Sometimes the pattern is hard to see. I usually look at a corner---the top corners here.
And then we can see that it's English Ivy, BlockBase # 1330
Easier to see in this mid-20th century version
Eveline Foland drew a pattern for the Kansas City Star in 1931
BlockBase shows several variations with different shading
and more or less half-square triangles.
Broken Branch from the Star in 1935
The pattern is older than the newspaper articles.
Above and below: Mid-19th century
Late 19th century or is this Marilyn Mowry's repro?
Marilyn Mowry, Carolina Lily from the book History Repeated
Annette Plog designed this repro for the Lone Star House of Quilts.
She calls it a Carolina Lily----a relative of English Ivy in the quilt world if not the plant world.
WPA Watercolor of an English Ivy quilt by Norma Lockwood