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In Gesneria the several parts of the flower are arranged on nearly the same plan as in Digitalis, and most or all of the species are dichogamous.

Thus, the crossed and self-fertilised flowers on the parent-plants of Ipomoea, Gesneria, Salvia, Limnanthes, Lobelia fulgens, and Nolana produced a nearly equal number of seeds, yet the plants raised from the crossed seeds exceeded considerably in height those raised from the self-fertilised seeds.

Gesneria pendulina:   8 : 32.06 : 8 : 29.14 : 90.

Mimulus luteus; height, vigour, and fertility of the crossed and self-fertilised plants of the first four generations.—Appearance of a new, tall, and highly self-fertile variety.—Offspring from a cross between self-fertilised plants.—Effects of a cross with a fresh stock.—Effects of crossing flowers on the same plant.—Summary on Mimulus luteus.—Digitalis purpurea, superiority of the crossed plants.—Effects of crossing flowers on the same plant.—Calceolaria.—Linaria vulgaris.—Verbascum thapsus.—Vandellia nummularifolia.—Cleistogene flowers.—Gesneria pendulina.—Salvia coccinea.—Origanum vulgare, great increase of the crossed plants by stolons.—Thunbergia alata.

The stigma of Gesneria pendulina sometimes protrudes far beyond, and is sometimes seated beneath the anthers; so it is with Oxalis acetosella and various other plants.