""Bursa Bursa-Pastoris And Bursa Heegeri Biotypes And Hybrids"" is a scientific book written by George Harrison Shull and published in 1909. The book focuses on the study of two plant species, Bursa bursa-pastoris and Bursa heegeri, and their different biotypes and hybrids. Shull provides detailed descriptions of the morphology, anatomy, and reproductive biology of these species, as well as their distribution and ecological significance. The book...