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Key to Zephyranthes

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1 Perianth bright red; flowers 2-4 (-6) per scape
1 Perianth white, pink, yellow, or yellowish-orange; flowers 1 per scape.
..2 Stigma 1, capitate.
....3 Perianth white (to pinkish).
......4 Perianth 3-4.5 cm long; perianth tube 1-4 mm long, shorter than the spathe; perianth tube shorter than the filaments
......4 Perianth (7.3-) 9-14 (-16) cm long; perianth tube 70-130 mm long, longer than the spathe; perianth tube longer than the filaments.
........5 Stigma among the anthers
........5 Stigma 2 mm or more above the anthers
....3 Perianth yellow.
..........6 Perianth tube shorter than the filaments of the stamens.
............ 7 Stamens in 2 sets of different lengths; [alien, known to be naturalized in AL, FL, and MS]
............ 7 Stamens all of similar length; [native, of LA and TX]
..........6 Perianth tube longer than the filaments of the stamens.
............ ..8 Perianth tube 8-10× as long as the stamen filaments; perianth tube longer than the spathe
............ ..8 Perianth tube 1.5-5× as long as the stamen filaments; perianth tube shorter than the spathe.
............ ....9 Perianth tube ca. 2× as long as the stamen filaments
............ ....9 Perianth tube ca. 3-5× as long as the stamen filaments
..2 Stigmas 3 (trifid).
............ ......10 Stamen filaments of 4 different lengths; flowers slightly bilaterally symmetrical.
............ ........11 Perianth 6.8-8 cm long, pink; leaves to 25 mm wide
............ ........11 Perianth 2.1-3.1 cm long, yellow to orange-yellow; leaves to 6 mm wide
............ ......10 Stamen filaments of 2 lengths, or equal; flowers radially symmetrical
............ ..........12 Perianth tube 2-4 mm long; perianth 27-46 mm long; [aliens, waifs from horticultural use].
............ ............ 13 Perianth white (sometimes with a flush of pink on the lower surface); tepal series differing in orientation, the petals erect, the sepals spreading
............ ............ 13 Perianth pink; tepal series similar in orientation
............ ..........12 Perianth tube 8-40 mm long; perianth 40-110 mm long; [natives, in natural or semi-natural habitats].
............ ............ ..14 Stamen filaments 0.1-0.2 mm long; perianth tube 3-4 (-4.7) cm in length, the stigmas included
............ ............ ..14 Stamen filaments (1.5-) 1.6-4.4 (-4.7) cm long; perianth tube 0.2-3.3 (-4) cm in length, the stigmas exserted.
............ ............ ....15 Anthers 3-6 (-8) mm long.
............ ............ ......16 Style and stigma as long as or shorter than the anthers; perianth segments erect-ascending at full anthesis, (4-) 4.3-8.5 (-10) cm long
............ ............ ......16 Style and stigmas extending beyond the anthers; perianth segments spreading at full anthesis, (5.5-) 6.6-9.5 (-11) cm long.
............ ............ ........17 Mature leaves concave, 3-8 mm wide; perianth tube (0.8-) 1-2 (-2.1) cm long; filaments > 1.5× as long as the perianth tube
............ ............ ........17 Mature leaves grooved, 1-4 mm wide; perianth tube usually (1.7-) 2-3 (-3.1) cm long; filaments < 1.5× as long as the perianth tube
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