Identifier: bulletinofusdep601625unit (find matches)
Title: Bulletin of the U.S. Department of Agriculture
Year: 1913 (1910s)
Authors: United States. Dept. of Agriculture
Subjects: Agriculture Agriculture
Publisher: (Washington, D.C.?) : The Dept. : Supt. of Docs., G.P.O.
Contributing Library: American Museum of Natural History Library
Digitizing Sponsor: American Museum of Natural History Library

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ikelet which widens the spike on both sides of the rachis. Asa result, the spike is flattened transversely to the plane of the rachisor to the plane of the face of the spikelets (fig. 5) instead of parallelwith it, as in the case of common wheat. The awns of durum wheat are much longer than those of any varietyof common wheat. They vary in length from 1 to 2 J decimeters ormore. The long, stiff awns and the compact head give the plantmuch the appearance of barley, for which it is often mistaken bythose not familiar with the crop. The kernels of durum wheat are larger than those of common wheat(fig. 6), varying from about 7 to 10 mm. in length, with an averagelengtn of 8 to 8 J mm. As the name indicates, the kernels are veryhard, the endosperm being entirely corneous. The seed coats areunpigmented. The effect of the completely corneous endosperm andunpigmented seed coats is a kernel of a clear amber appearance,14644°—18—Bull. 618 2 10 BULLETIN 618, U. S, DEPARTMENT OF AGRICULTURE,
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Fig. 4.—Plants of four hard spring wheats, representing durum wheat and three groups of common wheat:a, Kubanka (durum); 6, Fife (Rysting); c, Preston; d, Bluestem (Haynes). EXPERIMENTS WITH DURUM WHEAT. 11

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