. The Cactaceae : descriptions and illustrations of plants of the cactus family. . Fig. 58.—Phellosperma tetrancistra. l''i<;. 59.—Dolichothele longimamma. Mammillaria camptotricha Dams (Gartenwelt 10: 14. 1905) is usually considered as a close relative of this group, but it differs widely from it in the flowers as well as in other ways, and we believe that it is not congeneric with it (see page 126). Three species, natives of southern Texas and northern and central Mexico, are recognized. Key to Species. Spines glabrous, even when very young; species of Texas and northern Mexico i. D. spha
. The Cactaceae : descriptions and illustrations of plants of the cactus family. . Fig. 58.—Phellosperma tetrancistra. l''i<;. 59.—Dolichothele longimamma. Mammillaria camptotricha Dams (Gartenwelt 10: 14. 1905) is usually considered as a close relative of this group, but it differs widely from it in the flowers as well as in other ways, and we believe that it is not congeneric with it (see page 126). Three species, natives of southern Texas and northern and central Mexico, are recognized. Key to Species. Spines glabrous, even when very young; species of Texas and northern Mexico i. D. sphaerica Spines puberulent; species of central Mexico. Tubercles very long (sometimes 5 cm. long), pale green, glaucous; radials 6 or more; central spines usually present 2. D. longimamma Tubercles much shorter, bright green; radial spines 4 or 5; central spines none 3. D. uberiformis 1. Dolichothele sphaerica (Dietrich). Mammillaria sphaerica Dietrich in Poselger, Allg. Gartenz. 21: 94. 1853. Cactus sphaericus Kuntze, Rev. Gen. PI. i: 261. 1891. Mammillaria longimamma sphaerica K. Brandegee, Cycl. Amer. Hort. Bailey 2: 975. 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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