Cuscuta japonica is an annual herb or vine (parasitic) that is not native to California.
There is a high risk of this plant becoming invasive in California according to Cal-IPC.
[Wikipedia] Effects on Hosts: The Japanese dodder is a plant that parasitizes other plants. From mild development issues to serious complications sometimes resulting in death, the Japanese dodder can cause a wide spectrum of effects on its plant host.[4] Farmers in particular can be affected by this plant, as infection leads to less crops they are able to harvest. (link added by Mary Ann Machi)
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: 03/30/2025).
one or more occurrences