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1 Stems and leaf blades hirsute to glabrate or glabrous; leaf blades spatulate; flowers bilaterally symmetrical, 10-13 mm long; corollas white with scattered purple spots inside, tubular-funnelform, villous inside; stamens 4 (-5), didynamous; styles included; [s. FL] | |
1 Stems and leaf blades glabrous; leaf blades lanceolate; flowers radially symmetrical, 8-10 mm long; corollas white, rotate, glabrous; stamens 5, equal; styles exserted; [s. TX] |