"The stem is cylindrical, densely leafy with fleshy, belt-shaped or roll-shaped, leathery, double-rowed leaves. The plants have powerful aerial roots of gray-green color. Inflorescences are erect or oblique, axillary, racemose, loose, few or many-flowered. The flowers are small to large, often brightly colored and variegated, sometimes fragrant. Plants are thermophilic (require a temperature of 22-25), very light-loving, demanding air humidity (70-90 %)."