A spice plant with aromatic black seeds, Nigella sativa
Bunium bulbocastanum (black cumin) of the Apiaceae.
Conopodium majus, a tuberous plant of the Apiaceae.
Certain rushpeas, particularly Hoffmannseggia glauca (syn. Hoffmannseggia densiflora) Indian rushpea, of the Fabaceae.
The pignut or hickory (Carya glabra of family Juglandaceae).
Hyptis suaveolens of the Lamiaceae.