Orobanches Gen. Diask., 78. 1825.
Stems 6–20 cm. Leaves triangular to broadly lanceolate, 5.5–18 × 5–12 mm, glabrous or minutely hairy along margins. Bracts mostly concealing calyces, lanceolate, 5–18 × 2–8 mm, margins entire or minutely erose, not ciliate, glabrous, veins visible or obscure. Pedicels 0–4(–6) mm; bracteoles 2. Flowers: calyx 3–8 mm, lobe margins entire or erose, not ciliate, apex acute; corolla 8–14 mm; anthers glabrous. Capsules 5–15 × 5–12 mm; styles persistent.
Phenology: Flowering Feb–Jun.
Habitat: Under oaks in moist deciduous or mixed deciduous-coniferous woods.
Elevation: 30–600 m.
Man., N.S., Ont., Que., Ala., Conn., Del., D.C., Fla., Ga., Ill., Ind., Ky., Maine, Md., Mass., Mich., N.H., N.J., N.Y., N.C., Ohio, Pa., R.I., S.C., Tenn., Vt., Va., W.Va., Wis., s Mexico.
A. G. Rodrigues et al. (2013) noted the existence of a single historical specimen from Jeff Davis County, Texas, and suggested that this represented a historical disjunction. However, it is also possible that the specimen in question was mislabeled.
V. Baird and J. L. Riopel (1986) documented the dispersal of Conopholis americana in the eastern United States by deer and rodents.