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Lepidium papilliferum
Also called Slickspot Peppergrass
Idaho pepperweed is a rare annual or biennial herb in the cabbage family, native only to southwestern Idaho, where it grows in alkaline "slickspot" soils. It is federally listed as threatened, so it is not grown in gardens and is best appreciated in the wild.
Lepidium papilliferum is a rare species of flowering plant in the mustard family known by the common names Idaho pepperweed and slickspot peppergrass. It is endemic to Idaho in the United States, where it is mostly limited to a specific habitat type in the southwestern part of the state. It was federally listed as a threatened species in 2009.
This is an herb growing just a few centimeters to over 20 centimeters tall, and known to approach 40 centimeters. The leaves are divided into many subdivided lobes, the largest blades measuring 4 centimeters in length. The inflorescence is a raceme of many white flowers. The fruit is a rounded, flattened, winged silique up to 3 or 4 millimeters long by 3 to 4 wide. There is an annual form and a biennial form of the plant, the annual form completing its life cycle in one year and the biennial not producing flowers or seed until its second year.
African pepperwort · Waitakere Scurvy Grass · Waianae Range pepperwort · Lepidium aschersonii · Southern pepperwort · Coastal peppercress · Barneby's pepperweed · Field pepperweed · Creeping Watercress · Common pepperweed · Alkali pepperweed · Wartcress
Text excerpted from the Wikipedia article Lepidium papilliferum by its contributors, under CC BY-SA 4.0; the excerpts and the care summary drawn from them are shared under the same licence.
The care summary was written by AI (Claude, Anthropic) from the sources on this page, with general growing knowledge where they are silent. Check before relying on it.
Life form, climate and native range: World Checklist of Vascular Plants, Royal Botanic Gardens, Kew (CC BY 3.0), reformatted; see Plants of the World Online.
