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'Shawia arborescens × S. avicenniifolia' from the website Trees and Shrubs Online (treesandshrubsonline.
Leaves 11⁄2 to 3 in. long, 1⁄2 to 1 in. wide, tapering at both ends, dark green above, dull white tomentose beneath, margin remotely and irregularly toothed; stalk about 1⁄2 in. long. Ray-florets about seven, pure white.
A natural hybrid, also said to have arisen spontaneously in the garden of Sir John Ross at Rostrevor, Co. Down.