Hognut or pignut can mean any of a number of unrelated plants:
- Bunium bulbocastanum (black cumin) or Conopodium majus (kippernut) of the Apiaceae
- rushpeas, particularly Hoffmannseggia glauca (Indian rushpea) and Hoffmannseggia densiflora, of the Fabaceae
- Carya glabra (pignut hickory) of the Juglandaceae
- Hyptis suaveolens (chan) of the Lamiaceae
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