• Webster's Revised Unabridged Dictionary
    • n Peppergrass (Bot) Any herb of the cruciferous genus Lepidium, especially the garden peppergrass, or garden cress, Lepidium sativum; -- called also pepperwort. All the species have a pungent flavor.
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Century Dictionary and Cyclopedia
    • n peppergrass Any plant of the genus Lepidium. The garden-peppergrass is L. sativum, used as a cress: called garden-cress, etc. The wild peppergrass is L. Virginicum. See cress and pepperwort.
    • n peppergrass The pillwort, Pilularia globulifera. See Pilularia and pillwort.
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In literature:

Lepidium lasiocarpum (peppergrass) Tr.
"Life History of the Kangaroo Rat" by Charles T. Vorhies and Walter P. Taylor
Other pretty garnishes which are easily obtained are corn salad, peppergrass, mustard, fennel, and young leaves of carrot.
"Culinary Herbs: Their Cultivation Harvesting Curing and Uses" by M. G. Kains
Cress, or Peppergrass, 341.
"The Field and Garden Vegetables of America" by Fearing Burr
Chill and serve in nests of peppergrass or lettuce heart leaves.
"Fifty-Two Sunday Dinners" by Elizabeth O. Hiller
Did they ever have even peppergrass growin' along its edges?
"Jap Herron" by Emily Grant Hutchings
From KELLY & PIET, Baltimore: "The Spae Wife, or Queen's Secret, a story of the Times of Queen Elizabeth," by Paul Peppergrass, Esq.
"The Catholic World. Volume II; Numbers 7, 8, 9, 10, 11, 12." by E. Rameur