Primula mollis (Primulaceae).—A non-dimorphic species, self-fertile: J. Scott, in ‘Journal of the Linnean Society Botany’ volume 8 1864 page 120.
Nolana prostrata (Nolanaceae).—Plants covered up in the greenhouse, yielded seeds by weight compared with uncovered plants, the flowers of which were visited by many bees, in the ratio of 100 to 61.
Ajuga reptans (Labiatae).—Set a good many seeds; but none of the stems under a net produced so many as several uncovered stems growing closely by.
Euphrasia officinalis (Scrophulariaceae).—Covered-up plants produced plenty of seed; whether less than the exposed plants I cannot say. I saw two small Dipterous insects (Dolichopos nigripennis and Empis chioptera) repeatedly sucking the flowers; as they crawled into them, they rubbed against the bristles which project from the anthers, and became dusted with pollen.
Veronica agrestis (Scrophulariaceae).—Covered-up plants produced an abundance of seeds. I do not know whether any insects visit the flowers; but I have observed Syrphidae repeatedly covered with pollen visiting the flowers of V. hederaefolia and chamoedrys.
Mimulus luteus (Scrophulariaceae).—Highly self-fertile.
Calceolaria (greenhouse variety) (Scrophulariaceae).—Highly self-fertile.
Verbascum thapsus (Scrophulariaceae).—Highly self-fertile.
Verbascum lychnitis.—Highly self-fertile.
Vandellia nummularifolia (Scrophulariaceae).—Perfect flowers produce a good many capsules.