From Argentina, grows as a saxicole on exposed rock or epiphytically in scrubby thorn bush, almost always forming large clusters. This caulescent species has a rigid stem and short, stiff leaves, all a dark grayish color, and bears large and very fragrant, white flowers.

A notably easy species to cultivate, tolerating a variety of conditions and light levels. Prefers to be kept bright, airy and on the dry side

The largest form, native to the desert valleys of central Ecuador. Often found growing as a saxicole or on cacti, this form differs from the typical in being much larger, with a bulbous base that can reach three inches in diameter and strictly upright, fine reddish-brown leaves. The inflorescence is longer, exceeding the foliage by several inches, branched and producing many yellow flowers which have a mild fragrance. An easy species to cultivate. Grows into a nice slightly stoloniferous cluster and does well mounted or potted in a very loose, well-drained media.