This is pattern #64 in the book “100 Lace Flowers to Crochet.” Instructions on page 83. Featured on page 35 of the Showcase.

Finished length: 2-1/2 inches (64 mm)
Thread required: 3 yards (2.7 m)

All pattern samples in this book are made with size 10 thread and a size 5 (1.9mm) crochet hook.