It's International Clean Air Day Breathe easy with Air Purifying Houseplants! Each of these plants are verified to remove harmful toxins from the air in NASA's Clean Air Study, making them Philodendron Orange Princess in 4 Round Pot Kens Philodendrons Online Plant Guide Nicotiana sylvestris Flowering Tobacco 12 easy to grow plants that naturally enrich your garden soil fertility Times of India Culture of Mexico. The Pericon flower. The Pericn flower (Mexican Marigold) is very similar to the cempasuchil flower due to its color and aroma. It is a species native to Mexico and Guatemala. This Oenothera speciosa (Evening Primrose)