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OPUNTIA. 



149 





151. Opuntia discata Griffiths, Rep. Mo. Bot. Gard. 19: 266. 1908. 



Opuntia gilvescens Griffiths, Rep. Mo. Bot. Gard. 20: 87. 1909. 

 Opuntia riparia Griffiths, Proc. Biol. Soc. Washington 27: 26. 1914. 



1 



Plants bushy, spreading, sometimes 15 dm. high; joints thick, orbicular to broadly obovate, 

 2.5 dm. in diameter or less, pale bluish green, somewhat glaucous; areoles rather few, distant, in 

 age becoming very large, hemispheric, filled with short brown wool; spines usually 2 to 4, sometimes 

 7 or more in old areoles, 2 cm. long or more, grayish with dark bases, somewhat flattened; flowers 

 large, 9 to 10 cm. broad, light yellow, darker near the center; style white; stigma-lobes green; fruit 

 magenta, pyriform, 6 to 7 cm. long.' 



Type locality: Foothills of Santa Rita Mountains, Arizona. 



Distribution 



mesas 



Mo. Bot. Gard. 20: pi. 2, f. .s; pl. 7; pl- i3> f- 6, all as Opuntia 



Amer 



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Mo 



Plate XXIV, figure 2, is from 

 Mountains, Arizona, in 191 6; Op 



152. Oountia rastrera Weber. Diet. 



1898. 



?Opiintia lucens Griffiths, Rep. Mo. Bot. Gard. 19: 269. 1908. 



Creeping plant; joints circular to obovate, the largest 2 dm. in diameter; spines white several 

 from an areole, the longest 4 cm. long; glochids yellow; flowers yellow; fruit purple, acid, obovoid. 



Type locality: San Luis Potosi, Mexico. 



Distribution: The type locality and vicinity. , ^ •.. • 



This species was very briefly described in 1898 by Dr. Weber, who states that it is 



O. tuna, states 



om O. tuna, the Jamaican species. Schumann 



from Mexico 



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From descriptions we are referring here 0. lucens Griffiths, also described from San 

 Luis Potosi specimens. Dr. Griffiths states that his 0. lucens is related to 0. .;/g./man;ni, 

 but has a different habit; he says it is called cuija by the Mexicans, but that it is very 

 different from Opuntia cuija. 



Series 12. ELATIORES. 



Tall species, with flat, broad, persistent joints, the areole^ bearing aeieular. ^^^ace^s or^ti^^^^^^^^^^^ 

 brown spines, or some species spineless. We know about twelve species, most of them boutU 



Jul 



Key to Species. 



153. 0. hrunnescens 



Joints very spiny. 



Spines not banded. * 



Areoles surrounded by a purple blotch 



Areoles not surrounded by a purple blotch. 154. 0. galapageia 



Spines setaceous; petals yellow • • • • •; '.\'''^a'^' nV^nffe 



Spines, when present, aeieular or subulate; petals mostly red or orange. ^^^^ dclaeliana 



Joints strongly undulate; spines short, stout 



Joints not undulate or scarcely undulate. ^^^ q hergeriana 



Spines light brown to straw-colored ^ g q j^anburyana 



Spines up to 5 cm. long; joints shining 



Spines 3 cm. long or l^^^^rj^.^^^spines i to 4 at an areole or . . 



Flowers 12 to 15 m™. wide, spmcs 1 lu ^ ^^^ O.qnitensts 



wanting • •. ; " ' * ' * .* ,: Vreolc - . i S9<i- 0. socdcrstromiana 



rer. c; to 6 cm. wide; spines up to lo at an arcolc .w^ ^^ schumannii 



i6i. O, fuliginosa 

 0. zcbrina 



Flowers 5 to 

 Spines subulate, stout; joints shining 



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spines SUUUIULC, SI.I^"M. J"'"--."-.— r;" ^UJc s„r!cs'l '"'• 



Spines aeieular; petals yellow; joints shining '"^hif series, j ^^^^ 



. Spines distinctly banded ; joints dark green, obscurel> glaucous 



Joints usually spineless. 



Bushy, I to 2 meters high; flowers rose 



Erect, 3 to 4 meters high; flowers orange-red 



162. 0. holdinghii 



163. 0. distans 



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