grasses

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The pertinacity and predominance of weeds
Asa Gray

American Journal of Science September 1879, s3-18 (105) 161-167; DOI: https://doi.org/10.2475/ajs.s3-18.105.161
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Silica of grasses and other plants carried up as diatoms or other siliceous grains, and not in solution or as soluble silicates
P. B. Wilson

American Journal of Science May 1876, s3-11 (65) 373-374; DOI: https://doi.org/10.2475/ajs.s3-11.65.373