The Unusual Forms, still called the Exotic Forms by many of us who have worked with and collected these exotically shaped daylilies for many years, are officially categorised by the American Hemerocallis Society:
UNUSUAL FORMS DEFINITION:
I. The Unusual Form Class is based exclusively on form, not on colour, or colour patterns. The flower must have distinctive petal, sepal or a combination of both petal and sepal shapes. These include:
A. CRISPATE
1. Pinching - Floral segments with sharp folds giving a pinched or folded effect.
2. Twisting - Floral segments which present a corkscrew or pin-wheel effect.
3. Quilling - Floral segments turn upon themselves along their length to form a tubular shape.
 
B. CASCADE
1. Cascading/Curling ­ Narrow floral segments with pronounced curling or cascading, which revolve upon themselves in the manner of a wood shaving.
C. SPATULATE
1. Spatulate - Floral segments markedly wider at the end like a kitchen spatula.
II. No cultivar whose measurements meet the definition of a Spider or Spider Variant, is on the official AHS Spider and Spider Variant List, or has won the Harris Olson Spider Award is eligible.

Under the category of CRISPATAS I have noted the following specific combinations of expressions of crispation:
The BUTTERFLY Crispata is a spatulate base form with consistent sepal (and preferably also petal) base quilling.
The COCKEREL Crispata has consistent quilled sepals and normally formed, flat petals.
The BAROQUE Crispata has consistent twisting of all tepals.
The PINWHEEL Crispata has consistent folded tepal tips.
The PINCHED AND CURLED Crispata has consistent recurved sepals and pinched petal tips.
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