusa Greene in Pittonia 1: 14 (1887); Krynitzkia diffusa (Greene) Rattan in Anal. Key West Coast Bot.: 58 (1898); Plagiobothrys torreyi var. diffusus (Greene) I.M. Johnston [used by NatureServe]
Conservation Status
Rediscovered (by implication) (Humphreys et al., 2019; POWO, 2024)
Treated as a synonym of P. reticulatus rossianorum by Humphreys et al. (2019) who are only concerned with taxa currently (or previously if invalid) thought to be extinct. As the species is accepted today and not considered extinct (POWO, 2024), it was presumably rediscovered at some point. There is a gap in Calflora's records from 1887 until 1933, and again from 1941 until 1982.
Distribution
North America
Biology & Ecology
Hypodigm
Media
References
CPC. (1990). Centre for plant conservation data for North American plants database. CPC, Centre for plant conservation.
Hickman, J. C. (ed.). (1993). The Jepson manual: Higher plants of California. University of California Press, Berkeley, CA. 1400 pp.
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. https://doi.org/10.1038/s41559-019-0906-2 [Supplementary Dataset 1]
Johnston, Ivan M. (1933). Studies in the Boraginaceae, IX. 1. The Allocarya section of Plagiobothrys in the western United States. 2. Notes on various borages of the western United States. Contributions from the Arnold Arboretum of Harvard University III: 1-102.
Kartesz, J. T. (1999). A synonymized checklist and atlas with biological attributes for the vascular flora of the United States, Canada, and Greenland. First edition. In: Kartesz, J.T., and C.A. Meacham. Synthesis of the North American Flora, Version 1.0. North Carolina Botanical Garden, Chapel Hill, N.C.
POWO. (2024). Plants of the World Online (online resource). Facilitated by the Royal Botanic Gardens, Kew, United Kingdom. Available at: https://powo.science.kew.org/ [Accessed 25 April 2024]
Walter, Kerry S. and Gillett, Harriet J. (eds.). (1998). 1997 IUCN Red List of Threatened Plants. Compiled by the World Conservation Monitoring Centre. Gland, Switzerland & Cambridge, UK: IUCN – The World Conservation Union. lxiv + 862 pp.