Based on Willow Leaf, a traditional Estonian pattern. See Pitsilised Koerkirjad by Leili Reimann, page 23, or The Haapsalu Shawl* by Siiri Reimann and Aime Edasi, page 105.
*Affiliiate link. Buy the book and I get a couple pennies.
Shown with a cast-on count of 31 stitches.