This section is from the book "Handbook Of Hardy Trees, Shrubs, And Herbaceous Plants", by W. Botting Hemsley. Also available from Amazon: Handbook of hardy trees, shrubs, and herbaceous plants.
This is a considerable order of herbs and shrubs with usually very gorgeous and brilliant flowers, including the genera Gloxinia, Achimenes, AEschynanthus, and Gesnera, of our stoves; but there is only one hardy species in our gardens, viz., Ramondia Pyrenaica, syn. Verbascum Myconi. The order is characterised amongst the Gramopetalous division by having unsymmetrical flowers and parietal placentation of the ovary; but the little plant alluded to is anomalous in having symmetrical flowers, and hence its position is not undisputed. It is a dwarf mountain plant about 4 inches high with tufted oblong-cordate rugose shaggy leaves and few-flowered bractless scapes. The flowers are purple or lilac with yellow anthers.