. Elementary botany . Botany. Fig. 135.—Two carpellary flowers of Hazel in the axil of a bract (^r).. Fig. 136.—Diagram of ditto. carpels, and is syncarpous. The ovules do not develop until after the pollination of the stigma (fig. 137); consequently it is useless to look for ovules before pollination. Each chamber of the ovary (ov) then contains one ovule (o). At the base of each flower { below the insertion of the ovary) there is a little cup-like envelope ()—an involucre. It is well to note that .y^' this is not a calyx or a perianth; oy it is a collection of bracts.* Fruit. — After
. Elementary botany . Botany. Fig. 135.—Two carpellary flowers of Hazel in the axil of a bract (^r).. Fig. 136.—Diagram of ditto. carpels, and is syncarpous. The ovules do not develop until after the pollination of the stigma (fig. 137); consequently it is useless to look for ovules before pollination. Each chamber of the ovary (ov) then contains one ovule (o). At the base of each flower { below the insertion of the ovary) there is a little cup-like envelope ()—an involucre. It is well to note that .y^' this is not a calyx or a perianth; oy it is a collection of bracts.* Fruit. — After pollination the ovules are produced, but, as a rule, only one ovule in an ovary develops fully so as to form a seed. The fruit (fig. 138) is a nut containing the one seed. The involucre originally investing the base of the ovary grows vigorously and forms the green cup (fig. 139, cp) round the fruit. Seed.—The kernel of the nut is the seed; it has a thin papery testa (ts), but possesses no endosperm. The main mass of the seed is * It is impossible to explain in this book the exact method in which this involucre is formed ; but in reality it represents three joined bracts which are also prophylls. The diagram 136 explains the nature of the cupule and the inflorescence in the axil of each 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 Groom, Percy, 1865-1931. London : G. Bell
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbotany, bookyear1898
