False-mermaid, False Mermaid, False Mermaidweed, Floerkea: Floerkea proserpinacoides (Synonym: Floerkea occidentalis) - Flowers with 3 petals or sepals. Petals about 1-2 mm long, about half the length of the sepals.
Meadow-foams: The Genus Limnanthes - Flowers with 4-5 petals or sepals. Petals 4-12 mm in length.