Deciduous gcophyte. Root single, slightly fleshy, severed distally, remains of previous root sometimes persisting. Leaves in basal rosette, absent at flowering, 40-90 x 20-100 mm, 2-or 3-pinnate; rachis and petioles pilose. Ultimate leaflets ovate, 15-25 mm x 5-15 mm, concolorous, margins broadly lacerate, venation reticulate, pilose along margins and veins. Inflorescence 0.1-0.2 m long, with terminal umbel and 0 or 1(3) smaller, lateral umbels, greyish-black, peduncle pilose. Umbels compound; primary umbel flat-topped, involucral bracts 4 to 6, ovate, acuminate, glabrous to slightly pilose; rays 4 to 11, pilose, 25-50 mm long at anthesis; involucel bracteoles 4 to 6, lanceolate, acute, glabrous to slightly pilose, raylets 10 to 20, pilose, 3-4 mm long at anthesis. Flowers hermaphroditic, pentamerous; sepals small, cuspidate; petals white, ovate to narrowly obovate, acuminate with tips inflexed, septum present on inner face, glabrous; stamens with anthers inflexed; ovary isodiametric, oblong, 3.0-4.0 mm x ±2.0 mm; mericarps homomorphic, glabrous; median, lateral and marginal ribs 5, equal, prominent; commissural vittae 2; vallecular vittae 4; commissure narrow; carpophore bipartite; druse crystals present, scattered throughout mesocarp. A. calcicola, which flowers in autumn and early winter (April-May).
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Perennial to 25 cm, root single (or 2, with dry remnant of previous root), slightly fleshy. Leaves completely absent at flowering, pinnately divided, < 10 cm long, sparsely hairy, segments triangular, acute. Inflorescence sparsely hairy, greyish black. Flowers white. Fruit 3-4 mm long, oblong, mericarps isodiametric, ribbed, homomorphic, vittae present, rib oil ducts inconspicuous.
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