OregonFlora: Trifolium incarnatum is native to Europe and was introduced to the United States in 1818 as a forage and green manure crop; it is commonly used as a winter grazing crop and in roadside grass plantings as a nitrogen source, especially in the southeastern states (Knight 1985). It is commonly found as a weed worldwide.
Calflora:
Information on California plants for education, research and conservation,
with data contributed by
public and private institutions and individuals.
[web application]. 2025.The Calflora Database
[a non-profit organization].Available:
https://www.calflora.org/(Accessed: 03/28/2025).
