. Introduction to botany. Botany. 62 Introduction to Botany. the soil are directed upward by gravity, this is by no means always the case. Certain underground shoots of the po- tato, for instance, are directed downward at various angles, and the underground shoots of the goldenrod are guided in a horizontal direction. In Sagit- taria variabilis we find an in- teresting example of somewhat diverse habits. Radiating in various directions from the parent plant (;«, Fig. 23) are hor- izontal underground shoots {g), which finally turn upward at the apices {Ii) and produce leaves above the surface.
. Introduction to botany. Botany. 62 Introduction to Botany. the soil are directed upward by gravity, this is by no means always the case. Certain underground shoots of the po- tato, for instance, are directed downward at various angles, and the underground shoots of the goldenrod are guided in a horizontal direction. In Sagit- taria variabilis we find an in- teresting example of somewhat diverse habits. Radiating in various directions from the parent plant (;«, Fig. 23) are hor- izontal underground shoots {g), which finally turn upward at the apices {Ii) and produce leaves above the surface. Roots are produced at the basal node of the upright shoots, which then become independent indi- viduals (f). Later in the season, under- ground shoots (/) are produced which grow vertically downward for about a foot, and then turn upward at their apices for a short distance and form bulbs ((?) that become filled with. Sagittaria variabilis, d, last year's tuber, from which the central plant {m) has sprung; g, off- shoots from m ; h, terminal bud of g, which has turned upward and will produce a plant like i; /, offshoot which has grown down into the mud and will produce a tuber similar to e, which is a tuber of the current season destined to survive the winter and then produce a new plant, as d has 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 Stevens, William Chase, 1861-. Boston, D. C. Heath & Co.
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