1	"Lip entire, stripes 3--5, +- red to +- purple, faint or not, mentum 0; lower sepals curved forward"	"Corallorhiza striata"
1	"Lip with 2 lobes laterally, stripes 0, mentum at base; lower sepals spreading or curved forward"	2
2	"Sepal veins 1; lower sepals curved forward"	"Corallorhiza trifida"
2	"Sepal veins 3; lower sepals spreading"	3
3	"Lateral lobes of lip acute, prominent or not"	"Corallorhiza mertensiana"
3	"Lateral lobes of lip rounded, prominent"	4
4	"Lip +- not widening to tip"	"Corallorhiza maculata var. maculata"
4	"Lip widening to tip"	"Corallorhiza maculata var. occidentalis"