. The Cactaceae : descriptions and illustrations of plants of the cactus family. 2l6 THE CACTACEAE. Subtribe 5. CACTANAE. One-jointed plants, usually stout, globose to oblong, either solitary or cespitose, terrestrial; ribs usually straight, their areoles nearly or always spine-bearing; the flower-bearing areoles form- ing a terminal eephalium composed of a central woody core surrounded by a dense mass of long wool, bristles or both, often elongated; flowers regular, salverform or funnelform, opening in the afternoon or at night; fruit a small naked berry; seeds small. We recognize two genera,
. The Cactaceae : descriptions and illustrations of plants of the cactus family. 2l6 THE CACTACEAE. Subtribe 5. CACTANAE. One-jointed plants, usually stout, globose to oblong, either solitary or cespitose, terrestrial; ribs usually straight, their areoles nearly or always spine-bearing; the flower-bearing areoles form- ing a terminal eephalium composed of a central woody core surrounded by a dense mass of long wool, bristles or both, often elongated; flowers regular, salverform or funnelform, opening in the afternoon or at night; fruit a small naked berry; seeds small. We recognize two genera, which are not very closely related. Key to Genera. Flowers large, white or rose, night-blooming, the limb of many segments i. Discocaclus Flowers small, rose or pinkish, opening in the late afternoon, the limb of few or several segments. 2. Cactus 1. DISCOCACTUS Pfeiffer, Allg. Gartenz. 5: 241. 1837. Plants rather small, globose or flattened, ribbed; ribs rather low, tubercled; spines borne at the areoles in clusters, more or less curved; flowers from the center of the plant, appearing from a eepha- lium similar to, but usually not so prominent as, that of Cactus (Melocactus); flowers rather large for the plants, opening at night, with a definite tube, the limb broad, composed of many segments, usually white or pinkish; fruit small, naked; seeds black, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Britton, Nathaniel Lord, 1859-1934; Rose, J. N. (Joseph Nelson), 1862-1928. Washington : Carnegie Institution of Washington
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