| Main Characteristics Phylogenetic Analysis Generic Description & Key to Species S. hahnianus Additional Specimens Examined S. hoffmannii Additional Specimens Examined S. parviflorus Additional Specimens Examined Acknowledgements & Literature Cited 
 
 Figure Legend:
 Figure 1 Figure 2 Figure 3 Figure 4 Figure 5
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								| S. parviflorus (Matuda 1696) polar view of 3-aperturate grain. |  | 
						 
							
								| S. parviflorus (Steyermark 46632) polar view of 4-aperturate grain. |  | 
						 
							
								| S. parviflorus (Matuda 1296) interapertual view |  |  
			 
			 
				
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								| S. hoffmannii (Skutch 3325) polar view |  | 
						 
							
								| S. hoffmannii (Liesner at al. 15444) interapertural view |  | 
						 
							
								| S. hoffmannii (Skutch 3325) apertural view |  |  
			 
			 
			 
				
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								| S. hahnianus (Wendt et al. 2769) interapertural surface |  | 
						 
							
								| S. hahnianus (Hernandez G. & Gonzalez L. 1777) interapertural view |  | 
						 
							
								| S. hahnianus (Hernandez G. & Gonzalez L. 1777) apertural view |  |  
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