arugula

Short definition from Wiktionary

Noun

1. 1
   A yellowish-flowered Mediterranean herb of the mustard family with flavoured leaves, often eaten in salads, that has a distinct, peppery flavor, of three species: Eruca spp., especially Eruca sativa (syn. Eruca vesicaria subsp. sativa)
2. 2
   A yellowish-flowered Mediterranean herb of the mustard family with flavoured leaves, often eaten in salads, that has a distinct, peppery flavor, of three species: Diplotaxis tenuifolia