. Carnegie Institution of Washington publication. ROOT SYSTEMS OF MIXED-PRAIRIE SPECIES. 51 in texture. The tap-roots keep their dominance throughout and at a depth of 5 feet one was still 2 mm. in diameter. They reached a maximum depth of feet. No branches were given off in the first 6 to 8 inches of soil, but below this-point branches from 2 to 6 mm. in diameter arose. These seldom ran out. Fig. 20.—Meriolix serrulata. ' laterally for greater distances than a foot from the tap. They branched only poorly. The fleshy, dark-tan-colored root is kinked and curved and the smaller branches espe
. Carnegie Institution of Washington publication. ROOT SYSTEMS OF MIXED-PRAIRIE SPECIES. 51 in texture. The tap-roots keep their dominance throughout and at a depth of 5 feet one was still 2 mm. in diameter. They reached a maximum depth of feet. No branches were given off in the first 6 to 8 inches of soil, but below this-point branches from 2 to 6 mm. in diameter arose. These seldom ran out. Fig. 20.—Meriolix serrulata. ' laterally for greater distances than a foot from the tap. They branched only poorly. The fleshy, dark-tan-colored root is kinked and curved and the smaller branches especially are very brittle. Even the root-tips end abruptly with only a few branches. Figure 21 illustrates the dominance of the tap-root, paucity of small laterals, and the depth of penetration. Eriogonum annuum.—This tall, erect annual is a very common component of sandhills vegetation, frequently occurring in considerable abundance. The plants examined near Haigler, Nebraska, were 2 feet tall and just ready to blossom. It has a tap-root 3 to 5 mm. in diameter, yellowish in color, and. 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 Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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