Alternating Leaf/Leaves Lace Stitch.
Video tutorial on how to knit Alternating Leaf Lace stitch

Knitted in a multiple of 9, + 3 sts and a 12-row repeat
Row 1 - right side: Knit.
Row 2: Purl.
Row 3: K3, * k2tog, k1, yo, k6; rep from * to end.
Row 4: P1, * p6, yo, p1, p2tog; rep from * to last 2 sts, p2.
Row 5: K1, * k2tog, k1, yo, k6; rep from * to last 2 sts, k2.
Row 6: P3, * p6, yo, p1, p2tog; rep from * to end.
Row 7: Knit.
Row 8: Purl.
Row 9: * K6, yo, k1, ssk; rep from * to last 3 sts, k3
Row 10: P2, * Ssp, p1, yo, p6; rep from * to last st, p1.
Row 11: K2, * k6, yo, k1, ssk; rep from * to last st, k1.
Row 12: * Ssp, p1, yo, p6; rep from * to last 3 sts, p3.

Knitting abbreviations:
K: Knit | P: Purl | Yo: Yarn over  | Ssk: Slip slip knit | Ssp: Slip slip purl.