black cumin

Short definition from Wiktionary

Noun

1. 1
   A spice plant with aromatic seeds (Nigella sativa).
2. 2
   A spice plant related to cumin with dark seeds and an edible root (Bunium bulbocastanum).
3. 3
   A cultivated variety of cumin (Cuminum cyminum).
4. 4
   Elwendia persica