. Bursa bursa-pastoris and Bursa heegeri biotypes and hybrids. Bursa bursa-pastoris; Bursa heegeri; Plant hybridization. BIOTYPES AND HYBRIDS. 15 w y. ^\. 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