. Carnegie Institution of Washington publication. 132 THE CACTACEAE. This has long remained one of our least-understood species. We believe now that it has a wide range, and that it has been referred heretofore to several species. Opuntia cymochila does not seem to differ from it, and the two published varieties of Opuntia mesacantha, geographically out of harmony with that species, doubtless belong here. Opuntia oplocarpa Engelmann (Coulter, Contr. U. S. Nat. Herb. 3: 431. 1896) was published only as a synonym. Opuntia rafinesquci greenci (Cat. Darrah Succ. Manchester 58. 1908) is a catalogue
. Carnegie Institution of Washington publication. 132 THE CACTACEAE. This has long remained one of our least-understood species. We believe now that it has a wide range, and that it has been referred heretofore to several species. Opuntia cymochila does not seem to differ from it, and the two published varieties of Opuntia mesacantha, geographically out of harmony with that species, doubtless belong here. Opuntia oplocarpa Engelmann (Coulter, Contr. U. S. Nat. Herb. 3: 431. 1896) was published only as a synonym. Opuntia rafinesquci greenci (Cat. Darrah Succ. Manchester 58. 1908) is a catalogue name. The plant is hardy at New York, flowering profusely, and also at Buck Hill Falls, eastern Pennsylvania. Illustrations: Pac. R. Rep. 4: pi. 12, f. i to 3; pi. 23, f. 10 to 12; Rev. Hort. Belg. 40: after 186, all as Opuntia cymochila; Illustr. Fl. 2:f. 2528; ed. 2. 2: f. 2987; Pac. R. Rep. 4: pi. 10, f. 3; Stand. Cycl. Hort. Bailey 4:f. 2602, in part, these as Opuntia humifusa. Pac. R. Rep. 4: pi. 8, f. 2, 3; pi. 23, f. i to 5, as 0. tortispcrma. Illustr. Fl. 2: f. 2529; ed. 2. 2: f. 2988. Plate xv, figure 4, represents a flowering and fruiting joint of a plant from Colorado, grown at the New York Botanical Garden. 125. Opuntia stenochila Engelmann, Proc. Amer. Acad. 3: 296. 1856.* Opuntia mesacantha stenocliila Coulter, Contr. U. S. Nat. Herb. 3: 430. 1896. Prostrate; joints obovate, by ; leaves small, 4 to 6 mm. long; spines usually 2, sometimes 3, spreading, i long ( to 3 cm. long), and i or 2 short and reflexed, usually light-colored, sometimes nearly white; glo- chids brown; flowers yellow, 6 cm. long; fruit very juicy, 4 to 5 cm. long or more, attenuate at base; seeds thick, quite regular, with very narrow obtuse edges. Type locality: Canyon of Zuni, New Mexico. Distribution: Western New Mexico and Arizona. This species has not been well understood. It has usually passed as a variety of the common species of the eastern Mississippi Valley Sta
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