American Black Nightshade, Common Nightshade, Small-flowered Nightshade, White Nightshade: Solanum americanum - Native.
Douglas' Nightshade, Greenspot Nightshade: Solanum douglasii (Synonym: Solanum nigrum var. douglasii) - Native.
Horse-nettle, Silver-leaved Horsenettle: Solanum elaeagnifolium - Non-native.
Parish's Nightshade, Parish's Purple Nightshade: Solanum parishii - Native.
Cutleaf Nightshade, Three-flowered Nightshade: Solanum triflorum - Non-native.
Chaparral Nighshade, Nightshade: Solanum xanti - Native.