. Bursa bursa-pastoris and Bursa heegeri biotypes and hybrids. Bursa bursa-pastoris; Bursa heegeri; Plant hybridization. 46 BURSA AND HEEGERI. Fig. 21.—Bursa heegeri (Solms-Laubach). From photographs taken at three different stages of 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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