. Elementary botany. Botany. 452 RELATION TO ENVIRONMENT. 874. The hazelnut, chestnut, and beechnut.—In these fruits a crown of leaves (involucre) at the base of the flower grows around. Fig. 474- Germinating acom of white oak. the nut and completely envelops it, forming the husk or burr. When the fruit is ripe the nut is easily shelled out from the husk. In the beechnut and chestnut the burr dehisces as it dries and allows the nut to drop out. But the fruit is not dehiscent, since the pericarp is still intact and encloses the seed. 875. The hickory-niit, walnut, and butternut.—In these fruits
. Elementary botany. Botany. 452 RELATION TO ENVIRONMENT. 874. The hazelnut, chestnut, and beechnut.—In these fruits a crown of leaves (involucre) at the base of the flower grows around. Fig. 474- Germinating acom of white oak. the nut and completely envelops it, forming the husk or burr. When the fruit is ripe the nut is easily shelled out from the husk. In the beechnut and chestnut the burr dehisces as it dries and allows the nut to drop out. But the fruit is not dehiscent, since the pericarp is still intact and encloses the seed. 875. The hickory-niit, walnut, and butternut.—In these fruits the "shuck" of the hickor\'-nut and the "hull" of the walnut and butternut are different from the involucre of the acorn or hazelnut, etc. In the hickory-nut the "shuck" probably con- sists partly of calyx and partly of involucral bracts consohdated, probaljly the calyx part predominating. This part of the fruit sphts open as it dries and frees the "nut," the pericarp being very hard and indehiscent. In the walnut and butternut the "hull" is probably of hke origin as the "shuck" of the hickory nut, but it does not split open as it ripens. It remains fleshv. The walnut and butternut are often called drupes or stone jriiifs, but the fleshy part of the fruit is not of the same origin as the fleshy part of the true drupes, like the cherry, peach, plum, etc. III. Dehiscent Fruits. 876. Of the dehiscent fruits several prominent tvpes are rec- ognized, and in general they are sometimes called pods. There is a single carpel (simple pistil), and the pericarp is dr}- (gyna-. 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
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