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..2 Perianth tube <2 × as long as the lobes; corolla spreading and open at the mouth
..2 Perianth tube >2 × as long as the lobes; corolla contracted at the mouth
......4 Bulb large, > 3 cm in diameter; leaves > 10 mm wide; tepals thick-textured, ± oblong, whitish or yellowish with distinct, broad, green to brown longitudinal band on adaxial surface associated with 3–5 medially aggregated veins
......4 Bulb to 3.5 cm in diameter; leaves 3-10 (-15 mm) wide; tepals usually ovate or lanceolate, thick- or thin-textured, unicolored or with narrow, indistinct green or brownish keel on adaxial surface not associated with medially aggregated veins
........5 Bracts 2 subtending each flower
..........6 Tepals connate basally for more than 1/10 of their length; flowers directed upward
..........6 Tepals separate; flowers directed outward