Small to medium-sized herbs; base irregular, 0.5-2.0 cm. long, 2-8 mm. wide, 1-2 mm. thick. Leaves 2-3 times pinnate, with all the pinnae ascending at an angle of 30-450, 2-20 cm. long; primary pinnae 0.6-4.0 cm. long, 10-20 per leaf, the ultimate pinnae a few times forked; ultimate divisions to 1 mm. long and about 0.5 mm. wide, ovate, obtuse to acute, slightly nerved or nerveless, or the ultimate divisions rotundate and margins crenulate to lobed; petiole terete to flattened, 0.5-5.0 cm. long, 0.5-2.0 mm. wide at the base, the rachis distinctly striate and narrowly winged. Flowers few, solitary; pedicel terete, 0.5-5.0 cm. long; young spathe clavate, acute, 2-5 mm. long, the older infundibuliform, 6-10 mm. long; tepals 6-8, triangular, acute, less than 0.5 mm. long; stamens 6-8, 3.0-5.5 mm. long; filaments at first subulate but later lanceolate, membranaceous, 3-sided at the base, 2.5-4.5 mm. long; anthers obtuse or mucronate, 1.0-1.5 mm. long; pollen globose, slightly 3-sulcate, 17 X 14 microns; ovary ovoid to ellipsoid, acute, base attenuate, slightly flattened, definitely 8-ribbed, 2 of the ribs indistinct, in young flowers 2.5-3.0 mm. long, 1.0-1.5 mm. wide; styles filiform or spathulate, obtuse, emarginate, slightly papillate, 1.0-1.5 mm. long. Fruit with equal valves, each distinctly 5-ribbed.
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