Aelgus, sometimes known as Lesser Kingsfoil (though unrelated to proper Athelas) was a small, green, leafy fern that grew in thick patches. It was a common herb, and like athelas was originally grown and used by the Númenoreans. Shepherds and farmers considered it a nuisance and worked to uproot and burn it. The knowledge of its use had been lost in the mists of time to all but the wisest herbalists; only those familiar with the old Lore of Wilderness: knew of its beneficial effects.
- Location: Throughout Arnor.
- Effect: Aelgus was used to treat poison.
When properly prepared and eaten, it induced vomiting that cleansed the system and purged it of venom, rendering inactive any poison in the victim’s body.