. Foundations of botany. Botany; Botany. BOTANTCAi GEOGBAPHY 331 trees on ascending a mountain is well shown in Fig. 234. The treeless character of the mountain summit is also plain.^ Recent experiments have shown that many ordinary- plants promptly take on alpine characteristics when they are transferred to moderate heights on mountains. For instance, a rather commonly culti- vated sunflower,^ when planted at a height of about six thousand five hun- dred feet, instead of having a tall leafy stem pro- duces a rosette of veiy hairy leaves lying close to the ground, thus be- coming almost un- re
. Foundations of botany. Botany; Botany. BOTANTCAi GEOGBAPHY 331 trees on ascending a mountain is well shown in Fig. 234. The treeless character of the mountain summit is also plain.^ Recent experiments have shown that many ordinary- plants promptly take on alpine characteristics when they are transferred to moderate heights on mountains. For instance, a rather commonly culti- vated sunflower,^ when planted at a height of about six thousand five hun- dred feet, instead of having a tall leafy stem pro- duces a rosette of veiy hairy leaves lying close to the ground, thus be- coming almost un- recognizable as a sunflower. The change was even greater than that shown in the rock rose (Fig. 235) cultivated by the same experimenter. The peculiarities of alpine plants appear to be due mainly to the intense light which they receive during the Via. 235. — Two Plants of Bock Hose (Heliamthemum). (Both drawn to tlie same scale.) A, low ground form ; £, alpine form. 1 Part of the diminution is only apparent, — the effect of distance, - growth at the highest levels is often less than waist high. ^ Helianthus tuberosus, the so-called Jerusalem artichoke. -but the. 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 Bergen, Joseph Y. (Joseph Young), 1851-1917; Eastwood, Alice, 1859-1953. Boston, Ginn & Co.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbotany, bookyear1901
