http://www.estabrooksonline.com/catalog2/perennials/perennial.asp?id=Primula

shows various primroses, which “have been around since Elizabethan times”.

Using an orange centre with my yellow primrose is inspired by what they call in their catalogue the “You and Me Yellow Primrose”

Normally, primroses were embroidered in yellow. This image is from from the Victoria & Albert Museum's Textile Collection: Embroidery in Britain from 1200 to 1759 (King and Levey) Figure 36

but I’ve found some embroidered variations.

This is another type of primula vulgaris (also from King and Levey):

and this one – yellow edged with red (also shown in the catalogue above as a hose-in-hose type). There looks to be gold braid (plaited braid stitch?) outlining the pods.

This image is from book The Embroidery at the Burrell Collection, Liz Burrell, page 106

(Sorry it’s not clearer – the original image is tiny)

So they can vary in colour – from purple to pink to blue to yellow – but that calyx pod is a dead give away that it’s a primrose.

One thing that crossed my mind was “I hope I’ve got the proportion of the calyx to the flower correct”. I found this nice diagram at

http://chestofbooks.com/flora-plants/flowers/Illustrated-Flora-2/I-Primula-L-Sp-Pl-142-1753.html

from the book "An Illustrated Flora Of The Northern United States, Canada And The British Possessions Vol2", by Nathaniel Lord Britton, Addison Brown.