Dendrobium Orchid-Most popular orchid. Hangs out of the vase typically. Comes in white, purple, and purple/white, and greenish yellow. Cheapest orchid.
Cymbidium Orchid-Largest of the orchid family. Hard to find and typically sold as a plant. Colors are green, pink, and purples. The most expensive orchid.
Oncidium Orchid-Yellow orchid about 18 inches long. Usually sold as a cut flower and rarely as a plant.
Phalaenopsis Orchid-Typcially sold as a plant and not cut. Large papery blooms high on a stem.