. Carnegie Institution of Washington publication. OPUNTIA. 224. Opuntia polyacantha Haworth, Suppl. PI. Succ. 82. 1819. Cactus ferox Nuttall, Gen. PI. i: 296. 1818. Not Willdenow. 1813. Opunlia media Haworth, Suppl. PI. Succ. 82. 1819. Opuntia missouriensis De Candolle, Prodr. 3: 472. 1828. Opunlia splcndcns Pfeiffer, Enum. Cact. 159. 1837. (Ipuiitiii iiiissonriensis albispina Engelmann and Bigelow, Proc. Amcr. Acad. 3: 300. 1856. Opuntia missouriensis microsperma Engelmann and Bigelow, Proc. Amcr. Acad. 3: 300. 1856. Not 0. rafinesquei microsperma Engelmann, Proc. Amer. Acad. 3: 295. 1856. Op
. Carnegie Institution of Washington publication. OPUNTIA. 224. Opuntia polyacantha Haworth, Suppl. PI. Succ. 82. 1819. Cactus ferox Nuttall, Gen. PI. i: 296. 1818. Not Willdenow. 1813. Opunlia media Haworth, Suppl. PI. Succ. 82. 1819. Opuntia missouriensis De Candolle, Prodr. 3: 472. 1828. Opunlia splcndcns Pfeiffer, Enum. Cact. 159. 1837. (Ipuiitiii iiiissonriensis albispina Engelmann and Bigelow, Proc. Amcr. Acad. 3: 300. 1856. Opuntia missouriensis microsperma Engelmann and Bigelow, Proc. Amcr. Acad. 3: 300. 1856. Not 0. rafinesquei microsperma Engelmann, Proc. Amer. Acad. 3: 295. 1856. Opunlia missouriensis philycarpa Engelmann, Proc. Amer. Acad. 3: 300. 1856. Opuntiu missouriensis riijispina Engelmann and Bigelow, Proc. Amer. Acad. 3: 300. 1856. Opunlia missouriensis subinermis Engelmann, Proc. Amer. Acad. 3: 300. 1856. Opuntia polyacantha albispina Coulter, Contr. U. S. Nat. Herb. 3: 437. 1896. Opitniiti pulvacanllia borealis Coulter, Contr. U. S. Nat. Herb. 3: 436. 1896. Opuntia polyacantha platycarpa Coulter, Contr. U. S. Nat. Herb. 3: 436. 1896. Opuntia polyacantha watsonii Coulter, Contr. U. S. Nat. Herb. 3: 437. 1896. Opuntia schweriniana Schumann, Monatsschr. Kakteenk. 9: 148. 1899. 199. FIG. 247.—Opuntia polyacantha. Low, spreading plants, with fibrous roots, usually forming small clumps; joints not very thick, orbicular, usually less than 10 cm. in diameter, generally light green; areoles small, closely set, usually less than i cm. apart, all spiny; spines numerous, often 9, those from the sides mostly short, appressed, and white, but often i or 2 of these elongated and like those from the upper and marginal areoles, dark brown, with lighter tips and about 3 cm. long; glochids yellow; flowers small, 4 to 5 cm. long, including the ovary; sepals tinged with red; petals lemon-yellow; stigma-lobes green; fruit dry, oblong, 2 cm. long, bearing small clusters of white, acicular spines at the areoles; seeds white, 6 mm. long, acute on the margin. Type loca
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