Next to the royalty on the orchid tree is a close relative, Miltassia 'Charles M. Fitch'. This plant is the result of crossing two different genera, Brassia and Miltonia. Orchid enthusiasts, beginning in the early twentieth century, pioneered the hybridization of different genera and the embryo rescue and tissue culture techniques often necessary to obtain living offspring.

The orchid family, Orchidaceae, is the second largest plant family in the world, with 880 genera and more than 26,000 species. Orchid breeders have created more than 100,000 hybrids, some of them combining the characteristics of more than five different genera, producing a range of flower sizes, shapes, colors, and fragrances.

The orchid family consists of a large number of genera, each with its own unique characteristics. A common characteristic, however, is the basic form of the flower, which consists of three petals surrounded by three sepals—often in dramatic and contrasting colors and in a variety of shapes and sizes. Although some orchids are native to temperate zones, most orchids tend to prefer a semitropical or tropical environment (USDA Zones 9-11) and have epiphytic roots,  meaning they derive moisture and nutrients from the air and support from another plant; few orchids grow in soil. Orchids usually prefer a diurnal temperature fluctuation—meaning warmer days and cooler nights—though the absolute temperature range (cool, intermediate or warm) varies by genus and is consistent with their natural habitat. While requiring adequate sunlight for a stunning bloom display, most orchids will not tolerate sustained direct sun.

Many varieties have pseudobulbs, a portion of the stem between leaf nodes that stores water to help sustain the plant through dry periods. Other varieties are monopodial, meaning upward growth is from a single growing point.

There is an exception to almost every general statement one can make about orchids. The family continues to challenge taxonomists.