. Botany of the living plant. Botany. APPENDIX A 539 of a naked, pitted general receptacle (gy.). W'itliin are numerous ligulate florets, which are all alike, and have the same number and relation of parts as in the Tubuliliorae. But the split ligulate corolla shows by its five teeth at the distal end that it is composed of five petals. The pollination-mechanism is founded on protandry. The elongating style sweeps out the pollen during the first stage of flowering ; the stigma then expands and is receptive during the second stage. The heads expand in sunshine, and intercrossing is possible by
. Botany of the living plant. Botany. APPENDIX A 539 of a naked, pitted general receptacle (gy.). W'itliin are numerous ligulate florets, which are all alike, and have the same number and relation of parts as in the Tubuliliorae. But the split ligulate corolla shows by its five teeth at the distal end that it is composed of five petals. The pollination-mechanism is founded on protandry. The elongating style sweeps out the pollen during the first stage of flowering ; the stigma then expands and is receptive during the second stage. The heads expand in sunshine, and intercrossing is possible by many different insects. Self-pollina- tion is also possible by the recurved stigmas coming in contact with pollen adhering to the style. It has, however, been found that in certain cases the fruit of the Dandelion can be matured without any pollination at all, even in buds from which the anthers and stigmas have been all cut away before flowering. The fruiting head is the well-known Dandelion " ; The individual fruit is a dry inferior achene or nut, attached by a long beak to the para- chute-like pappus. These fruits are easily detached by wind, being exposed on the convex growth of the receptacle, owing to the curving back of the invo- lucre (Fig. 445). They are thus scat- tered long distances by the wind. The success of the Compositae as a Family depends largely upon the certainty of each floret producing a good fruit, and on the effective dispersal of the fruit by the I'lG. 445- I'luit of DaiRk'lioii, with pappus as 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 Bower, F. O. (Frederick Orpen), 1855-1948. London, Macmillan
Size: 1160px × 2155px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1919
