This section is from the "Embroidery Stitches" book, by M. E. Wilkinson. Amazon: Embroidery Stitches.
Veining Stitches. The stitches used for the veining of leaves may be either Stem, Split, Chain, or any other stitch which makes a good and even line.
(a)

(b)

(c)

(d)

 
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