Text Appearing Before Image: haracter. Hence we will proceed at once to adiscussion of root distribution. THE ROOT SYSTEMS OF THE GRASSES. Over 60 individuals of the four dominant grasses were excavatedand examined. Three, Koeleria cristata, Poa sandhergii, and Festucaovina ingrata, are shallow-rooted, the bulk of the absorbing systemlying above the 18-inch level, while Agropyrum spicatum penetrates toa maximum depth of 4 feet 10 inches. Agropyrum spicatum.—This is the dominant bunchgrass in eastern Wash-ington. It has its best development westward of the high upland prairiesof extreme eastern Washington and along the rim-rock through the easternpart. The bunches are often 10 inches in diameter and reach a height of over3 feet. The plant blossoms in June and dries out in early July, only to takeon renewed growth after the autumn rains and to remain green all winter. This grass has coarser roots than any of the other three important nativegrasses. These coarse, fibrous roots have many short laterals. Some of the Text Appearing After Image: THE PRAIRIES OF THE PACIFIC NORTHWEST. 33 roots reach a depth of 4 feet 10 inches, although on an average 4 feet 2 incheswas the greatest depth attained. Festuca ovina ingrata.—The blue bunchgrass ranks in importance withAgropyrum on the well-developed high prairies west of the foothills of theBitterroot Mountains between Spokane, Washington, and Lewiston, Idaho.Because of its abundance the very appropriate name Palouse (Fr. pelouse, aland clothed with a short, thick growth of herbage) was early applied to thisregion. The whole plant dries out considerably by the middle of July, but theautumn rains revive it and it is green throughout the rest of the year. Festuca ovina has a great mass of jet-black roots which occupy the soilthoroughly from the surface to a depth of about 18 inches, below which depthrelatively few roots extend. None of the roots are over 1 mm. in diameter.They branch profusely to the third order mostly, and the laterals are usuallyless than an inch in length. This
Note About Images
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 work.
Cette image est issue de la collection The Commons du site Flickr. Les organismes y partageant leur collection déclarent qu'à leur connaissance, aucune restriction de droit d'auteur ne fait obstacle à leur diffusion, pour l'une des raisons suivantes :
l'œuvre est dans le domaine public car les droits d'auteur ont expiré ;
l'œuvre a été rattachée au domaine public pour d'autres raisons, tel que le non respect des conditions nécessaires pour renouveler des droits d'auteur ;
l'organisme est détenteur des droits d'auteur mais ne ne souhaite pas exercer son contrôle ou ;
l'organisme possède des droits suffisant pour permettre à des tiers d'utiliser ces travaux sans aucune restriction.
Merci d'ajouter des bandeaux de licence supplémentaires à cette image si des informations plus spécifiques sont disponibles à propos du statut de cette image. Consultez Commons:À propos des licences pour plus d'informations.
No known copyright restrictionsNo restrictionshttps://www.flickr.com/commons/usage/false
Cette image a été originellement postée sur Flickr par Internet Archive Book Images à l'adresse https://flickr.com/photos/126377022@N07/14773450265. Elle a été passée en revue le 26 septembre 2015 par le robot FlickreviewR, qui a confirmé qu'elle se trouvait sous licence No known copyright restrictions.
26 septembre 2015
Légendes
Ajoutez en une ligne la description de ce que représente ce fichier