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1 86 



THE CACTACEAE 



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Fig. 227 — Opuntia megacantha on Lanai, Hawaiian Islands. 



Type locality: In Mexico 



Much cultivated in Mexico; grown also in Jamaica 



from 



Salm-Dvck essentially as follows: Erect 



cm. loner bv 7.=; cm 



thick; areoles close together, filled with gray wool; 

 glochids brownish, becoming blackish ; spines 7 to 



and 2.5 cm. or more 



the longest one defiexed, 5 

 known; leaves 



somewhat radiating, 



cm 



small 



Opuntia megacantha trichacantha Salm-Dyck 

 was given as a synonym of this species by Forster 

 (Handb. Cact. 486. 1846), but was never pub- 

 hshed. 



Op 



trihuloides Griffiths (Monatsschr 



Kakteenk. 23: 137. 1913), according to the de- 

 scription, is of this relationship. 



This is the chief Mission cactus. It is the 



from 



IS one of the commonest culti 

 Mexico, having numerous forms 



many of them bearing local names 



Illustrations: Ariz. Agr. Exp. 



67: 



Mo 



Opuntia castillae. 



Mo 



Bot. 4: 572. f. 6. 



Amer. J 



Plate XXXII, figure 4, represents a flowering 



joint of a plant in 



same 



received 



from Fairmount Park, Philadelphia, in 1905. 



Figure 226 is from 



a plant in 



the collection of the New York Botanical Garden • 



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Fig 22S. — Opuntia megacantha. X0.4 



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