. Our garden flowers; a popular study of their native lands, their life histories, and their structural affiliations. Flowers. COMPOSITE FAMILY of fourteen foot in my garden, where one floure was in weight three pound and two ounces, and crosse overthwart the floure by measure sixteen inches broad. —Geraed. A careful study of the great flower-head of our Garden Sunflower will make clear the structure of all the composites, since, because of its size, it shows in magnified form all the parts. The tip of the flower stem flattens out into a disk; this is the receptacle, and every. a. 4'. d. S
. Our garden flowers; a popular study of their native lands, their life histories, and their structural affiliations. Flowers. COMPOSITE FAMILY of fourteen foot in my garden, where one floure was in weight three pound and two ounces, and crosse overthwart the floure by measure sixteen inches broad. —Geraed. A careful study of the great flower-head of our Garden Sunflower will make clear the structure of all the composites, since, because of its size, it shows in magnified form all the parts. The tip of the flower stem flattens out into a disk; this is the receptacle, and every. a. 4'. d. Sunflower Blossoms. a, the bud; b, the flower shedding pollen; c, the flower with stigma receptive; d, the akene maturing. composite head has one, large or small. Around the outer rim of the circular disk, arranged as close as is convenient, are the large yellow rays; these constitute the chief beauty of the flower; it is they that attract attention. We call them petals, and so they are, but each one represents, in fact is, a separate and individual flower. In the Sunflower this outer circle of florets have lost both pistil and stamens, are corolla purely for show; but the show is worth while, for it is they who call the bees. All the other florets on the disk are small tubular-flowers crowded row on row in concentric circles; count them and you see that they number hundreds. If you observe closely you will find that by the time the large yellow rays are properly in place the outer row of tubular-florets have opened; also that the flowering impulse proceeds from the outer row toward the centre. The disk-florets of any blossoming head may be seen passing through four regular stages. In the centre are unopened buds; next come open florets, the stamens shedding pollen; then we get florets in which the stamens have 454. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these ill
Size: 2271px × 1100px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectflowers, bookyear1910
