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.
Branching glaucescent annual herbs with yellow juice. Leaves deeply pinnatifid, usually spiny-toothed. Flowers large, white or yellow. Similar in floral characters to the Poppies, with an oblong capsule opening by valves. Six species are known, all American. The name is probably. from apyevvos, white, fair.
1. A. Mexicana. - An erect branching plant, about 2 or 3 feet high, with yellow flowers about the size of the common Poppy. The petals are very caducous. This species is a common weed in the tropics.
2. A. grandiflora (fig. 30). - A similar plant, with white flowers. Only admissible in a large garden, where its glaucous foliage and large flowers are very effective.
A. hispida is a fine white-flowering recently introduced species, larger even than A. grandiflora.
Fig. 30. Argemone grandiflora. (1/4 nat. size.)