Aaron's beard

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Aar·on's beard

 (âr′ənz, ăr′-)
A shrubby semi-evergreen plant (Hypericum calycinum) of Eurasia, having yellow flowers with numerous protruding stamens and often grown as a ground cover. Also called rose of Sharon.

[From the prominent tufts of stamens, in reference to Psalms 133:2.]

Aaron's beard

(Plants) another name for rose of Sharon1
References in periodicals archive ?
Verses 2 and 3 repeat the Hebrew verb "to go down" in three places: running down Aaron's beard, running down Aaron's collar, and falling dew.
It is like precious oil upon the head, coming down upon the beard, even Aaron's beard .
Aaron's beard (Hypericum calycinum), bright yellow; late spring.