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1 Leaves appearing before the flowers and withering before anthesis; leaves lanceolate to elliptic (the margins not parallel for most of the length), mostly > 2 cm wide; [subgenus Rhizirideum].
2 Leaves (1.5-) 2-4 (-4.5) cm wide, without a distinct petiolarbase, the basal portion white; flowers (6-) 10-18 (-25) per umbel (fruits often fewer by abortion); spathebracts 1-2 cm long; fruiting pedicels (8-) 10-15 (-18) mm long
2 Leaves (3-) 5-8 (-9) cm wide, with a distinct petiolarbase, the petioles usually red or pink; flowers (15-) 30-55 (-63) per umbel (fruits often fewer by abortion); spathebracts 2-3 cm long; fruiting pedicels (10-) 15-25 (-30) mm long
7 Stem scapose, leafy only at its base (lowermost 1/4 or less of stem); leaves < 1.4 cm wide; [subgenus Amerallium].
11Inflorescencenodding, the peduncle bent 30-150 degrees in its uppermost several cm (at least in bud – in A. stellatum becoming erect in flower or fruit).
13Perianthcampanulate to nearly rotate, pink, pale pink, or nearly white; sepalsacute (obtuse in A. oxyphilum); [of moderate to low elevations in the Mountains, Piedmont, and Coastal Plain].
14 Plants flowering late Aug-early Oct; tepals 6-9 mm long, pale pink to nearly white; leaves moderately to strongly keeled in cross section (the angle between the two lower flat faces generally 90-135 degrees), 4-12 mm wide; [of calcareous wet savannas of the outer Coastal Plain]
14 Plants flowering Jun-early Aug; tepals 5-6.5 mm long, pink to pale pink (white to greenish white in A. oxyphilum); leaves rounded to moderately keeled in cross section (if keeled, the angle between the two lower flat faces generally 120-165 degrees), 2-8 mm wide; [of the Piedmont and Mountains].
15Pedicels relatively slender, 2-4 cm long; tepals greenish white to white; plants flowering Aug; [of barrens developed over strongly acid shales in e. WV]
15Pedicels relatively stout, 1.6-3 cm long; tepals pink or pale pink (sometimes nearly white); plants flowering Jun to early Aug; [widespread in our area, on moderately to strongly calcareous substrates]
16Tepals light pink to medium pink, the outer and inner similarly disposed, widely ascending; leaves pale green, glaucous; [in rocky woodlands, bluffs, barrens, over calcareous or mafic substrates, more widespread in our region]
16Tepals medium pink to dark pink, the outer 3 spreading, the inner 3 erect-ascending; leaves medium to dark green, not at all glaucous; [in seasonal seepage in calcareous glades, Interior Low Plateau and adjacent areas]
20 Stems 1.5-5.1 dm tall; stems 1.5-3.8 mm wide at 1 cm above the bulb; perianth white or very pale pink; capsules smaller, the seeds 1.8-2.0 and not dimpled; [of longleaf pine sandhills and other dry sandy Coastal Plain habitats and acid thin soils over granite in the eastern Piedmont from SC southwards]
20 Stems 4-8 dm tall; stems 3-7.5 mm wide above the bulb; perianth medium pink; capsules larger, the seeds 2.4-3.0 mm and somewhat rugose-dimpled; [of granite domes in the Brushy Mountains of nw. NC]