Rather stout tufted plant up to 4 dm. tall. Lvs up to ± 25 cm. long, us. shorter, including sheath ± 6·5 × 1 cm., with smooth margins. Stipules stiff, almost capillary, up to 3 cm. long, pungent; petioles up to 8 cm. × 5 mm., flattened, smooth or nearly so; internodes ± 25 mm. long, midrib stout, wings narrow. Pinnae 4-10 pairs, up to 8 cm. × 2-4 mm., ascending, in one plane; margins thickened, cartilaginous. Stems of male plants 30-40 cm. long including panicle. Bract-sheaths much wider than in A. monroi, lamina pinnate. Umbels several to many, forming an open panicle ± 10 cm. diam., on rather stout short rays; umbellules small on 10-15 short rays. Stems of female plants similar to those of male, infl. c. 15 cm. long. Bract-sheaths ± 2 cm. × 5-(10) mm., rather thin; stipules very narrow, c. 1 cm. long, on short ligules; lamina with 1-2 pairs of lflts, terminal lflt up to c. 15 mm. long. Umbels rather distant; rays ± 5 cm. long. slender, us. many. Involucral bracts narrow-linear, ± 1 cm. long. Umbellules ± 1 cm. diam.; rays ∞, up to 10 mm. long. Fr ± 3-4-(5) mm. long; mericarps 3-5-winged.
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