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			| Secretory Cavities and Canals | 
		
			| Curtis, Lersten, and Nowak 2002 rev. 2015 | 
		
			| Freehand cross section showing midrib and demonstrating foliar oil reservoirs in live tissue of in Solidago canadensis (Canadian goldenrod). Lersten and Curtis. Nord. J. Bot. 9: 281-287.
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