vexillar

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CIDE DICTIONARY

vexillar, [Cf. F. vexillaire, L. vexillarius a standard bearer.].

Of or pertaining to an ensign or standard. [1913 Webster]
Of or pertaining to the vexillum, or upper petal of papilionaceous flowers. [1913 Webster]

Vexilary æstivation (Bot.), a mode of æstivation in which one large upper petal folds over, and covers, the other smaller petals, as in most papilionaceous plants.