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The Collaborative International Dictionary
Adoxa moschatellina

Moschatel \Mos"cha*tel`\, n. [Gr. ? musk: cf. F. moscatelline. See Muscadel, Musk.] (Bot.) A plant of the genus Adoxa ( Adoxa moschatellina), the flowers of which are pale green, and have a faint musky smell. It is found in woods in all parts of Europe, and is called also hollow root and musk crowfoot.
--Loudon.

Wikipedia
Adoxa moschatellina

Adoxa moschatellina (moschatel, five-faced bishop, hollowroot, muskroot, townhall clock, tuberous crowfoot) is an herbaceous perennial flowering plant in the family Adoxaceae. It grows throughout Europe, Asia, and North America, in hedgerows, cool forests, at low altitudes in the far north, to high altitudes in mountains in the south of its range. The plant and its flowers have a musk-like scent, which it emits towards evening when the dew falls. If the plant is bruised this scent disappears. In Europe, it flowers in April and May.

The names "five-faced bishop" and "townhall clock" allude to the structure of its inflorescence. This consists of five flowers: one four-petalled flower facing upwards, and four five-petalled flowers facing horizontally, as seen in the pictures.