20 Addisonia 



As understood by me, Opuntia lasiacantha has its closest relative 

 in Opuntia megacantha, also native of Mexico, which differs from it 

 in having larger joints, longer and stouter spines, and larger fruit; 

 perhaps these differences are neither constant enough nor sufficient 

 to constitute specific distinctness. 



The plant from which our illustration was painted was collected by 

 J. N. Rose in 1906, near the City of Mexico; it has flowered fre- 

 quently at the New York Botanical Garden, and cuttings from it have 



yielded several large specimens. 



N. L. Brixton. 



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