| CLA | a system of biological taxonomy based on the quantitative analysis of comparative data and used to reconstruct trees summarizing the (assumed) phylogenetic relations and evolutionary history of groups of organisms |
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| CLA | a flattened stem resembling and functioning as a leaf |
| CLA | a tree diagram used to illustrate phylogenetic relationships |
| CLA | type genus of Cladoniaceae |
| CLA | an erect grayish branching lichen of Arctic and even some north temperate regions constituting the chief food for reindeer and caribou and sometimes being eaten by humans |
| CLA | a family of lichens |
| CLA | a flattened stem resembling and functioning as a leaf |
| CLA | one of two genera of stilts |
| CLA | web-footed Australian stilt with reddish-brown pectoral markings |
| CLA | yellowwoods |
| CLA | small handsome round-headed deciduous tree having showy white flowers in terminal clusters and heavy hardwood yielding yellow dye |
| CLA | small handsome round-headed deciduous tree having showy white flowers in terminal clusters and heavy hardwood yielding yellow dye |