. Bursa bursa-pastoris and Bursa heegeri biotypes and hybrids. Bursa bursa-pastoris; Bursa heegeri; Plant hybridization. BURSA BURSA-PASTORIS AND BURSA HEEGERI BIOTYPES AND HYBRIDS BY GEORGE HARRISON SHULL. WASHINGTON, D. C. Published by the Carnegie Institution of Washington. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Shull, George Harrison, 1874-1954. Washington, D. C. , Carnegie Institution of Washington

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Keywords: ., bookcentury1900, bookdecade1900, booksubjectplanthybridization