Orobanche corymbosa subsp. corymbosa
Plants simple, sometimes branched. Inflorescences simple corymbs or short corymbose racemes. Calyces (13–) 15–24 mm, equal to or shorter than corolla. Corollas rose, pink, or purple with darker veins, glandular-pubescent; anthers tomentose.
Phenology: Flowering Jun–Sep.
Habitat: Sandy soils and rocky slopes in open sagebrush communities and subalpine meadows.
Elevation: 100–3200 m.
Ariz., Calif., Idaho, Mont., Nev., N.Mex., Oreg., Utah, Wash., Wyo.
Subspecies corymbosa is most often mistaken for Orobanche californica with which it was formerly associated taxonomically. The two species are very similar morphologically; Orobanche corymbosa, with only two subspecies, has much less morphological variability. Except for a small area of sympatry in eastern California, the two species are otherwise allopatric.