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.
The species included under this name differ but slightly from the true Convolvuli. They are distinguished by having the stigma capitate or lobed, not divided into slender arms, and by the capsule being 3-celled. The derivation of the generic name is obscure, but it is said to come from colour,
Fig. 178. Phar bitis hispida. (1/4 nat. size.) in allusion to the variety and brilliancy of the colours of the flowers.
1. Ph. hispida, syn. Ipomaea purpurea, Convolvulus mu-tdbiUs and C. major (fig. 178). Morning Glory. - The colour of the flowers in the typical variety is a deep violet, but like its dwarf representative it has given birth to many handsome varieties, such as white, rose, carmine, or blue, or a combination of two or more of these colours. It is an annual of South American origin.
2. Ph. hederdcea, syn. P. Nil var. limbata and Ipomaa hede-rdcea. - This is a pretty dwarf annual from North America, of which there are several handsome varieties in cultivation, varying from azure-blue, blue, or violet and white to carmine and white. Leaves distant, petiolate, trilobate, acute, cordate at the base, and clothed with silky hairs on both sides.