1	"Herbs lacking chlorophyll, stems brownish or yellowish; leaves reduces to scales or absent"	Orobanche
1	"Chlorophyllous plants with leaves, and at least young stems, green"	2
2	"Leaves alternate, at least in the upper parts"	3
2	"Leaves opposite or whorled"	4
3	"Stems erect, with long, white hairs; flowers in dense spike; corolla 10–30 mm long; seeds deeply reticulate, or with loose-fitting reticulate testa"	Castilleja
3	"Stems slender, procumbent, with minute hairs; flowers in loose spike; corolla 6–12 mm long; seeds shallowly reticulate"	"Triphysaria {Triphysaria pusilla}"
4	"Upper corolla-lobes recurved; awns of rearmost pair of anthers longer than the other 6 awns; seeds longitudinally ribbed, trabeculate"	Euphrasia
4	"Upper corolla-lobes projected forwards; awns of anthers equal; seeds smooth, finely reticulate or ribbed"	Bellardia