. A Manual of botany : being an introduction to the study of the structure, physiology, and classification of plants . Botany. CONVOLVULACE^. 543 corolla, and alternate with its lobes (fig. 764 e); filaments included or exserted, equal or unequal. Disk annular, hypogynous. Ovary- free, 2-4-celled, rarely by abortion 1-celled; ovules definite, erect, when more than one, collateral; style 1 (fig. 764 s), usually bifid, rarely 2 ; stigmas obtuse or acute (fig. 765). Fruit succulent or capsular (fig. 766), 1-4-celled, with septifragal and septicidal, or cir- cumscissile dehiscence. Seeds albuminou
. A Manual of botany : being an introduction to the study of the structure, physiology, and classification of plants . Botany. CONVOLVULACE^. 543 corolla, and alternate with its lobes (fig. 764 e); filaments included or exserted, equal or unequal. Disk annular, hypogynous. Ovary- free, 2-4-celled, rarely by abortion 1-celled; ovules definite, erect, when more than one, collateral; style 1 (fig. 764 s), usually bifid, rarely 2 ; stigmas obtuse or acute (fig. 765). Fruit succulent or capsular (fig. 766), 1-4-celled, with septifragal and septicidal, or cir- cumscissile dehiscence. Seeds albuminous; embryo curved or spiral (figs. 769; 598, p. 335) ; cotyledons corrugated (fig. 768) or incon- spicuous ; radicle inferior.—Herbs or shrubs, usually twining, some- times parasitical, often with a milky juice, and with alternate, un-. Fig. res. Fig. 766. Fig. 768. Fig. 769. divided or lobed, exstipulate leaves, rarely leafless. They occur chiefly in tropical and temperate regions. A few only are found in cold Figs. 762-769. Organs of fructification of Convolvulus (Calystegia) seplum, to illustrate the natural order Convolvulacese. Fig. 762. Dia^am of the flower, showing two hracte five unequal divisions of the imbricated calyx, five lobes of the plicate contorted corolla, five stamens alternating with the corolline lobes, and a quadrilocular ovary. Fig. 763. Flower bud. i. Large bracts, c. Calyx, p. Corolla. Pig. 764. Vertical section of the lower part of the flower. 6, Bracts, c, Calyx p. Tube of corolla, bearing the filaments of the stamens, e. o. Ovary, i. Style. Fig. 765. Summit of the style and stigmas. Fig. 766. Fruit, /, suiTounded by the calyx, c, and the bracts, 6, which are persistent. Fig. 767. Seed. A, Hilum. Fig. 768. Section of the seed, showing the corrugated coty- ledons. Fig. 769. Embryo Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these i
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectbotany, bookyear1875
