. Bulletin of the Department of Agriculture. Agriculture; Agriculture. BULLETIN 406, U. S. DEPAETMENT OF AGRICULTURE. DISTINGUISHING CHARACTERS OF THE SEEDS OF JOHNSON GRASS. Jolmson grass seeds in tlie hull (fig. 4, 1) vary in length from fifteen one-hundredths to twenty-two one-hundredths of an inch. Most of the seeds have a smooth, rounded, and light- colored scar at the base. The appendages of the seed (fig. 4, h) are mostly entire, expanded, cup shaped, and smooth at the apexes, correspond- ing with the scar at the base of the seed. The uniformly smooth border of the expanded, cup- a
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. BULLETIN 406, U. S. DEPAETMENT OF AGRICULTURE. DISTINGUISHING CHARACTERS OF THE SEEDS OF JOHNSON GRASS. Jolmson grass seeds in tlie hull (fig. 4, 1) vary in length from fifteen one-hundredths to twenty-two one-hundredths of an inch. Most of the seeds have a smooth, rounded, and light- colored scar at the base. The appendages of the seed (fig. 4, h) are mostly entire, expanded, cup shaped, and smooth at the apexes, correspond- ing with the scar at the base of the seed. The uniformly smooth border of the expanded, cup- apex, together separation of the. Fig. 4.—Johnson grass seeds, enlarged. ITnhulledseeds,spLkelets (1); hulled grains (2): a, a, Scar of the hull; 6, b,appendages of the seed with expanded, cup-shaped apexes; c, scar of the grain; d. embryo. shaped with the smooth seed scar, results from the norma' seed along a definite suture. The prevailing color of mature seed hulls is blackish brown. Many seeds are partially or wholly reddish. Some are straw colored. A few are tawny or light brown. The hulled grains (fig. 4, 2) vary from eight one-hundredths to twelve one-hundredths of an inch in length. They usually are oval, sometimes oval-elliptical in outline, the embryo end tending to be the more pointed. The color is dark reddish brown. They are noticeably smaller and darker colored than those of Sudan grass and have a relatively narrower embryo (fig. 4, d).. 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 United States. Dept. of Agriculture. [Washington, D. C. ?] : The Dept. : Supt. of Docs. , G. P. O.
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