. The ecological relations of roots . n great abundance all along the mainroots, run off obhquely and even almost horizontally to distances of 5 to 10inches from the base of the plant (fig. 44). Erigeron macranthus.—This plant, which is not infrequent in openings inthe forest, propagates by means of rather coarse rhizomes often about 5 diameter and several inches in length. From the base of the plant and from 102 THE ECOLOGICAL RELATIONS OF ROOTS. the rhizomes arise great clusters of fibrous roots from 3 to 4 mm. to only in diameter. While many of these run rather vertically downw
. The ecological relations of roots . n great abundance all along the mainroots, run off obhquely and even almost horizontally to distances of 5 to 10inches from the base of the plant (fig. 44). Erigeron macranthus.—This plant, which is not infrequent in openings inthe forest, propagates by means of rather coarse rhizomes often about 5 diameter and several inches in length. From the base of the plant and from 102 THE ECOLOGICAL RELATIONS OF ROOTS. the rhizomes arise great clusters of fibrous roots from 3 to 4 mm. to only in diameter. While many of these run rather vertically downward, sothat some of the longer ones reach depths of 40 inches, others spread laterallyto a distance of 14 to 18 inches and reach depths of only 4 to 12 inches. Thusthe soil for a distance of more than a foot on either side of the plant and to adepth of 2 or 3 feet is well supplied with these fibrous roots. The branchingof the root is almost identical with that of Erigeron asper (fig. 44), with whichthis species seems to
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Keywords: ., bookcentury1900, bookdecade1910, bookidecologicalre, bookyear1919
