Identity
Unique IDELEMENT_GLOBAL.2.156973
Element CodePDLAM0M0H0
Record TypeSPECIES
ClassificationSpecies
Classification StatusStandard
Name CategoryVascular Plant
Endemicendemic to a single state or province
KingdomPlantae
PhylumAnthophyta
ClassDicotyledoneae
OrderLamiales
FamilyLamiaceae
GenusHedeoma
Other Common NamesTodsen's false pennyroyal (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 Date2024-07-01
Change Date1991-03-25
Edition Date2024-07-01
Edition AuthorsRoth, E.; rev. DeBruin, E., 1996., rev. A. Treher (2012), rev. N. Ventrella (2024)
Threat ImpactHigh - medium
Range Extent1000-5000 square km (about 400-2000 square miles)
Number of Occurrences6 - 20
Rank ReasonsHedeoma todsenii is a edaphic perennial herb occurring on gypseous-limestone soils in pinyon-juniper, ponderosa pine, and Douglas fir communities of western North America, where it is found in the San Andres and Sacramento Mountains of southern New Mexico. It is known from approximately eleven occurrences (47 populations), ranging from a few thousand to several dozen plants, occurring primarily on federally-managed lands. This species is threatened by fire suppression and increasing density of pinyon-juniper woodlands, wildfire, and drought due to climate change. Hedeoma todsenii also has some significant intrinsic vulnerabilities; including, low flowering frequency and inbreeding depression that is likely contributing to low seed set.
Range Extent CommentsHedeoma todsenii occurs in western North America, where it is found in Sierra and Otero counties of southern New Mexico in the San Andres Mountains and Sacramento Mountains (McDonald 1999). Range extent was estimated to be 1,489 square kilometers using herbarium specimens and NatureServe network occurrence data collected between 1978 and 2015 (NatureServe 2024, SEINet 2024). Historic (pre-1993) population locations were used, as all known populations in the San Andres Mountains and most of the populations in the Sacramento Mountains have been verified as extant since at least 2017 (USFWS 2022).
Occurrences CommentsAs of 2022, a total of 47 Hedeoma todsenii populations were documented: 32 in the Sacramento Mountains, and an additional fifteen populations in the San Andres Mountains (USFWS 2022). By applying a 1 km separation distance to population location data from herbarium specimens and NatureServe network occurrence data documented between 1978 and 2015, there are eleven estimated occurrences (NatureServe 2024, SEINet 2024). The New Mexico Natural Heritage Program tracks seven occurrences of this species (NatureServe 2024),.
Threat Impact CommentsHedeoma todsenii populations are potentially threatened by trampling and habitat degradation due to livestock grazing and expanded military activities in the White Sands Missile Range, and also insect herbivory (Britt 2018, USFWS 2001). Forests surrounding populations are becoming increasingly dense due to a history of fire prevention, which increases the risk of catastrophic fire, and potentially impairs flowering due to increased shading (USFWS 2022). Increased severity and frequency of drought conditions expected under climate change will likely adversely impact this species, either directly, or indirectly through impacts to this species primary pollinator, the broad-tailed hummingbird.