. Bursa bursa-pastoris and Bursa heegeri biotypes and hybrids. Bursa heegeri; Plant hybridization. Fig. 4. Fig. 5. Fig. 4:.—Bursa bursa-fiastoris heteris. Typical specimen from offspring of plant shown in fig. 3. Fig. 5.—Bursa bursa-pastoris heteris. Offspring of sib of plant shown in fig. 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, Carnegie Institution

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Keywords: ., bookcentury1900, bookdecade1900, booksubjectplanthybridization