. Elements of botany. Plants. Fig. 187. — Thorn Leaves of Barberry. grazing or browsing animals, have acquired what have with reason been called weapons for defense. Shrubs and trees not infrequently produce sharp-pointed branches, like those of the broom, Fig. 186, familiar in our own crab-apple, wild plum, and above all in the honey locust, whose formidable thorns often branch in a very complicated manner. Thorns which are really modified leaves are very perfectly exemplified in the barberry, Fig. 187. It is much commoner to find the leaf extending its midrib or its veins out into spiny poin
. Elements of botany. Plants. Fig. 187. — Thorn Leaves of Barberry. grazing or browsing animals, have acquired what have with reason been called weapons for defense. Shrubs and trees not infrequently produce sharp-pointed branches, like those of the broom, Fig. 186, familiar in our own crab-apple, wild plum, and above all in the honey locust, whose formidable thorns often branch in a very complicated manner. Thorns which are really modified leaves are very perfectly exemplified in the barberry, Fig. 187. It is much commoner to find the leaf extending its midrib or its veins out into spiny points, as the thistle does, or bearing spines or prickles 1 See Kerner and Oliver's Natural History of Plants, vol. I, p, 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; Bergen, Joseph Y. (Joseph Young), 1851-1917. Bergen's Botany: key and flora, Pacific coast ed. Boston : Ginn
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectplants, bookyear1896
