Hognut or pignut can mean any of a number of unrelated plants:
* ''
Bunium bulbocastanum
''Bunium bulbocastanum'' is a plant species in the family Apiaceae.
It was once used as a root vegetable in parts of western Europe, and has been called great pignut or earthnut.
Growth
The plant is native to western Europe. It reaches about ...
'' (black cumin) or ''
Conopodium majus
''Conopodium majus'' is a perennial herbaceous flowering plant in the celery family Apiaceae. Its underground part resembles a chestnut and is sometimes eaten as a wild or cultivated root vegetable. The plant has many English names (many of them ...
'' (kippernut) of the Apiaceae
*
rushpeas, particularly ''
Hoffmannseggia glauca'' (Indian rushpea) and ''
Hoffmannseggia densiflora'', of the Fabaceae
* ''
Carya glabra
''Carya glabra'', the pignut hickory, is a common, but not abundant species of hickory in the oak-hickory forest association in the Eastern United States and Canada. Other common names are pignut, sweet pignut, coast pignut hickory, smoothbark ...
'' (pignut hickory) of the Juglandaceae
* ''
Hyptis suaveolens
''Mesosphaerum suaveolens'', synonym ''Hyptis suaveolens'', the pignut or chan, is a branching pseudocereal plant native to tropical regions of Mexico, Central, the West Indies, and South America, as well as being naturalized in tropical parts o ...
'' (chan) of the Lamiaceae
{{plant common name