Having two stipules; a past-participle or archaic adjectival form emphasizing the presence of paired leaf-base structures.
From bi- (two) + stipuled (having stipules). Uses the -ed suffix to create an alternative adjective form, less common than bistipular or bistipulate.
English botanical terminology is like Victorian scientists trying to describe everything in Latin—'bistipuled' sounds fancy but just means 'has two of those little leaf wing-things,' and botanists still argue about which suffix is best!
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