PACHYPHYLLUM (from pachys, thick, and phyllon, a leaf; referring to the consistence of the leaves.) ORD. Orchideae. A small genus of about six or seven species of stove, epiphytal orchids, natives of the Andes of South America. Flowers inconspicuous, bifariously disposed on short, axillary, few-flowered spikes, rarely reduced to one flower; the conniving perianth with a free, undivided, sessile lip, having a single tubercle at its base, and two at its apex, a petaloid column, and two pollen masses. Leaves thick and fleshy, arranged in two ranks, and overlapping each other. For culture, see Maxillaria. The two species introduced--P. distichum and P. procumbens--are of botanical interest only.