. An illustrated flora of the northern United States, Canada and the British possessions : from Newfoundland to the parallel of the southern boundary of Virginia and from the Atlantic Ocean westward to the 102nd meridian . CACTACEAE. Vol. 11. Western Prickly Pear. Devil's Tongue. Fig. 2987. Cactus Jiiimifiisus Raf. Ann. Nat. 15- 1820. Opuntia humifusa Raf. Med. Bot. 2: 247. 1830. O. mcsacantha Raf.: Ser. Bull. Bot. Gen. 216. 1830. O. 7fa^H(?j(?»ii Engelm. Pac. R. R. Rep. 4: 41 1856. Prostrate, similar to the preceding specie:; joints obovate to siiborbicular, or oval, usually deep green, 2'-$'
. An illustrated flora of the northern United States, Canada and the British possessions : from Newfoundland to the parallel of the southern boundary of Virginia and from the Atlantic Ocean westward to the 102nd meridian . CACTACEAE. Vol. 11. Western Prickly Pear. Devil's Tongue. Fig. 2987. Cactus Jiiimifiisus Raf. Ann. Nat. 15- 1820. Opuntia humifusa Raf. Med. Bot. 2: 247. 1830. O. mcsacantha Raf.: Ser. Bull. Bot. Gen. 216. 1830. O. 7fa^H(?j(?»ii Engelm. Pac. R. R. Rep. 4: 41 1856. Prostrate, similar to the preceding specie:; joints obovate to siiborbicular, or oval, usually deep green, 2'-$' long; leaves subulate, spread- ing, 3"-5" long; bristles reddish brown; spines few, mostly near the margins of the joints. 1-4 together, whitish, or reddish at base and apex, deflexed, or the longer one spreading and i'-i' long; flowers yellow, often with a reddish centre, 2j'-34' broad; petals 10-12; fruit club-shaped, not spiny, fleshy, edible, iJ'-2' long. In dry sandy or rocky soil, Ohio to Minnesota. Kentucky. Missouri, Nebraska and Texas. Summer. Opuntia macrorhiza Engelm., a related species with a deep woody root, abundant in Texas, is re- ported to range northward into Missouri and Kansas. 3. Opuntia tortispina Engelm. Tvvisted-spined Cactus. Fig. 2988. Opuntia tortispina Engelm. Pac. R. R. Rep. 4: 21. 1856. Stems prostrate, the orbicular-obovate flattened joints 6'-8' long. Spines 3-5, yellowish, becoming whitish, angled and channeled, sometimes twisted, the longer ones li'-2*' long, with 2-4 more slender and shorter ones; flowers sulphur-yellow, 2i'-3' broad; fruit ovoid, fleshy, unarmed, about 2' long and l' in diameter; seeds orbicular, slightly notched at the hilum, 2"-3" wide. Plains of Missouri and Nebraska to Texas. Summer.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
