. Arthur e Fritz Kahn 1889-1932 di raccolta. Kahn, Fritz 1888-1968; Kahn, Arthur David 1850-1928; Storia Naturale illustratori; storia naturale. Quattordici specie di frumento sono mostrate le dimensioni effettive. Da sinistra a destra essi sono il Triticum aegilopoides (wild einkorn), T. monocojocum (l einkorn), T. dicoc- coides (wild emmer), T, dicoccum (farro), T. frumento (maccheroni wlieat), T. persicum (Persiano frumento), T. fur- gidum (rivetto frumento), T, polonicum (polacco di frumento), T e G, sono riconosciute nel selvaggio e cul- tivated di grani. Un altro importante diflFerence in grani è teste intheir. Cereali primitiva e molti wil

• Collaboratore: Library Book Collection / Alamy Foto Stock
• ID dell’immagine: RK1BPA
• Dimensioni dei file: 7,1 MB (437,7 KB Download compresso)
• Liberatorie: Modello - no | Proprietà - no
• Dimensioni: 1431 x 1745 px | 24,2 x 29,5 cm | 9,5 x 11,6 inches | 150dpi

Altre informazioni

Questa foto è un'immagine di pubblico dominio, il che significa che il copyright è scaduto o che il titolare del copyright ha rinunciato a tale diritto. Alamy addebita un costo per l'accesso alla copia ad alta risoluzione dell'immagine.

Questa immagine potrebbe avere delle imperfezioni perché è storica o di reportage.

. Arthur and Fritz Kahn Collection 1889-1932. Kahn, Fritz 1888-1968; Kahn, Arthur David 1850-1928; Natural history illustrators; Natural history. FOURTEEN SPECIES OF WHEAT are shown actual size. From left to right they are Triticum aegilopoides (wild einkorn), T. monocojocum (einkorn), T. dicoc- coides (wild emmer), T, dicoccum (emmer), T. durum (macaroni wlieat), T. persicum (Persian wheat), T. fur- gidum (rivet wheat), T, polonicum (Polish wheat), T. and G, are recognized in wild and cul- tivated wheats. Another important diflFerence in wheats is intheir heads. Primitive cereals and many wild grasses have heads whose central stem is brittle and fragile, break- ing apart when mature and providing a natural mechanism for seed dispersal. When such cereals are threshed, the heads break up into individual spikelets (Clusters of one or more individual grass flowers) in which the kerneis remain firmly enclosed in their husks. Under domestication this characteristic, so es- sential to perpetuation of the species in the wild, has been lost. New forms have evolved, not only in wheat but in other cereals, in which the stems are tough and the heads remain intact when ma- ture. In such cereals threshing alone re- moves the kerneis from their glumes. The cereals with free-threshing, naked grains are much more useful to man, especially for milling and baking, than those that cling stubbornly to their husks. In wheats, therefore, the naked varieties have almost completely super- seded the primitive forms. Ancestors The 7-chromosome wheats, probably the most ancient, consist of two species: T. aegilopoides and T. monococcum, known as wild einkorn and einkorn. Car- bonized kerneis of both were found at Jarmo, but whether they are the only wheats occurring in this ancient village site remains to be seen. Both species of einkorn have fragile stems and firm- hulled seeds. Their spikelets contain but a Single seed, hence their name. Each has the same set of chromosomes, genom A, and th

Parole chiave associate all'immagine

• bookcollecti
• bookcollectionamericana
• booksubjectnaturalhistory