Slickspot peppergrass (Lepidium papilliferum)
Slickspot peppergrass is a tap-rooted, intricately-branched plant. The plant flowers once and then dies (it is monocarpic), and displays two different life cycles, an annual and a biennial form. The plant averages 2 to 8 inches, but can reach up to 16 inches in height. Leaves and stems are covered with fine, soft hairs, and the leaves are divided into linear segments. Flowers are numerous, 0.1 inches diameter, white, and 4-petalled. Fruits (siliques) are 0.1 inches, round in outline, flattened, and 2-seeded. The annual form of the Slickspot peppergrass matures, reproduces by setting seed, and dies in one growing season. The biennial life form initiates growth in the first year as a rosette, but does not produce seed and die until the second year. Biennial rosettes must survive dry summers on the Idaho Snake River Plain and Owyhee Plateau, and consequently many of these rosettes die before flowering and producing seed. The proportion of annuals versus biennials in a population can vary greatly.
- States/US Territories in which the Slickspot peppergrass, is known to or is believed to occur: Idaho
- US Counties in which the Slickspot peppergrass, is known to or is believed to occur: View All
|Status||Date Listed||Lead Region||Where Listed|
|09/16/2016||Pacific Region (Region 1)|
» Candidate Information
» Federal Register Documents
» Conservation Plans
|CCA Plan Summaries|
|3 Hulls Gulch Reserve Plants (ID): Aase's onion, Mulford's milk-vetch, Slick-spot peppergrass|
|Boise Airport Slick Spot Peppergrass CCA|
|Slick Spot Peppergrass|
» Life History
No Life History information has been entered into this system for this species.
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