Called 'mosaic patchwork', English quiltmakers had been working with the hexagon since the mid-19th century. Perhaps inspired by beautiful marquetry boxes and tiles from the Middle East, English quilters cut hexagonal shapes from paper, basted a fragment of fabric over the hexagon and when enough patches were made, whip-stitched the patches together from the front of the work in rings of six patches around a center hexagon. The comparison to a flower--petals around a center- was inevitable.
Once when at a flea market, I spied what I thought was an average Grandmother's Flower Garden quilt in the pile and pulled the quilt out to examine. However this was far more than a common 1930s GFG--it was a late19th century English-sewn mosaic quilt and now it lives with me.
The last picture shows that the patches were whip-stitched together from the front plus the edges of the quilt were knife-edged. That means the layers folded in towards each and sewn together.