Having no spur or spur-like projection, especially in botany describing flowers that lack a tubular extension on the petal or sepal.
From Latin e- (without) + calcar (spur, from calx meaning heel). The term was developed by Renaissance botanists to classify flowers. It precisely describes structural absence in plant anatomy.
When botanists needed to describe flowers WITHOUT spurs, they invented 'ecalcarate'—sometimes the most interesting words describe what's missing, not what's there!
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