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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.

Corolla.—Deep sulphur-yellow; the slender falcate upper lip dark purple; the tube very slender, but the sacs of the lower lip large and deep, their folds hairy within.

Fins of H. g. gracilis are more strongly falcate than those of the other subspecies.

The adult butterfly is remarkable for the falcate shape of the outer margin of each front wing and the broad tail at the hind outer angle of each hind wing.

The sei whale's smaller size and decidedly taller, more falcate dorsal fin located well more than one-third forward from the tail should prevent confusion with the blue whale.