Involute [adjective]

These names are given to the curves because the end of a stretched thread unwound from the evolute will describe the involute.

In the Balm of Gilead, the leaf is involute, rolled towards the midrib on the upper face.

The leaves are rolled towards the midrib on the upper face (involute).

Involute teeth have the advantage that they roll on one another instead of sliding.

Leaves involute, the throat usually bearded, and sheaths often enclosing the panicles.

Leaves linear, frequently involute, and the ligule or throat of the sheath bearded with long villous hairs.

Having seeds with longitudinally involute margins, as in some Umbellifer.

Involute: both edges rolled in toward the midrib on the upper side.

Involute, which is the same but the margins rolled inward, as in most of the large-flowered species of Clematis, Fig. 279.

The olivaceous cap with its peculiar involute margin and its radiating stem will greatly assist in its determination.