Two new subspecies of Sidalcea hickmanii (Malvaceae) in California

Steven R. Hill

Research output: Contribution to journalArticlepeer-review


Revised treatments for Sidalcea for the upcoming Second Edition of the Jepson Manual and the Flora of North America have led to the discovery of several additional taxa. Sidalcea hickmanii subsp. napensis and subsp. pillsburiensis are described as new from north- ern California. As with the other four described subspecies, the two new taxa are found in very small isolated populations in upland areas of open chaparral vegetation, the former from Napa County, and the latter from Lake County. They may represent relict popula- tions. Unlike most other populations of the species, the two new taxa are not necessarily associated with serpentine. The two new subspecies, and the others, may be vulnerable to grazing, foraging and human-caused changes in their environments.
Original languageEnglish (US)
Pages (from-to)783-791
Number of pages9
JournalJournal of the Botanical Research Institute of Texas
Issue number2
StatePublished - Dec 9 2008


  • INHS
  • Malvaceae
  • Sidalcea hickmanii
  • California
  • North America
  • Rare plants

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Plant Science


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