. Practical botany. Botany. 40 PRACTICAL BOTANY these. As the twigs grow older the green layer is shut away from the light by the corky layer outside of it and soon dies. Most of our useful annuals of the farm and garden, such as corn, potatoes, tomatoes, squashes, and so on, have green stems which do photosynthetic work. 41. The stem raises leaves into the light. Many plants which cover the ground rather closely do not need to raise them- selves much from the earth in secur- ing their share of the light. Good examples of these are such famihar ' creeping plants as white clover, black medic (M
. Practical botany. Botany. 40 PRACTICAL BOTANY these. As the twigs grow older the green layer is shut away from the light by the corky layer outside of it and soon dies. Most of our useful annuals of the farm and garden, such as corn, potatoes, tomatoes, squashes, and so on, have green stems which do photosynthetic work. 41. The stem raises leaves into the light. Many plants which cover the ground rather closely do not need to raise them- selves much from the earth in secur- ing their share of the light. Good examples of these are such famihar ' creeping plants as white clover, black medic (Medicago), moneywort (Lysi- macJi ia), and some species of wild ev- erlasting (^Ante7i- naria). But very commonly plants compete for Ught against each other, as may readily be seen in almost any cornfield. When the corn is only a little way above ground it is neces- sary to keep it free from rank, quickly growing weeds by frequent cultiva- tion. If this work. Fig. 25. Branches of Muehlenbeckia, a plant with flattened stems which do most of the photosynthetic work of the plant /, flowers; I, leaves; s, stems. One half natural size. 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; Caldwell, Otis William, 1869- joint author. Boston, New York [etc. ] Ginn and company
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