one-flowered wintergreen: delicate evergreen dwarf herb of north temperate regions having a solitary white terminal flower; sometimes placed in genus Pyrola
herb: a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests
methylene blue: a dark green dye used as a stain, an antiseptic, a chemical indicator, and an antidote in cyanide poisoning