Flower buds of Viscaria candida, excised at 1–2 mm in length, have been grown to maturity in sterile culture, often producing normal flower parts. The calyx and the corolla developed under a wide range of conditions provided gibberellic acid was present. The development of the ovary and of the ovules tended to be irregular and no consistent effects of treatment could be obtained. Pollen production was promoted by a temperature of 15 °C as opposed to one of 25 °C, and by the addition of gibberellic acid to the medium; it was inhibited by the addition of kinetin or hydrolysed casein to the medium, and by growth in continuous darkness as compared with that in 8 or 16 h of light daily.