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OPUNTIA. 



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and is probably referable to O. macrorhiza. Through the kindness of Mr. Nelson, we ha\'e 



seen a joint of this species. 



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1856) proposed as a subspecies but not formally indicated, so 

 juei macrorhiza Coulter (Contr. U. S. Nat. Herb. 3: 430. 1896) 



Illustrations: 



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Cult. f. 82, 83; Rep 

 Addisonia i : pi. 19. 



Card. Nicholson f. 606; W. Watson. Cact. 



Mo. Bot. Card. 21 : pi. 20, in part, this last as Op 



Plate XIV, figure 5, represents a 

 flowering joint of the plant collected 

 at Irving, Dallas County, Texas, by 

 Albert Ruthin 1912. 



123. Opuntia plumbea Rose, Smiths. 



Misc 



1908. 



Plant low, creeping, lo cm. high, 20 

 to 30 cm. broad, few jointed; joints small, 

 nearly orbicular, 3 to 5 cm. in diameter, 

 of a dull lead-color, the surface some- 

 what wrinkled in dead specimens ; areoles 

 rather large for the size of the joints; 

 spines pale brownish, slender, usually 

 porrect, often 3 cm. long, mostly 2 in 

 number, rarely as many as 4, sometimes 

 one or even wanting; flowers very small, 

 red; ovary naked; fruit 1.5 to 2 cm. long 

 with a few small areoles and these simply 

 woolly; seeds small, rather turgid, smooth, 

 and with a shallow obtuse margin. 



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Type locality: San Carlos Indian 

 Reservation, Arizona. 



Distribution: Arizona. 



This is a peculiar little opuntia wit 

 from the original collections made by Mr 



Figure 164. is from a ohotoeraoh of 



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Fig. 164. — Opuntia plumbea 



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1904 



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1856. 



J^124. Opuntia tortispma 



V opuntia tortisperma Engelmann, Pac. R. Rep. 4: pi. 23, f. i to 5. 1856. 



Opuntia cymochila Engelmann, Proc. A'mer. Acad. 3: 295. 1856. 

 Opuntia rafinesquei cymochila Engelmann, Proc. Amer. Acad. 3: 295 



1856. 



1856. 



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^yuruza Tneaacanma greenei s^ouitci, v^unu. »->■ *^- j^-*^^- ^-^ j- t^-- 



Opuntia mesacantha oplocarpa Coulter, Contr. U. S. Nat. Herb. 3: 431. 

 Opuntia greenei Engelmann in Britton and Rose, Smiths. Misc. Coll. 50: 523. 

 (?) Opuntia sangui^^^^^^^ nHffith*^ Prnr. Biol. Soc 



1908. 



1914 



Prostrate and creeping; joints ascending, orbicular to obovate, 15 to 20 cm. long; arcojcs 1.5 to 

 3 cm. apart; spines several; of ten 6 to 8, the upper and longer ones 3 to 6 cm. long either white, yel- 

 owi"«Ti r.^ 1 „.„. _„ .1 ' i„„ „^„ o^j^o or^nf tViP nthpr< snreadine or with the lowermost 



lowish, or brown ; on the upper areoles one spine erect, the others spreading 



ones deflexed; flowers sulphur-yellow, 6 to 7.5 cm. broad; fruit rather large, 4 to 5 cm. long, 2 to 3 



gula 



i'ith a slight indentation at the hilum. 



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Type locality: On the Camanchica Plains iiear the Canadian River. 

 Distribution: Wisconsin to South Dakota, Texas, Kansas, Colorado, 



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