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Herbs annual, with a long tap root. Leaves sessile or subsessile, lanceolate to oblong-lanceolate, 5--30 X 1.5--5 mm, tapering toward base, abaxially glabrescent, adaxially pulverulous, margin remotely denticulate on distal 1/2, apex obtuse to acute. Scapes 1 to many, erect, 1--25 cm, with short branched hairs; umbels many flowered; bracts subulate, 2--3 mm. Pedicels unequal, 1--1.7 cm, elongating after anthesis, 2--6(--10) cm in fruit, short glandular pubescent. Calyx turbinate, ca. 2.5 mm, parted to 1/3; lobes darker than tube, narrowly triangular, apex acute; veins 5, distinct. Corolla white; tube shorter than calyx; lobes oblong, 1--1.2 X 0.6--1 mm. 2n = 20.
Lvs oblanceolate, 1–3 cm, toothed or entire, sparsely to densely hairy with simple or forked hairs; scapes usually many, to 10+ cm, usually ± densely hairy with fine, branched hairs; umbels 3–25-fld, the bracts lanceolate or subulate, 1–3 mm, at least 4 times as long as wide; cal 2.5–4 mm, strongly carinate, the tube evidently longer than the ± deltoid lobes; cor white, the tube shortly exsert, the limb 3–4 mm wide; 2n=20. Circumboreal and polymorphic, extending s. to Que., Minn., and Ariz. May, June. (A. puberulenta)
