Spathiphyllum

One of the most popular and forgiving foliage houseplants - an evergreen tropical perennial grown indoors for its glossy, dark-green, lance-shaped leaves and elegant white "flowers." Those flowers are not true showy blooms but a white leafy hood, the spathe, wrapped around a creamy spadix. POWO (Kew) places Spathiphyllum wallisii native to the tropical rainforests of Colombia and Venezuela; it is now grown worldwide as an indoor foliage plant. Honesty matters here. It is famously easy: it tolerates LOW light and conveniently droops when thirsty, then recovers after a watering. But every part contains insoluble calcium-oxalate crystals and is TOXIC to cats, dogs, and people if chewed, so keep it away from pets and small children. And its celebrated "air-purifying" reputation, from a 1989 NASA chamber study, is OVERSTATED - at realistic room densities the effect on indoor air quality is negligible. Grow it for its looks and easy care, not as an air purifier. RHS rates it frost-tender, H1B, a tender evergreen for shade and indoor culture under glass.

Snowflower (also called peace lily, a name used across its genus) is a wild tropical aroid that Kew's WCVP places native to Colombia, Ecuador, Peru, and Venezuela. It is a clump-forming evergreen perennial whose oval to lance-shaped leaves are 5 to 8 inches long, at the small end of a genus whose leaves run 5 to 26 inches, and its spathe is greenish- or yellowish-white rather than pure white, 4 to 8 inches long around the flowering spadix. Many peace lilies in the houseplant trade are cultivars and hybrids, so a plant sold simply as a peace lily is not necessarily this species. Like the rest of its genus it contains calcium-oxalate crystals, a genus-level finding that makes it mildly toxic to people and pets if chewed, and it is frost-tender: hardy outdoors only in frost-free USDA zones 11-12 and grown as a houseplant everywhere else.