142 



THE CACTACHAE. 



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141. Opuntia santa-rita (GrifTiths and Hare) Rose, Smiths. Misc. Coll. 52: 195. 1908. ; 



Opuntia chlorotica santa-rita Griffiths and Hare, N. Mex. Agr. Exp. Sta. Bull. 60: 64. 1906. 

 Optintia shreveana C. Z. I^clson, Galesburg Register, July 20, 1915. 



Compact plant, 6 to 14 dm. high, with a very short trunk; joints orbicular or a little broader 

 than long, bluish green but deep purple about the areoles and margins; areoles 1.5 cm. apart, bear- 

 ing numerous chestnut-brown glochids and occasionally; a brown spine; flowers very handsome, 

 deep yellow, 6 to 7 cm. broad; ovary purple, oblong. . ' , ' 



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\ Type locality: Selero Mountains, Arizona. - 

 Distribution: Southeastern Arizona. . .t ;. ; 



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This species is one of the most ornamental of the opuntias, and although it does not 

 grow well in greenhouse cultivation, it would doubtless flourish in the Southwest, where it 

 could be given conditions similar to its wild surroundings. 



Illustrations: Smiths. Misc. Coll. 52: pi. 15; Plant World 11^^: f. 6, this last as Opuntia 

 chlorotica; Journ. Inter. Gard. Club 3: facing page 5, as 0. chlorotica santa-rita.. 



Plate XXIV, figure I, is froni a photograph taken by Dr. MacDougal of a plant near 

 Surritas, Arizona, in 1906. 



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142. Opuntia angustata Engelmann, Proc. Amer. Acad. 3: 





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292 



1856. 



Ascending to erect; joints narrow, 15 to 25 cm. long, 

 rounded above, gradually narrowing downward; areoles 

 distant, often 2.5 cm. apart, large, oblong; spines sharply 



angled, straw-coloredor whitish but with brown bases, 2.5 to 

 3.5 cm. long ; glochids brown ; fruit obovoid, 2 .5 to 3 cm. long. 



Type locality: Bottoms, Bill. Williams Fork, 

 Arizona. ^ 



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Distribution: Recorded as extending from New 

 Mexico to CaHfornia,but known definitely to us only 

 from central Arizona, perhaps extending north to Utah. 



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Engelmann' 

 2 specimens 



Opuntia angustata was based on 



New Mexico, one from 

 rnia. He stated that the 



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first and last were prostrate, while the second was erect. 



specimens 



him. The first is 



from Zuni, New Mexico, and is probably Opuntia 



phaeacantha. 



specimen is the Op 



magenta Griffiths, which is probably the same as 

 0. vascyi, while the suberect plant from the bottoms 

 of the Bill WiUiams River we have allowed to stand 

 for 0. angustata. Wooton and Standley (Contr. 

 U. S. Nat. Herb. 19: 447. 1915) suggest that the two 

 fruits illustrated by Engelmann in connection with this 

 species rriay belong to two species of Cylindr opuntia . ' 



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Fig. 180, — Opuntia angustata. 



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Illustrations: Pac. R. Rep, 4: pi. 7, f. 3, 4. 

 Figure 180 is copied from figure 1 of the i 



1854. 





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143. 



atrispina Griffiths, Rep. Mo 



1910. 



Usually low and spreading, sometimes 2 meters in diameter, but sometimes the central branches 

 nearly erect and 6 dm. high; joints rather small, nearly orbicular, 10 to 15 cm. in diameter, light 

 green, sometimes a Ihtle glaucous; lower areoles spineless; spines from the upper areoles 2 to 4, 

 the prmcipal ones spreading, flattened, dark brown, almost black at base, much lighter above; 

 glochids at first yellow or yellowish, but soon changing to broWn; flowers described as yellow, 

 changing to orange; fruit reddish purple. 



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