Irish crochet leaves.

Pattern includes stems and 12 identical leaves: 4 in the center and 2 on each corner of doily. Stitches include chain stitches, single crochet, half double crochet, rib stitches and 2 double crochet cluster stitches for a total of 12 rows.

Pattern 28 on page 54 in Decorative Crochet.
Pattern 12, Charmille, in 1000 Mailles.

Skill level = Advanced
Partially written pattern with a well-defined chart.