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Orobanche
See list of 2 species in this genus-
1a. Flowers 1–3 per plant, borne on elongate pedicels 5–25 cm long from near the ground; calyx 5-lobed, without closely subtending bracts; corolla 12–20 mm long, weakly zygomorphic, the 5 lobes subequal
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1b. Flowers more than 3 per plant (usually more than 10), arranged in a spike, sessile; calyx divided nearly to the base into 2 lateral lobes, each lobe usually bifurcate (therefore, the calyx usually 4-lobed), subtended by a bract; corolla 10–15 mm long, obviously zygomorphic
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Each photo represents one species in this genus.