. Botany for high schools. Botany. Fig. 7. Castor bean seeds sprouting. resembles a bean somewhat in shape. It is, however, not a true bean, but belongs to the Spurge family. At the smaller end of the seed there is a mass of spongy tissue which covers the hilum. This is called the caruncle. Its func- tion is to absorb moisture and thus provide for the passage of water through the hilum end of the seed, where it passes more readily than through the outer parts of the hard seed coats, which are smooth as if varnished, and not so absorbent as the dull more porous part of the coat which lies under
. Botany for high schools. Botany. Fig. 7. Castor bean seeds sprouting. resembles a bean somewhat in shape. It is, however, not a true bean, but belongs to the Spurge family. At the smaller end of the seed there is a mass of spongy tissue which covers the hilum. This is called the caruncle. Its func- tion is to absorb moisture and thus provide for the passage of water through the hilum end of the seed, where it passes more readily than through the outer parts of the hard seed coats, which are smooth as if varnished, and not so absorbent as the dull more porous part of the coat which lies under the caruncle. When the seed is cut open there is seen a mass of white mealy substance, the. Fig. 8. ' ^ Castor bean germinating. At right, section showing the two thin cotyledons lying between the en- 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 Atkinson, George Francis, 1854-1918. New York, H. Holt and Company
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1910
