. The cereals in America. Grain. III. WHEAT. I. STRUCTURE. 51. Relationships.—Wheat belongs to the family of true grasses (Gramineac). The Gramijieae are characterized by having hollow stems with closed joints, alternate leaves with their sheaths split open on the side opposite the blade. Wheat is included under the tribe Hordeae, in which the spikelets are one to many-flowered, sessile and alternate, thus forming a spike. (59) To this tribe belong also rye and barley, as well as the cultivated rye grasses {Lolunn pcrenne L. and L. itali- aiin Beauv.). This tribe also includes some troublesome
. The cereals in America. Grain. III. WHEAT. I. STRUCTURE. 51. Relationships.—Wheat belongs to the family of true grasses (Gramineac). The Gramijieae are characterized by having hollow stems with closed joints, alternate leaves with their sheaths split open on the side opposite the blade. Wheat is included under the tribe Hordeae, in which the spikelets are one to many-flowered, sessile and alternate, thus forming a spike. (59) To this tribe belong also rye and barley, as well as the cultivated rye grasses {Lolunn pcrenne L. and L. itali- aiin Beauv.). This tribe also includes some troublesome weeds. Covich grass {Agropyron repe7is Beauv.), a perennial, was formerly included in the same genus as wheat. Because of its underground stems, or rhizomes, couch grass is difficult to eradi- cate and thus becomes a very troublesome weed in cultivated fields. Darnel {Loliinn teniu- Icninni L.) is common in wheat W^:^fWiit% fields in Europe and on the 'i^iiii^v^r^5-3^ Pacific coast in this country. A related species (L. remotam) Cross section of a grain of wheat through oCCUrS in flaX fields embryo showing tips of three rootlets before germination. (From microphoto graph by Rowlee.). 52. Roots.—When a grain of wheat germinates, it throws out a whorl of three seminal or temporary roots. The coronal or permanent roots are thrown out in whorls from the nodes. The distance between the temporary roots and the first whorl of permanent roots will depend somewhat upon the nature of the soil, but principally upon the depth of planting. The depth at. 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 Hunt, Thomas Forsyth, 1862-1927. New York, O. Judd company;
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Keywords: ., bookauthorhuntthom, bookcentury1900, bookdecade1900, bookyear1904
