Synopsis

Source of validity: Traditional
Rating (out of 5): 1

Lesser speargrass (Achnatherum hymenoides, also known as Indian ricegrass) is primarily referenced in ethnobotanical sources for its use by Indigenous peoples, particularly in North America, as a food source rather than a medicinal plant. However, there are anecdotal and traditional accounts—though limited—suggesting the use of various speargrass species in folk medicine for digestive complaints, including nausea and vomiting. These accounts are neither well-documented nor widespread; most references emphasize other uses. There is no substantial or systematic scientific research validating the efficacy or mechanism of action for Lesser speargrass in treating nausea or vomiting. The traditional evidence that does exist is sparse and not specific to this particular species, often being generalized across several grass species. Consequently, while there may be some basis in tradition, the evidence is weak and not robustly supported by detailed historical or ethnobotanical records, and there is a complete lack of modern clinical research. Therefore, the use of Lesser speargrass for nausea and vomiting is based more on limited traditional knowledge rather than scientific validation, and the overall evidence is rated as very low.

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