Identity
Unique IDELEMENT_GLOBAL.2.131357
Element CodePDMAL110A0
Record TypeSPECIES
ClassificationSpecies
Classification StatusStandard
Name CategoryVascular Plant
Endemicendemic to a single nation
KingdomPlantae
PhylumAnthophyta
ClassDicotyledoneae
OrderMalvales
FamilyMalvaceae
GenusSidalcea
Other Common NamesHickman's Mallow (EN)
Concept ReferenceKartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.
Conservation Status
Rank Method Rank calculation - Biotics v2
Review Date2021-09-08
Change Date2021-09-08
Edition Date2021-09-02
Edition AuthorsJoyal, E. (1988), rev. Treher (2021)
Threat ImpactHigh
Range Extent20,000-200,000 square km (about 8000-80,000 square miles)
Number of Occurrences21 - 80
Rank ReasonsSidalcea hickmanii occurs in southern California to southwestern Oregon in the United States. There are seven described subspecies in this species that exemplify the relict nature of its distribution, as a series of widely dispersed, small, isolated populations.Three of subspecies are endemic to a single site. Sidalcea hickmanii ssp. viridis has not been seen since 1976 despite searching. See each subspecies for additional information on threats, trends, population sizes, and global ranks.
Range Extent CommentsSidalcea hickmanii occurs in southern California to southwestern Oregon in the United States. There are seven described subspecies in this species that exemplify the relict nature of its distribution, as a series of widely dispersed, small, isolated populations. At the northern extent of the species range is Sidalcea hickmanii ssp. petraea, a single site endemic of Jackson County, Oregon.
Occurrences CommentsThree of the subspecies (Sidalcea hickmanii ssp. napensis, Sidalcea hickmanii ssp. petraea, Sidalcea hickmanii ssp. pillsburiensis) are only known from a single occurrence.
Threat Impact CommentsThe subspecies are widely distributed in California and Oregon and each is subject to a different set of threats: see each for a summary of threats and a threats assessment. Fire related threats and development, may be common across the subspecies. Fire suppression allows for the advancement of woody vegetation that outcompete and shade plants. The inappropriate timing or intensity of fires may impact the species by inhibiting reproduction (USFWS 2004).