This section is from "The Horticulturist, And Journal Of Rural Art And Rural Taste", by P. Barry, A. J. Downing, J. Jay Smith, Peter B. Mead, F. W. Woodward, Henry T. Williams. Also available from Amazon: Horticulturist and Journal of Rural Art and Rural Taste.
The Triguera ambrosiaca is an annual plant, with a slender, smooth stem, presenting four angles, two more striking than the others. Its alternate leaves, regularly oval and jagged, recall those of the Planera crenata; the corolla is monopeta-lou8, of a deep violet color, contrasting very prettily with the almost black hue of its tube-shaped base.
The peculiarity of the growth of the leaves is shown in the plate. The flowers close in the evening, not to open till 8 o'clock in the morning.
This plant is sensitive to cold, and the seeds should not be sown till there is no danger of frost. A light and substantial soil suits it the best. It should be exposed to the free air and sun. To have it in all its beauty, the Triguera ambrosiaca should be cultivated like the Schizanthus; sow the seeds in the autumn, and place the plants in the pots you propose keeping them in through the winter, and under frames, taking the precaution to give them as much air as possible. If you wish to hasten the flowering without sowing so early as autumn, January or February will do to plant the seeds.
The species before us is valuable for the color of its flowers, which succeed each other a long time.
The Trigueras come from the Mediterranean region, also from the neighborhood of Cordova.
Three species only have been described, - the one before us, the T. inodora, and the T. baccata.
THE TRIGUERA AMBROSIACA.