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THE CACTACEAE. 



grosseiana Weber in Gosselin, Bull. Mus 



1904 



resembling these species. 



Opuntia 



Paraguay 



Distribution: Paraguay. 



from Paraguay by Hermann Grosse ; known to us only from 



Series 4. TUNAE. 



detached 



Bushy, ascending, depressed, or erect plants, with rather large and more or less readily 



ioints. bearine acicular or subulate, often numerous, yellow or white spines. The 



West Indies, Mexico 





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Fig. 135. — Opuntia utkilio. 





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Fig. 136.— Opuntia anacantha* 



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Joints glabrous. ^^Y TO SpECIES. 



Spines slender, acicular. - 



Spines white. 

 Joints dull. 



Joints dark green, repand; areoles somewhat elevated 99. O. bella 



Joints light green, not repand; areoles not elevated. 



Spines several at the areoles; plant ascending loo. 



Spines i to few at the areoles or often wanting; plant erect loi. 



Joints shining loia. 



Spines yellow, at least when young; plant bushy branched 102. 



Spines stout, subulate. 



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0, triacantha 

 O, jamaicensis ^ 

 O, guatemalensis 

 O. tuna 



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Spines white; joints relatively thick, turgid 102a. 



Spines yellow, at least when young; joints relatively thin. 

 Plants low, spreading, 2 dm. high or less. 



Joints repand; spines bright yellow 103. 



Joints not repand; spines pale yellow 103a. 



Plants tall, i to 2 meters high. 



0. pennellii 



0. antillana 

 O. caracasana 



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Joints obovate or broadly elliptic 104, O. wentiana 



Joints narrowly oblong or oblong-obovate 104a. O. aequatorialis 



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