Ptyxis

Ptyxis is the way an individual leaf is rolled or folded within the bud, before it expands. Reclinate ptyxis is when the upper half of the leaf blade bends down over the lower half, as in loquat (Eriobotrya japonica). Conduplicate is when the leaf folds lengthwise along the midrib, as in guava, sweet potato and camel's foot tree (Bauhinia). Plicate (plaited) is when the leaf is folded repeatedly, lengthwise, in a zig-zag along its ribs, as in the palm Borassus flabellifer. Circinate is when the leaf rolls from its apex toward its base, like a dog's tail curling, as in ferns. Convolute is when the leaf rolls from one margin over to the other, as in banana and members of the Araceae (aroids) and Indian pennywort. Involute is when both margins roll up onto the leaf's upper surface toward the midrib, as in water lil …