falcate

Pod flat, oblong, often falcate, few–several-seeded.—Low perennial herbs, or woody at base, punctate with black glands, with bipinnate leaves, and naked racemes of yellow flowers opposite the leaves or terminal.

From The Manual of the Botany of the Northern United States Including the District East of the Mississippi and North of North Carolina and Tennessee by Asa Gray

The dorsal fin of this species is tall and falcate, closely resembling that of the Atlantic bottlenosed dolphin, and is located near the midpoint of the back.

From Whales, Dolphins, and Porpoises of the Western North Atlantic A Guide to Their Identification by David Caldwell

They have relatively stubby snouts and dorsal fins, which are broad at the base, tall, and falcate.

From Whales, Dolphins, and Porpoises of the Western North Atlantic A Guide to Their Identification by David Caldwell

The dorsal fin is small, located behind the midpoint of the back, and variable in shape from falcate to triangular.

From Whales, Dolphins, and Porpoises of the Western North Atlantic A Guide to Their Identification by David Caldwell

Although spotters can be either relatively short-snouted and chunky or long-snouted and slightly built, the spinal blaze, flipper-to-eye stripe, white lips, and falcate dorsal fin can be used to identify them.

From Whales, Dolphins, and Porpoises of the Western North Atlantic A Guide to Their Identification by David Caldwell