| callus | 
				
					 In snails, the partial or complete cover of the umbilicus. 
					
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				| calyptra | 
				
					 In mosses, the covering lid of the capsule. 
					
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				| calyx | 
				
					 The outer circle of sepals; it is usually green. 
					
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				| capsule | 
				
					 A dry fruit, which splits to yield 2 or more seeds. 
					
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				| carapace | 
				
					 The hard upper shell of a turtle. 
					
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				| catkin | 
				
					 A dense, often drooping flower cluster spike. 
					
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				| CJIC | 
				
					 Carl Jonas Interpretive Center 
					
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				| clypeus | 
				
					 In insects, the area on the face below the antennae. 
					
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				| composite | 
				
					 When pertaining to flowers - a member of the sunflower family. 
					
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				| compound | 
				
					 When pertaining to leaves - divided into three or more parts (leaflets). 
					
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				| cordate | 
				
					 When pertaining to a leaf - heart-shaped. 
					
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				| cornicles | 
				
					 Tubes on the abdomen of aphids, which secrete chemicals to deter predators. 
					
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				| corolla | 
				
					 The inner envelope of flower petals. 
					
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				| culm | 
				
					 A flower-bearing stem of a grass or sedge. 
					
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				| cyathia | 
				
					 The flower-like structures in Euphorbia plants - plural of cyanthium. 
					
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