. Bulletin of the Department of Agriculture. Agriculture; Agriculture. GENEEA OF GEASSES OF THE UNITED STATES. 287 races of American aborigines, from Peru to middle NortJi AjneTica. Several races of corn are grown in the United States/ the most im- portant being dent, the common commercial field sort, flint, sweet, and pop. P(3d corn (Z. mays tunicata Larr.), occasionally cultivated as a curiosity, is a variety in which each kernel is enveloped in the elongate floral bracts. A variety with variegated leaves {Z. mays japonica Korn.) is cultivated for ornament. 144. Coix L. Spikelets unisex
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. GENEEA OF GEASSES OF THE UNITED STATES. 287 races of American aborigines, from Peru to middle NortJi AjneTica. Several races of corn are grown in the United States/ the most im- portant being dent, the common commercial field sort, flint, sweet, and pop. P(3d corn (Z. mays tunicata Larr.), occasionally cultivated as a curiosity, is a variety in which each kernel is enveloped in the elongate floral bracts. A variety with variegated leaves {Z. mays japonica Korn.) is cultivated for ornament. 144. Coix L. Spikelets unisexual; staminate spikelets 2-flowered, in twos or threes on the continuous rachis, the normal group consisting of a pair of sessile spikelets with a single pedicellate spikelet between, the lat- ter sometimes reduced to a pedicel or wanting; glmnes membranaceous, obscurely nerved; lemma hyaline, nearly as long as the glumes, awnless, 5-nerved; palea hyaline, a little shorter than the lemma; sta- mens 3; pistillate spike- lets 3 together, 1 fertile and 2 sterile at the base of the inflorescence; fer- tile spikelet consisting of 2 glumes, 1 sterile lemma, a fertile lemma, and a palea; glumes sev- eral-nerved, hyaline be- low chartaceous in the upper narrow pointed i'ig. i74. part, the first very broad, infolding the spikelet, the margins infolded beyond the 2 lateral stronger pair of nerves, the second glume narrower than the first, keeled; sterile lemma about as long as the second glume, similar in shape but a little narrower, hyaline below, somewhat chartaceous above; fertile lemma hyaline, nari'ow, somewhat shorter than the sterile lemma; palea hyaline; narrow, shorter than the lemma; sterile spikelets consisting of a single narrow tubular glume as long as the fertile .spikelet, somewhat -Job's-tcars, Coix lacJiryma-jobi. tion of plant, X 1. Upper por- ' Hic Moutfe'omnry, The Corn Crops, 15, 1913: Stiirlcvant, U. S. Dopt. Agr., Off. Exp. 8ta. Bull. 57. Pleas
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