. Essentials of botany. Botany; Botany. ECOLOGY OF LEAVES 125 146. Cutting Leaves Some grasses and sedges are generally avoided by cattle because of the sharp cutting edges of their leaves, which will readily slit the skin of one's hand if they are drawn rapidly through the fingers. Un- der the microscope the margins of Fig. 90. Euphorbia splendens. The spines are dead and dry stipules. such leaves are seen to be regularly and thickly set with sharp teeth like those of a saw (Fig. 92, c, d). 147. Offensive or Poisonous Plants. — A disgusting smell is one of the common safeguards which keep pla
. Essentials of botany. Botany; Botany. ECOLOGY OF LEAVES 125 146. Cutting Leaves Some grasses and sedges are generally avoided by cattle because of the sharp cutting edges of their leaves, which will readily slit the skin of one's hand if they are drawn rapidly through the fingers. Un- der the microscope the margins of Fig. 90. Euphorbia splendens. The spines are dead and dry stipules. such leaves are seen to be regularly and thickly set with sharp teeth like those of a saw (Fig. 92, c, d). 147. Offensive or Poisonous Plants. — A disgusting smell is one of the common safeguards which keep plants from being eaten. The dog-fennel, the hound's- tongue {Cynoglossum), the Martynia, and the tomato-plant are common examples of rank-smelling plants which are offensive to most grazing animals and so are let alone by them. Oftentimes, as in the case of the jimson -ftreed {Datura), the tobacco- plant, and the poison hemlock (Conium), the smell serves as a warning of the poi- sonous nature of the plant. A bitter, nauseating, or biting taste protects many plants from destruction by 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. Boston, Ginn
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