Variations 
There is 2-main sub-groups.

Grandiflora
These annuals have flowers that appear in a compact cyme with 5 to 15 blooms that are up to 80mm (3⅛ in) long. The flower colours include red, yellow, orange and in bi-colours with markings in purple.

Multiflora
These annuals produce blooms in less than 16 weeks and grow to 200 mm (7¾ in) tall. They have yellow and orange or red flowers that are arranged in a dense cyme that appears during summer and the seed may be sown throughout the year.