This section is from the book "Commercial Gardening Vol2", by John Weathers (the Editor). Also available from Amazon: Commercial Gardening, A Practical & Scientific Treatise For Market Gardeners.
A genus of pretty Poppyworts, including the Welsh Poppy (M. cambrica), 1-2 ft. high, with pale-yellow flowers; M. heterophylla, 1-1½ ft., orange yellow; M. integrifolia, 1-1½ ft., a fine biennial, with yellow flowers, from China; M. nepalensis, from the Himalayas, also has yellow flowers; while M. Wallichi from the same region, has drooping pale-blue flowers on stems 4-6 ft. high. It is a fine plant for moist shady places, and is best raised from seeds sown in spring under glass. The other kinds may be treated in the same way.