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THE CACTACEAE 
‘DESCRIPTIONS AND ILLUSTRATIONS OF 
PLANTS OF THE CACTUS FAMILY 
BY 
N. L. BRITTON anp J. N. ROSE 
VoLuME IV 
a 
\*: 
OD . 
HOUR) 
Tue Carnecie Institution oF WasHINGTON SEE 
WasHINGTON, DECEMBER 24, 1923 ?¢ 
JUN s 
