Single Daylilies

 The shape or structure of a daylily flower. The AHS officially recognizes the following forms for registration and exhibition purposes: single, double, spider, unusual form, and polymerous flowers.

Single -- Daylily flowers that have three petals, three sepals, six stamens and one pistil(comprised of three carpels) are known as "single" daylilies. A single daylily flower may occasionally have fewer or more (see "polymerous") parts per whorl. Also see "monocot", "double".   (source: American Hemerocallis Society)