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Tentacula depressed, subulate, at the external base of which are the eyes.—Adanson.

Antenn� cylindrical, thickest near the middle, the terminal half subulate; articulations numerous, very short, hardly perceptible.

Creeping, simply pinnate; leaves concave, obtuse, decurved; lower lobe oblong-clavate, emarginate at base; underleaves oblong, flat, 2-cleft, the sinus obtuse; involucral leaves unequally 2-cleft, the dorsal segment oblong, pointed, nearly entire, the ventral subulate; perianth pyriform, 3-sided, obtusely keeled beneath.

In this species there are rudimentary subulate petals, alternate with the calyx-lobes.

Filaments distinct or nearly so on the ring at base of corolla, alternating with 5 subulate staminodia; anthers linear.