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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. |
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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 |
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6 Perianth tube shorter than the filaments of the stamens. |
7 Stamens in 2 sets of different lengths; [ exotic, 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 |
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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; [exotics, 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. |
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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 |