. Bulletin of the Department of Agriculture. Agriculture; Agriculture. SEED CHAEACTEES OF STJDAl!f GEASS AjSTD JOHNSON What appear to be exceptions to the general rule of seed fail occur in both kinds of seed, but the presence or absence of the distinguishing suture is evident under a good magnifier. I, 11 DISTINGUISHING CHARACTERS OF THE SEEDS OF SUDAN GRASS. Sudan grass seeds in the hull (fig. 3, ^) vary from eighteen one-hundredths to twenty-five one-hundredths of an inch in length, exclusive of the short stem. Most of the seeds bear at the base of each a short stem (fig. 3, a)
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. SEED CHAEACTEES OF STJDAl!f GEASS AjSTD JOHNSON What appear to be exceptions to the general rule of seed fail occur in both kinds of seed, but the presence or absence of the distinguishing suture is evident under a good magnifier. I, 11 DISTINGUISHING CHARACTERS OF THE SEEDS OF SUDAN GRASS. Sudan grass seeds in the hull (fig. 3, ^) vary from eighteen one-hundredths to twenty-five one-hundredths of an inch in length, exclusive of the short stem. Most of the seeds bear at the base of each a short stem (fig. 3, a), which is jaggedly broken at its extremity. This stem repre- sents the upper portion of a rachis segment and is expanded at its articulation with the spikelet, or seed. The articulation may be marked by a slight constriction (fig. 3, h), but it has no distinct suture. The ap- pendages of the spikelet usually are jag- gedly broken and not expanded at the apex (fig. 3, c). The missing portion corre- sponds to the short stem of the spikelet duster of Johnson grass, , ., ^ enlarged: a, 0, Fertile spikelets; 6, 6, QeSCriDeCl. sterile spikelets; c, c, axis, or rachis. The seed hull is mainly straw colored of the duster; d,rf, pedicels of sterile . . flowers;«, f, sutures at the articula- or hght tawny. Many seeds are tmged tion of spikelets with the axis;/, or spotted with brown. Some are tinged ^""^^^^ °f t^^ inflorescence bearing ^ 1 • T 1 rrn 11 ^^^ ^^^^ cluster. or spotted with red. ihe darkest are blackish brown. In general, commercial seed has a smaller pro- portion of reddish and blackish brown seeds than Johnson grass. The hulled grains (fig, 3, S) vary from thirteen one-hun- dredths to eighteen one- hundredths of an inch in length and are light reddish brown. They are larger, more com- monly elliptical in out- line, and lighter colored than in Johnson grass. Even in the smaller grains the embryo is r(ilativ(;ly larger than that found in Johnson
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