. A classification of the cultivated varieties of barley ... Barley. 408 Roy Glen Wiggans study, he found that in certain varieties these nerves were toothed or barbed, while in other varieties they were perfectly smooth (fig. 62). This character proved to be constant and reliable. As a consequence it has been used widely in Sweden in recent years in differentiating certain varieties which were similar in all readily observable characters. Some workers following Neergaard, particularly Broili (1906), have held that this character was not constant, while others have supported Neergaard. As a co
. A classification of the cultivated varieties of barley ... Barley. 408 Roy Glen Wiggans study, he found that in certain varieties these nerves were toothed or barbed, while in other varieties they were perfectly smooth (fig. 62). This character proved to be constant and reliable. As a consequence it has been used widely in Sweden in recent years in differentiating certain varieties which were similar in all readily observable characters. Some workers following Neergaard, particularly Broili (1906), have held that this character was not constant, while others have supported Neergaard. As a consequence of this doubt as to the constancy of the character, it has not been used widely by recent investigators. In the present classification it is used to make rather important divi- sions of agricultural varieties, particularly of the two-rowed sorts. In employing this char- acter, it is necessary in many cases to use a hand lens in order to be sure of the pres- ence or the absence of the barbs. The character varies in a similar manner to the. Fig. 62. VARIATION IN BARBING OF LATERAL NERVES OF LEMMA A, Smooth lateral nerves; B, barbed lateral nerves barbs on the awns. In some varieties the barbs extend along the lateral nerves nearly to the base of the kernel, while in other varieties there is a complete absence of barbs. Between these two conditions there are practically all degrees of barbing. This character, however, seems to be independent of the barbing of the awns, as some smooth-awned varieties have barbed lateral nerves and many varieties with barbed awns have smooth lateral nerves. Base of lemma The variation in the shape of the base of the lemma was first used to distinguish large groups of barleys by the Swedish investigators. They differentiated the erect compact forms from the nodding lax forms of two- rowed barleys by the character of the base. The first work on the Swedish system was begun by Atterberg (1889) and Bolin (1893). The narrow. Please note that th
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectbarley, bookyear1921
