chelone

from The Century Dictionary.

• noun A genus of turtles; the green turtles, such as (Chelone midas, and the hawk′ s-bill or tortoise-shell turtle, Chelone imbricata. Also written Chelonia. See cut under Chelonidœ.
• noun In botany, a small genus of scrophulariaceous perennial plants, in which the corolla is inflated, arched, and nearly closed, so as to resemble the head of a tortoise, whence the name: related to Pentstemon.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Bot.) A genus of hardy perennial flowering plants, of the order Scrophulariaceæ, natives of North America; -- called also snakehead, turtlehead, shellflower, etc.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun botany Chelone, a genus of four species of perennial herbaceous plants that are native to eastern North America.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun herbaceous perennials: shellflower