Where does “pearl grass” come from?

pearl grass (English) comes from English Pearl, from Middle English perle, from Old French perle, from Medieval Latin perla, from Latin perna, from Proto-Italic persnā, from Proto-Indo-European tpḗrsneh₂, from Proto-Indo-European sperH- — to kick.

pearl grass (English): Briza media, a variety of grass; Oldenlandia...

Definitions

  1. Briza media, a variety of grass; Oldenlandia...

Ancestry of “pearl grass”, step by step

pearl grass traces back through two separate lines of ancestry.

via English Pearl

StepLanguageWordMeaning
1EnglishPearlA placename
2Middle EnglishperleA pearl; Any round object, especially when shiny;...
3Old Frenchperle
4Medieval Latinperla
5LatinpernaA haunch or ham together with the leg, gammon; A...
6Proto-Italicpersnā
7Proto-Indo-Europeantpḗrsneh₂heel, upper thigh
8Proto-Indo-EuropeansperH-to kick

via English grass

StepLanguageWordMeaning
1EnglishgrassAny plant of the family Poaceae, characterized by...
2Middle EnglishgrasA grass; Any plant; especially a herbaceous one;...
3Old Englishgræsgrass
4Proto-West Germanicgrasgrass
5Proto-Germanicgrasągrass
6Proto-Indo-Europeanǵʰreh₁-to become green, grow; to grow; to green, to grow
Every word from Proto-Indo-European sperH-Every word from Proto-Indo-European tpḗrsneh₂Every word from Proto-Italic persnā