Dendrobium

Native: a huge genus of orchids that contains about 1,200 species; occurs in diverse habitats throughout much of south, east and southeast Asia, including the Philippines, Borneo, Australia, New Guinea, Solomon Islands and New Zealand
Type: epiphytic or occasionally lithophytic
Size: a variety of sizes
Flowering: grows quickly throughout summer, but takes a rest during winter; dormant buds erupt into shoots from the base of the pseudobulb mainly in spring, and a few species in autumn; deciduous species carry their leaves for one to two years then typically flower on leafless canes, while canes of evergreen species usually flower in the second year and can continue to flower for a number of years
Colors: many come in pinks, purples, yellows, whites, oranges, and reds
Flowering stem: axillary; the inflorescence varies in length from insignificant to 1m long, and can carry from a few (1-4) to as many as 100 flowers
Growth pattern: sympodial
Pseudobulb: varies in length from under a centimeter to several meters long, resembling canes
Roots: thick roots which are covered in a spongy white velamen and have only a thin core of vascular tissue
Known for: beautiful flowers in a rainbow of colors; many species are fragrant; name is from Greek dendron ("tree") and bios ("life") which means "one who lives on trees"; Common name is Cane Orchid because its pseudobulbs look like canes.
History: established by Olof Swartz in 1799
   
Dendrobium

The flowers comprise three sepals, two free petals and a three-lobed lip or labellum which is hinged at the base of the column.

The two sepals on either side of the labellum unite with each other to form a structure called a mentum. "Mentum" means "chin," and it does indeed jut downward from the bottom of the flower like a chin. This structure is a distinguishing characteristic of the genus Dendrobium.