recurve

So again in 747 and 748 the recurve appears primarily as a highlight; is that correct?

And the actual highlight showing the curve and recurve still appears as point D?

The outer petals recurve, as the flower develops, until they meet at the stem, thus giving us a ball-like blossom.

It must be free of any appendages abutting upon the outside of the recurve at a right angle.

A sufficient recurve may be defined as that part of a recurving ridge between the shoulders of a loop.