This pattern is written with or without the column of stitches running up the center. In the images, the version without the column is shown in the Sand Dollar Sanctuary, and the version with the column is shown in Rust King Baby Llama & Mulberry Silk.

For the gauge: Knit flat, not in the round.
4.75 sts = 1” and 6 rows = 1” over stockinette st
(unwashed swatch)
4.25 sts = 1” and 6.75 rows = 1” over stockinette st (washed, lay flat to dry swatch)