. Carnegie Institution of Washington publication. . FIG. 120.—Opuntia campestris. FIG. 121.—Opuntia ignota. 76. Opuntia ignota sp. nov. Low, much branched, spreading; joints small, narrow, 2 to 3 cm. long, more or less purplish; leaves minute, often purplish; spines 2 to 7 from an areole, brownish, acicular, the longest ones 4 to 5 cm. long; glochids, when present, yellow; areoles large, full of grayish wool; flowers and fruit not seen. Collected by Dr. Rose on the hills below the railroad station at Pampa de Arrieros, Peru, August 23, 1914 (No. 18974). Plants grown in greenhouses
. Carnegie Institution of Washington publication. . FIG. 120.—Opuntia campestris. FIG. 121.—Opuntia ignota. 76. Opuntia ignota sp. nov. Low, much branched, spreading; joints small, narrow, 2 to 3 cm. long, more or less purplish; leaves minute, often purplish; spines 2 to 7 from an areole, brownish, acicular, the longest ones 4 to 5 cm. long; glochids, when present, yellow; areoles large, full of grayish wool; flowers and fruit not seen. Collected by Dr. Rose on the hills below the railroad station at Pampa de Arrieros, Peru, August 23, 1914 (No. 18974). Plants grown in greenhouses are dark green and develop few spines or none. This plant grows in the same region as 0. campestris, but is quite different from it. Figure 121 shows joints of the type specimen above cited. Subgenus 3. PLATYOPUNTIA. Includes all the species with flattened joints; a few species have nearly terete joints; others have some of the joints terete. Twenty-eight series are recognized. The species are most abundant in North America, but several series are found only in South America, while others have representatives in both Americas. (See Key to the Series, p. 45.). 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 Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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