. Bulletin of the Department of Agriculture. Agriculture; Agriculture. jn-^'^\jiu I BULLETIN No. 406 Contribution from the Bureau of Plant Industry WM. A. TAYLOR, Chief. ^^^^"^Unt- Washington, D. C. PROFESSIONAL PAPER September 5, 1916 DISTINGUISHING CHARACTERS OF THE SEEDS OF SUDAN GRASS AND JOHNSON GRASS. By F. H. HiLLMAN, Assistant Botanist, Seed Laboratory. CONTENTS. Page. Introduction 1 Distinguishing characters of the seeds of Sudan grass 3 Page. Distinguishing characters of the seeds of Johnson grass 4 Apparent' exceptions to the distinguishing characters described 4 INTRODUCT
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. jn-^'^\jiu I BULLETIN No. 406 Contribution from the Bureau of Plant Industry WM. A. TAYLOR, Chief. ^^^^"^Unt- Washington, D. C. PROFESSIONAL PAPER September 5, 1916 DISTINGUISHING CHARACTERS OF THE SEEDS OF SUDAN GRASS AND JOHNSON GRASS. By F. H. HiLLMAN, Assistant Botanist, Seed Laboratory. CONTENTS. Page. Introduction 1 Distinguishing characters of the seeds of Sudan grass 3 Page. Distinguishing characters of the seeds of Johnson grass 4 Apparent' exceptions to the distinguishing characters described 4 INTRODUCTION. The close relationship of Sudan grass and Johnson grass leads to a pronounced similarity in their seeds. The two kinds of seed can be distinguished, however, when their comparative size and certain features of their appearance due to differences in development are considered. Oakley ^ and Vinall ^ have referred to these characters as useful in distuiguishuig these two kinds of seeds. When properly interpreted, the distinguishing characters are believed to be sufficiently reliable to make possible an accurate quantitative analysis of a mixture of the two kinds of seed, even though unhuUed grains of both grasses are present. When the seeds of the two kinds are under observation, the larger size of the Sudan grass seeds, includuig the hulled grains, is readily noticeable. The lighter color of the hulled grains is also evident. Distinguishing characters presented by either of the two kinds of seed observable in the absence of the other depend chiefly on a difference in the development of the plants preparatory to seed fall. This may best be understood by first considering the structure of the terminal clusters of the general seed clustc^r, or inflorescence taken coUoctivrJy. One of these seed (dusters, shown in figure 2, illustrating > Oakley, K. A. Some new grasses for the South. U. S. Dept. Agr. Yearbook, 1912, p. 495-504, pi. 65-70. 1913. 2 \'iriall, If. N. U. S. Dept. A
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