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Opal Phytoliths in Bouteloua Eriopoda Torr. Roots and Soils¹

ABSTRACT

Identification of phytoliths from Bouteloua eriopoda Torr. (black grama) roots was based on repetitive size and shape, low density, acid insolubility, and lack of crystallinity. Refractive index, and contents of water and SiO₂ support identification as opal. These distinctive rectangular phytoliths were the most commonly observed form in the A horizons of several soils and paleosols.

¹ Journal article no. 305, Agricultural Experiment Station, New Mexico State University, Las Cruces. This research is in part taken from the Master's thesis submitted by the senior author.

² Former Graduate Assistant, New Mexico State University, now Soil Scientist, Soil Conservation Service, Los Lunas, New Mexico, and Associate Professor of Soils, New Mexico State University, respectively.

Received for publication August 12, 1968. Accepted for publication January 9, 1969.