Carnegiea gigantea, Giant Saguaro

Southwest Desert Flora

Home to the plants of the Sonoran, Chihuahuan and Mojave Deserts

Cirsium ochrocentrum, Yellowspine Thistle

Pediomelum mephiticum, Skunktop

Pediomelum mephiticum, Skunktop Pediomelum mephiticum, Skunktop Pediomelum mephiticum, Skunktop

Scientific Name: Pediomelum mephiticum
Common Name: Skunktop

Also Called: Indian Breadroot

Family: Fabaceae or Leguminosae Family

Synonyms: (Psoralea mephitica)

Status: Native

Duration: Perennial

Size: Short stem, up to 4 inches (10 cm) more or less.

Growth Form: Skunktop is a forb/herb and the stems are very short and woody below, there is a taproot, rhizomes.

Leaves: Skunktop has green or silver-green leaves covered with short soft hairs, the leaves are gland dotted, palmately compound, the leaves have 5 to 9 leaflets.

Flower Color: Skunktop has blue, purple or red flowers, the fruit is a 1-seeded pod.

Flowering Season: April to June.

Elevation: 3,000 to 5,500 feet (914 - 1,676 m).

Habitat Preferences:Rocky hillsides and mesas.

Recorded Range: Skunktop is a relatively rare plant in the United States with an unusual distribution in AZ, NV and UT. In Arizona it is found in the central, eastern and northwest portions; in Nevada it is found in the southeast and in Utah it is found in the extreme southwest corner.

North America & US County Distribution Map for Pediomelum mephiticum.

North America species range map for Skunktop, Pediomelum mephiticum:

North America species range map for Skunktop, Pediomelum mephiticum:
Click image for full size map.

U.S. Weed Information: Unknown
Invasive/Noxious Weed Information: Unknown
Wetland Indicator: Unknown
Threatened/Endangered Information: Unknown

Genus Information: In North America, USDA Plants Database lists 24 species for Pediomelum. Worldwide, World Flora Online includes 56 accepted species names and a further 13 scientific names of infraspecific rank for the genus.

The genus Pediomelum was published in in 1919 by Per Axel Rydberg, (1860-1931).

In the Southwestern United States: Arizona has 8 species of Pediomelum, California has 2 species, Nevada has 3 species, New Mexico has 7 species, Texas has 12 species, Utah has 4 species. Data approximate, subject to revision.

Comments: Skunktop is not a common plant and often observed as individual specimens.

The type of variety retrosa was collected at Peach Springs, Mohave County in 1884. This particular variety has larger leaflets and flora parts.

Importance to Wildlife, Birds and Livestock
Skunktop, Pediomelum mephiticum has attractive flowers, the flowers and their seeds may be visited by hummingbirds and/or small mammals including rodents and granivorous birds in search of nectar or food.

Beneficial Value to Butterflies, Honey Bees and Insects
Skunktop, Pediomelum mephiticum has attractive flowers, the flowers and their plants may be visited by butterflies, moths, flies, honeybees, Native Bees and other insects in search of food and nectar.

Etymology:
The genus “Pediomelum” (Pedio'melum:) is from the Greek for "plain apple." The genus Pediomelum was published by Per Axel Rydberg in 1919.

The genus Pediomelum was published in in 1919 by Per Axel Rydberg, (1860-1931).

The species epithet mephiticum (mephit'icum:) from the Latin mephitis, meaning "bad odor," the common name of this taxon being 'Skunktop'.

Date Profile Completed: 09/05/2015, updated 02/22/2022
References and additional information:
Arizona Flora, Kearney, Thomas H., Peebles, Robert H., 1960, University of California Press, Berkley and Los Angeles, California, as Psoralea mephitica, botanical description.
Plants.USDA.gov; Department of Agriculture, Natural Resources Conservation Service on-line database and USGS ITIS search; accessed on-line; 02/22/2022.
https://plants.usda.gov/home/plantProfile?symbol=PEME8
https://plants.usda.gov/home/basicSearchResults?resultId=9e3b1644-1bc9-4176-ae5b-74d453327c46
World Flora Online; A Project of the World Flora Online Consortium; An Online Flora of All Known Plants - (accessed on-line; 02/22/2022)
http://www.worldfloraonline.org/search?query=pediomelum
Wikipedia contributors. "Pediomelum." Wikipedia, The Free Encyclopedia. Wikipedia, The Free Encyclopedia, 3 Dec. 2021. Web. 22 Feb. 2022.
Michael J. Plagens; Arizonensis; Field Guide; Sonoran Desert Flora; Skunktop, Indian Breadroot, Pediomelum mephiticum; accessed 02/22/2022.
http://www.arizonensis.org/sonoran/fieldguide/plantae/pediomelum_mephiticum.html
Seiler, John, Peterson, John, North American species range map courtesy of Virginia Tech, Dept. of Forest Resources & Environmental Conservation
http://dendro.cnre.vt.edu/dendrology/
Etymology: Michael L. Charters California Plant Names: Latin and Greek Meanings and Derivations; A Dictionary of Botanical and Biographical Etymology - (accessed on-line; 02/22/2022)
http://www.calflora.net/botanicalnames/pagePA-PH.html
http://www.calflora.net/botanicalnames/pageMA-ME.html
IPNI (2020). International Plant Names Index. Published on the Internet http://www.ipni.org, The Royal Botanic Gardens, Kew, Harvard University Herbaria & Libraries and Australian National Botanic Gardens. [Retrieved on-line; 22 February 2022].
https://www.ipni.org/?q=pediomelum