Corona cylindrical, enclosing numerous segments; Perianth segments ovate, inflexed, twisted or with margins wavy or recurved, overlapping at base only; corona cylindrical, broad, white or very pale greenish yellow, with mouth lobed, rim flanged and crenate; the corona enclosing numerous segments of more or less the same length and color, some blunt and some acute; the corona sometimes split to base, with the segments more or less spreading.

A description according to Daffodils, narcissus, and how to grow them as a hardy plants for cut… 1907 by Arthur Martin Kirby, when known as ‘Double White Trumpet’ “This, we believe, is the only double form of an all white trumpet daffodil now purchasable, and even it is very rare. Botanically it is known as N. cernuus plenus being the double of the ‘White Swan’s Neck’ trumpet cernuus. The flowers are of exquisite beauty – cream-white, it resents manure.”

'Cernuus Flore Elegantissime Pleno', 'Plenus' Pseudonarcissus 'Cernuus Plenus'', 'Plenus##', 'The Double White Trumpet', 'The Double White Trumpet Daffodil', 'The Old English Double White Daffodil'