Having a single main stem or axis, as in certain plants with unbranched or minimally branched growth patterns.
From Greek haplos (single) + caulis (stem) + -escent (becoming or tending to be). A botanical term that emerged in the 18th-19th century to classify plant growth forms.
Botanists invented this term to describe plants like some palm trees that have just one main trunk with leaves sprouting from the top, but the word is so specialized that even many biologists have never encountered it!
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