Identity
Unique IDELEMENT_GLOBAL.2.159392
Element CodePDCRA06010
Record TypeSPECIES
ClassificationSpecies
Classification StatusStandard
Name CategoryVascular Plant
Endemicoccurs (regularly, as a native taxon) in multiple nations
KingdomPlantae
PhylumAnthophyta
ClassDicotyledoneae
OrderRosales
FamilyCrassulaceae
GenusGraptopetalum
Other Common NamesBartram Stonecrop (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 Date2021-09-27
Change Date2021-09-27
Edition Date2021-09-27
Edition AuthorsD. Gries (1997), rev. C. Nordman (2021).
Threat ImpactHigh
Range Extent20,000-200,000 square km (about 8000-80,000 square miles)
Number of Occurrences21 - 80
Rank ReasonsGraptopetalum bartramii is known from isolated populations in mountains of the Sky Islands in Cochise, Pima and Santa Cruz Counties, in southeastern Arizona, and in the mountains of Chihuahua and Sonora in northern Mexico. There are less than 4,000 adult plants known, and there are high or very high threats to the remaining populations, including various threatening effects of drought and wildfire to these plants.
Range Extent CommentsGraptopetalum bartramii occurs in the southeastern Arizona in the United States, and in Chihuahua and Sonora in Mexico. The range extent is estimated to be 40,000 square kilometers. It occurs in various isolated mountain ranges known as the Sky Islands (NatureServe Network 2021, SEINet 2021, USFWS 2018).
Occurrences CommentsAs of 2021, there were 50 extant populations of Graptopetalum bartramii across nine mountain ranges in southeastern Arizona and three mountain ranges in nearby Mexico (USFWS 2021).
Threat Impact CommentsThe primary threats to Graptopetalum bartramii are the loss of water in nearby drainages due to mining and drought, and high severity wildfires (and associated erosion, sedimentation and loss of shading canopy trees). Other threats include trampling (including from recreation impacts and from livestock), flooding, predation of individual plants, increasing populations of invasive exotic grasses, and illegal collection. Several threats are expected to become more severe due to climate change (USFWS 2018).