. British plants : their biology and ecology. Plants; Plant ecology. FRUITS AND SEEDS 187 seed, there is no reason for the pericarp to dehisce. The whole fruit is distributed as a single seed, and germinates as a seed. For this reason many achenes are popularly called seeds—, sunflower, buttercup, straw- berry-pips, corn-grains, etc. A nut is a dry indehiscent several-seeded fruit, which becomes one-seeded by abor- tion. The hazel-nut is derived from a two- chambered ovary formed of two carpels con- taining several ovules. In some cases nuts are enclosed in false envelopes developed from b
. British plants : their biology and ecology. Plants; Plant ecology. FRUITS AND SEEDS 187 seed, there is no reason for the pericarp to dehisce. The whole fruit is distributed as a single seed, and germinates as a seed. For this reason many achenes are popularly called seeds—, sunflower, buttercup, straw- berry-pips, corn-grains, etc. A nut is a dry indehiscent several-seeded fruit, which becomes one-seeded by abor- tion. The hazel-nut is derived from a two- chambered ovary formed of two carpels con- taining several ovules. In some cases nuts are enclosed in false envelopes developed from bracts—, the acorn lies in a cwpule, or cup, formed of a multitude of coalescent bracts (Fig. 84) ; the hazel is partially en- closed in a membranous cupule ; beech-nuts (mast) and edible chestnuts are enclosed, three together, in a spiny fleshy shell (Fig. 85). 2. Capsular Fruits.—These are dry, many- seeded fruits which split open to allow the seeds to escape. The dehiscence may take place in various ways : (a) By pores—, poppies, snapdragon (Fig. 86). Fig. 83.— Samara of --a Fig. 84.—Nut (Acorn) of 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 Bevis, James Frederick; Jeffery, Henry John. London : A. Rivers
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