They are known commonly as Aglaonema. Aglaonema is a genus of flowering plants in the arum family, Araceae. They are native to tropical and subtropical regions of Asia and New Guinea.
Chinese evergreen plants will thrive in low to bright, indirect light. Different varieties have slightly different light needs, however, and in general, the darker the leaves and stalk, the more tolerant the plant is of low light. For all varieties, avoid full sun, which can scorch the leaves.
Plant in well-draining soil in a pot with drainage holes. Water well, then let the top two inches of soil dry out before watering again. In dimmer lighting conditions, let the soil dry out more before watering again.
Chinese evergreen plants prefer standard room temperatures between 65º and 80º F (18º and 27º C), but the biggest pitfall to avoid is temperatures below 60º F (15º C).