io6 



TH^ CACTACEA^. 



\ 



v^i 



I or 2, subulate, usually brownish when young, in age straw-colored; flowers pale yellow, rather 

 large for the plant; petals few, about 8, spreading, acute. 



Typ 



gned to South America, but not known from 



!ity; Schumann, in his Keys, however, says West Indies. 



This species has usually passed under the name of O. foliosa, although all writers seem 



4 



- * 



to agree that the older name, O. pusilla, was given to the same sp 

 the series Aurantiacae rather than in the Curassavicae. 



Specimens distributed from European gardens as O. foliosa 

 typical, and are probably referable to 0. dmmmondii. 



may 



Tephrocactus pusillus Lemaire 



1868), an unpublished name, referred by 



Lemaire to his third section of Tephrocactus, may 



it to Opimtia pusilla. 



Illustration: Pfeiffer and Otto, Ab- 



Index Kewensis 



foliosa. 



Figure 129 is copied from 

 tration above cited. 



Op 



89. Opuntia darrahiana Weber in Gosselin, 

 Bull. Mus. Hist. Nat. Paris lo'r^'sSS. 

 1904. 



Growing in masses, 2 to 2.5 dm, high 

 3.5 to 4 dm. broad, very much branched, 

 joints 7 to 8 cm. long by 4 to 5 cm. broad, bright green 

 to sea-green ; areoles somewhat elevated, especially when 

 young, I cm. apart; spines 6, the two uppermost the 

 longest, these 4 to 4.5 cm. long, all suberect, white or 



gra 



fruit 



Type locality 

 Distribution: 



from 



cality. 



small group 



from the Turks 



the Bahaman Archipelago. It was introduced 

 into Europe by the late Charles Darrah. 



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i 



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9 



M 

 \ 



J , 





t - 



J " 



-'rr 



^ . 



> 



■ ¥ 



Fig. 129. — Opuntia pusilla. 



'^^ 



We know the olant onlv from 



specimens preserved 



known 



herbarium 



r 

 i " r' ^ 



O. nashii, and O.lucayana. The description of 0. darrahiana does not agree with any of 



these. 



not improbable. 



IS series h 

 Bahamas 



^ n 



:■- 



Series 3. AURANTIACAE. 



The species of this senes are low plants, mostly with readily detached joints; the main stems are 

 often terete or turgid, the ultimate joints narrow and flat. They inhabit southeastern South Amer- 

 ica Durmg the expedition to Brazil and Argentina conducted by Dr. Rose in the summer of 1915, 



onlv a few of the soecies here frrniinprl wprp fniin/^- r»f QV.^f^^ ^^ii^„*.„j 1 _j- ^, • ,» -.a. 



1-* 



grou 



of 1 9 16-17. Dr. Spegazzini has given us photographs of several. 



We recognize 8 species, and have appended another, which may 



. V 



J 



r 



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.\ 





, 4 L T 



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^ ^ 





-. ■ -<^- ■ 



