THE CACTACEAK. 



98. Opuntia grosseiana Weber in Gosselin, Bull. Mus. Hist. Nat. Paris lo: 391. 1904. 



Described as having joints intermediate between those of Opuntia data and 0. anacantha, and 

 resembling these species. 



Type locality: In Paraguay. 



Distribution: Paraguay. 



Introduced from Paraguay by Hermann Grosse ; known to us only from the description. 



Series 4. TUNAE. 

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

 detached joints, bearing acicular or subulate, often numerous, yellow or white spines. The 

 species inhabit the West Indies, Mexico, Guatemala, and northern South America. 



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"VS Js^ mf^jSmS^Si^^ 



Fig. 135. — Opuntia utkilio. Fig. 136. — Opuntia anacantha. 



, . , , . Key to Species. 



Joints glabrous. 



Spines slender, acicular. 

 Spines white. 

 Joints dull. 



Joints dark green, repand; areoles somewhat elevated 99- 0- bella 



Joints light green, not repand ; areoles not elevated. 



Spines several at the areoles; plant ascending 100. 0. triacantha 



Spines 1 to few at the areoles or often wanting; plant erect loi. O. jamaicensis 



Joints shining loio. 0. guatemalensis 



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



Spines stout, subulate. 



Spines white; joints relatively thick, turgid 102a. 0. pennellii 



Spines yellow, at least when j^oung; joints relatively thin. 

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



Joints repand; spines bright yellow 103. 0. antillana 



Joints not repand; spines pale yellow 103a. O. caracasana 



Plants tall, i to 2 meters high. 



Joints obovate or broadly elliptic 104. 0. wentiana 



Joints narrowly oblong or oblong-obovate 104a. 0. aequatorialis 



