Orobanche uniflora cancer-root Orobanchaceae ORUN; Bx, pb (DeCandido 2001); Q (DeCandido 2001); R (DeCandido 2001);

  

Orobanche uniflora.Lisa Culp.www.illinoiswildflowers.info

Orobanche uniflora.Lisa Culp.www.illinoiswildflowers.info. (Accessed 4/2014).

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. 

Origin: Native. 

Habitat: Moist woods, stream-banks. 

Notes: Listed as a noxious weed by the USDA and by many states (USDA, NRCS 2006).