New plants were created from a new and efficient method of intergeneric hybridization between the genus Argyranthemum as a female parent and a plant from I. versicolor and Glebionis sp. as a male parent. The plants were created by rescuing an embryo from the cross-pollination of a tetraploid or aneu-tetraploid Argyranthemum female parent with a plant from the group I. versicolor and Glebionis sp. as a male parent. The new plants often exhibited the perennial and multi-branched habit of the female Argyranthemum parent, with large capitula size and different ray floret colors, many not previously seen in Argyranthemum. When compared to Argyranthemum, the new plants possessed improved tolerance to high growing temperatures. In addition to providing the intergeneric hybrid plants and parts thereof, the invention provides methods for making such plants and methods for creating intergeneric hybrid plants.