Fig. 5.—Starch of Sanguinaria
magnified 1,200 diameters. The grains are spherical or spheroidal, mostly simple, sometimes double; hilum central and usually inconspicuous and unfissured; grains smooth and with no obvious stratification lines; polarization cross faint, equal-armed.
This image is from Some further observations on the structure of Sanguinaria canadensis in the American Journal of Pharmacy, 1895.