Shrubs to 25 dm, . Leaves sessile; blade 3-veined from base, elliptic, lanceolate-elliptic, lanceolate-linear, or oblong, 40–80(–120) × 6–25 mm. Inflorescences solitary flowers. Flowers: sepals 3, ; petals white, sometimes with red or yellow spot near bases, 30–50 mm; styles 0–0.5 mm. Capsules 6–12-locular. 2n = 18 (Europe).
'Flora of North America @ eFloras (2008). Published on the Internet http://www.efloras.org/flora_page.aspx?flora_id=1 [accessed August 2016]' Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.