Orobanche uniflora is an annual her; a root parasite on many kinds of plants, plant without chlorophyll, main stem mostly underground, 1-3 cm long.
Leaves alternate, few, reduced to whitish scales, 0.2-0.3 cm long.
Flower white to violet with 2 yellow stripes inside, fragrant, 2 cm long, tubular, bilaterally symmetrical, curved downward, glandular-hairy outside, petal lobes 5, tips rounded, much shorter than tube, calyx 5-lobed, tips pointed; stamens 4; ovary superior; stalk 6-20 cm, finely glandular-hairy, unbranched, 1-3 per plant; solitary; blooms April-June.
Fruit a dry 2-parted capsule about 1 cm long, often capped by old petal lobes.
Wetland status: FACU.
Frequency in NYC: Very infrequent.
Habitat: Moist woods, stream-banks.
Notes: Listed as a noxious weed by the USDA and by many states (USDA, NRCS 2006).